HomeMy WebLinkAboutFlood Insurance StudyVOLUME 1 OF 1
JEFFERSON COUNTY,
WASHINGTON
AND INCORPORATED AREAS
COMMUNITY NAME COMMUNITY NUMBER
HOH INDIAN TRIBE 530329
JEFFERSON COUNTY
UNINCORPORATED AREA 530069
CITY OF PORT TOWNSEND 530070
QUINAULT INDIAN NATION 535535
EFFECTIVE:
FLOOD INSURANCE STUDY NUMBER
53031CV000
Version Number 2.3.3.2
PRELIMINARY:
FEBRUARY 12, 2016
TABLE OF CONTENTS
Volume 1
Page
SECTION 1.0 – INTRODUCTION 1
1.1 The National Flood Insurance Program 1
1.2 Purpose of this Flood Insurance Study Report 2
1.3 Jurisdictions Included in the Flood Insurance Study Project 2
1.4 Considerations for using this Flood Insurance Study Report 5
SECTION 2.0 – FLOODPLAIN MAN AGEMENT APPLICATIONS 16
2.1 Floodplain Boundaries 16
2.2 Floodways 16
2.3 Base Flood Elevations 24
2.4 Non-Encroachment Zones 24
2.5 Coastal Flood Hazard Areas 24
2.5.1 Water Elevations and the Effects of Waves 24
2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 26
2.5.3 Coastal High Hazard Areas 27
2.5.4 Limit of Moderate Wave Action 28
SECTION 3.0 – INSURANCE APPLICATIONS 28
3.1 National Flood Insurance Program Insurance Zones 28
3.2 Coastal Barrier Resources System 29
SECTION 4.0 – AREA STUDIED 29
4.1 Basin Description 29
4.2 Principal Flood Problems 30
4.3 Non-Levee Flood Protection Measures 31
4.4 Levees 31
SECTION 5.0 – ENGINEERING METHODS 32
5.1 Hydrologic Analyses 32
5.2 Hydraulic Analyses 37
5.3 Coastal Analyses 40
5.3.1 Total Stillwater Elevations 45
5.3.2 W aves 47
5.3.3 Coastal Erosion 47
5.3.4 Wave Hazard Analyses 47
5.4 Alluvial Fan Analyses 85
SECTION 6.0 – MAPPING METHODS 85
6.1 Vertical and Horizontal Control 85
6.2 Base Map 86
6.3 Floodplain and Floodway Delineation 87
6.4 Coastal Flood Hazard Mapping 97
6.5 FIRM Revisions 98
6.5.1 Letters of Map Amendment 98
6.5.2 Letters of Map Revision Based on Fill 98
i
TABLE OF CONTENTS (continued)
Volume 1 (continued)
6.5.3 Letters of Map Revision 98
6.5.4 Physical Map Revisions 99
6.5.5 Contracted Restudies 99
6.5.6 Community Map History 99
SECTION 7.0 – CONTRACTED STUDIES AND COMMUNITY COORDINATION 101
7.1 Contracted Studies 101
7.2 Community Meetings 101
SECTION 8.0 – ADDITIONAL INFORMATION 103
SECTION 9.0 – BIBLIOGRAPHY AND REFERENCES 104
Figures
Page
Figure 1: FIRM Panel Index 7
Figure 2: FIRM Notes to Users 9
Figure 3: Map Legend for FIRM 12
Figure 4: Floodway Schematic 17
Figure 5: Wave Runup Transect Schematic 26
Figure 6: Coastal Transect Schematic 28
Figure 7: Frequency Discharge-Drainage Area Curves 34
Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 46
Figure 9: Transect Location Map 78
Tables
Page
Table 1: Listing of NFIP Jurisdictions 3
Table 2: Flooding Sources Included in this FIS Report 18
Table 3: Flood Zone Designations by Community 29
Table 4: Coastal Barrier Resources System Information 29
Table 5: Basin Characteristics 29
Table 6: Principal Flood Problems 30
Table 7: Historic Flooding Elevations 31
Table 8: Non-Levee Flood Protection Measures 31
Table 9: Levees 31
Table 10: Summary of Discharges 33
Table 11: Summary of Non-Coastal Stillwater Elevations 34
Table 12: Stream Gage Information used to Determine Discharges 35
Table 13: Summary of Hydrologic and Hydraulic Analyses 38
Table 14: Roughness Coefficients 40
Table 15: Summary of Coastal Analyses 40
Table 16: Tide Gage Analysis Specifics 47
Table 17: Coastal Transect Parameters 49
ii
TABLE OF CONTENTS (continued)
Volume 1 (continued)
Tables (continued)
Table 18: Summary of Alluvial Fan Analyses 85
Table 19: Results of Alluvial Fan Analyses 85
Table 20: Countywide Vertical Datum Conversion 86
Table 21: Stream-by-Stream Vertical Datum Conversion 86
Table 22: Base Map Sources 87
Table 23: Summary of Topographic Elevation Data used in Mapping 88
Table 24: Floodway Data 89
Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams 97
Table 26: Summary of Coastal Transect Mapping Considerations 97
Table 27: Incorporated Letters of Map Change 99
Table 28: Community Map History 100
Table 29: Summary of Contracted Studies Included in this FIS Report 101
Table 30: Community Meetings 102
Table 31: Map Repositories 103
Table 32: Additional Information 103
Table 33: Bibliography and References 105
Exhibits
Flood Profiles Panel
Big Quilcene River (Left Overbank) 01 P
Big Quilcene River (Main Channel) 02 P
Big Quilcene River (Upstream Reach) 03-04 P
Chimacum Creek 05-06 P
Dosewallips River 07-08 P
Duckabush River 09 P
Little Quilcene River 10-12 P
Marple Creek 13 P
Port Townsend Creek 14 P
Salmon Creek 15 P
Snow Creek 16 P
Published Separately
Flood Insurance Rate Map (FIRM)
iii
FLOOD INSURANCE STUDY REPORT
JEFFERSON COUNTY, WASHINGTON AND INCORPORATED AREAS
SECTION 1.0 – INTRODUCTION
1.1 The National Flood Insurance Program
The National Flood Insurance Program (NFIP) is a voluntary Federal program that enables
property owners in participating communities to purchase insurance protection against losses
from flooding. This insurance is designed to provide an alternative to disaster assistance to meet
the escalating costs of repairing damage to buildings and their contents caused by floods.
For decades, the national response to flood disasters was generally limited to constructing flood-
control works such as dams, levees, sea-walls, and the like, and providing disaster relief to flood
victims. This approach did not reduce losses nor did it discourage unwise development. In some
instances, it may have actually encouraged additional development. To compound the problem,
the public generally could not buy flood coverage from insurance companies, and building
techniques to reduce flood damage were often overlooked.
In the face of mounting flood losses and escalating costs of disaster relief to the general
taxpayers, the U.S. Congress created the NFIP. The intent was to reduce future flood damage
through community floodplain management ordinances, and provide protection for property
owners against potential losses through an insurance mechanism that requires a premium to be
paid for the protection.
The U.S. Congress established the NFIP on August 1, 1968, with the passage of the National
Flood Insurance Act of 1968. The NFIP was broadened and modified with the passage of the
Flood Disaster Protection Act of 1973 and other legislative measures. It was further modified by
the National Flood Insurance Reform Act of 1994 and the Flood Insurance Reform Act of 2004.
The NFIP is administered by the Federal Emergency Management Agency (FEMA), which is a
component of the Department of Homeland Security (DHS).
Participation in the NFIP is based on an agreement between local communities and the Federal
Government. If a community adopts and enforces floodplain management regulations to reduce
future flood risks to new construction and substantially improved structures in Special Flood
Hazard Areas (SFHAs), the Federal Government will make flood insurance available within the
community as a financial protection against flood losses. The community’s floodplain
management regulations must meet or exceed criteria established in accordance with Title 44
Code of Federal Regulations (CFR) Part 60.3, Criteria for land Management and Use.
SFHAs are delineated on the community’s Flood Insurance Rate Maps (FIRMs). Under the NFIP,
buildings that were built before the flood hazard was identified on the community’s FIRMs are
generally referred to as “Pre-FIRM” buildings. When the NFIP was created, the U.S. Congress
recognized that insurance for Pre-FIRM buildings would be prohibitively expensive if the
premiums were not subsidized by the Federal Government. Congress also recognized that most of
these floodprone buildings were built by individuals who did not have sufficient knowledge of the
flood hazard to make informed decisions. The NFIP requires that full actuarial rates reflecting the
complete flood risk be charged on all buildings constructed or substantially improved on or after
the effective date of the initial FIRM for the community or after December 31, 1974, whichever is
later. These buildings are generally referred to as “Post-FIRM” buildings.
1
1.2 Purpose of this Flood Insurance Study Report
This Flood Insurance Study (FIS) report revises and updates information on the existence and
severity of flood hazards for the study area. The studies described in this report developed flood
hazard data that will be used to establish actuarial flood insurance rates and to assist communities
in efforts to implement sound floodplain management.
In some states or communities, floodplain management criteria or regulations may exist that are
more restrictive than the minimum Federal requirements. Contact your State NFIP Coordinator to
ensure that any higher State standards are included in the community’s regulations.
1.3 Jurisdictions Included in the Flood Insurance Study Project
This FIS Report covers the entire geographic area of Jefferson County, Washington and
Incorporated Areas.
The jurisdictions that are included in this project area, along with the Community Identification
Number (CID) for each community and the 8-digit Hydrologic Unit Codes (HUC-8) sub-basins
affecting each, are shown in Table 1. The Flood Insurance Rate Map (FIRM) panel numbers that
affect each community are listed. If the flood hazard data for the community is not included in
this FIS Report, the location of that data is identified.
The location of flood hazard data for participating communities in multiple jurisdictions is also
indicated in the table.
Jurisdictions that have no identified SFHAs as of the effective date of this study are indicated in
the table. Changed conditions in these communities (such as urbanization or annexation) or the
availability of new scientific or technical data about flood hazards could make it necessary to
determine SFHAs in these jurisdictions in the future.
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5
1.4 Considerations for using this Flood Insurance Study Report
The NFIP encourages State and local governments to implement sound floodplain management
programs. To assist in this endeavor, each FIS Report provides floodplain data, which may
include a combination of the following: 10-, 4-, 2-, 1-, and 0.2-percent annual chance flood
elevations (the 1% annual chance flood elevation is also referred to as the Base Flood Elevation
(BFE)); delineations of the 1% annual chance and 0.2% annual chance floodplains; and 1%
annual chance floodway. This information is presented on the FIRM and/or in many components
of the FIS Report, including Flood Profiles, Floodway Data tables, Summary of Non-Coastal
Stillwater Elevations tables, and Coastal Transect Parameters tables (not all components may be
provided for a specific FIS).
This section presents important considerations for using the information contained in this FIS
Report and the FIRM, including changes in format and content. Figures 1, 2, and 3 present
information that applies to using the FIRM with the FIS Report.
Part or all of this FIS Report may be revised and republished at any time. In addition, part
of this FIS Report may be revised by a Letter of Map Revision (LOMR), which does not
involve republication or redistribution of the FIS Report. Refer to Section 6.5 of this FIS
Report for information about the process to revise the FIS Report and/or FIRM.
It is, therefore, the responsibility of the user to consult with community officials by
contacting the community repository to obtain the most current FIS Report components.
Communities participating in the NFIP have established repositories of flood hazard data
for floodplain management and flood insurance purposes. Community map repository
addresses are provided in Table 31, “Map Repositories,” within this FIS Report.
New FIS Reports are frequently developed for multiple communities, such as entire
counties. A countywide FIS Report incorporates previous FIS Reports for individual
communities and the unincorporated area of the county (if not jurisdictional) into a single
document and supersedes those documents for the purposes of the NFIP.
The initial Countywide FIS Report for Jefferson County became effective on TBD. Refer
to Table 28 for information about subsequent revisions to the FIRMs.
Selected FIRM panels for the community may contain information (such as floodways
and cross sections) that was previously shown separately on the corresponding Flood
Boundary and Floodway Map panels. In addition, former flood hazard zone designations
have been changed as follows:
Old Zone New Zone
A1 through A30 AE
V1 through V30
B
VE
X (shaded)
C X (unshaded)
FEMA does not impose floodplain management requirements or special insurance ratings
based on Limit of Moderate Wave Action (LiMWA) delineations at this time. The
LiMWA represents the approximate landward limit of the 1.5-foot breaking wave. If the
LiMWA is shown on the FIRM, it is being provided by FEMA as information only. For
communities that do adopt Zone VE building standards in the area defined by the
LiMWA, additional Community Rating System (CRS) credits are available. Refer to
Section 2.5.4 for additional information about the LiMWA.
The CRS is a voluntary incentive program that recognizes and encourages community
floodplain management activities that exceed the minimum NFIP requirements. Visit the
FEMA Web site at https://www.fema.gov/national-flood-insurance-program-community-
rating-system or contact your appropriate FEMA Regional Office for more information
about this program.
•Previous FIS Reports and FIRMs may have included levees that were accredited as
reducing the risk associated with the 1% annual chance flood based on the information
available and the mapping standards of the NFIP at that time. For FEMA to continue to
accredit the identified levees, the levees must meet the criteria of the Code of Federal
Regulations, Title 44, Section 65.10 (44 CFR 65.10), titled “Mapping of Areas Protected
by Levee Systems.”
Since the status of levees is subject to change at any time, the user should contact the
appropriate agency for the latest information regarding levees presented in Table 9 of this
FIS Report. For levees owned or operated by the U.S. Army Corps of Engineers
(USACE), information may be obtained from the USACE national levee database
(http://nld.usace.army.mil). For all other levees, the user is encouraged to contact the
appropriate local community.
•FEMA has developed a Guide to Flood Maps (FEMA 258) and online tutorials to assist
users in accessing the information contained on the FIRM. These include how to read
panels and step-by-step instructions to obtain specific information. To obtain this guide
and other assistance in using the FIRM, visit the FEMA Web site at
http://www.fema.gov/online-tutorial.
The FIRM Index in Figure 1 shows the overall FIRM panel layout within Jefferson
County, and also displays the panel number and effective date for each FIRM panel in
the county. Other information shown on the FIRM Index includes community
boundaries, flooding sources, watershed boundaries, and United States Geological
Survey (USGS) Hydrologic Unit Code-8 (HUC-8) codes.
6
*1650 C9/15/1981*1625 C9/15/1981*1600 C9/15/1981*1575 C9/15/1981
*1250 C9/15/1981*1225 C9/15/1981*1200 C9/15/1981
*0875 C9/15/1981*0850 C9/15/1981*0825 C9/15/1981*0800 C9/15/1981
*0075 C9/15/1981 *0100 C9/15/1981
*0025 C9/15/1981
**1665 C9/15/1981 **1670 C9/15/1981
1655 C9/15/1981 *1660 C9/15/1981
1270 C9/15/1981 1290 C9/15/1981 1295 C9/15/1981*1265 C9/15/1981 1315 C9/15/1981 1320 C9/15/1981 **1340 C9/15/1981 **1345 C9/15/1981
1260 C9/15/1981 1280 C9/15/19811255 C9/15/1981 1285 C9/15/1981 1305 C9/15/1981 1310 C9/15/1981 *1330 C9/15/1981 **1335 C9/15/1981
*0890 C9/15/1981 0895 C9/15/1981 0915 C9/15/1981 0920 C9/15/1981 0940 C9/15/1981 **0945 C9/15/1981 **0965 C9/15/1981 **0970 C9/15/1981
*0880 C9/15/1981 0885 C9/15/1981 0905 C9/15/1981 0910 C9/15/1981 0930 C9/15/1981 0935 C9/15/1981 *0955 C9/15/1981 **0960 C9/15/1981
*0440 C9/15/1981 0445 C9/15/1981 0465 C9/15/1981 0470 C9/15/1981 0490 C9/15/1981 0495 C9/15/1981 0515 C9/15/1981 **0520 C9/15/1981
*0430 C9/15/1981 0435 C9/15/1981 0455 C9/15/1981 0460 C9/15/1981 0480 C9/15/1981 0485 C9/15/1981 *0505 C9/15/1981 **0510 C9/15/1981
*0115 C9/15/1981 0120 C9/15/1981 0140 C9/15/1981
0145 C9/15/1981
0165 C9/15/1981 0170 C9/15/1981
0135 C9/15/1981
0105 C9/15/1981
0110 C9/15/1981
0130 C9/15/1981 0155 C9/15/1981 0160 C9/15/1981
0040 C9/15/1981 0045 C9/15/1981 0065 C9/15/1981 *0070 C9/15/1981
*0030 C9/15/1981 *0035 C9/15/1981
1279 C9/15/1981 1283 C9/15/1981 1284 C9/15/1981
0884 C9/15/1981 0903 C9/15/1981
0142 C9/15/1981
0107 C9/15/1981 0131 C9/15/1981 0132 C9/15/1981
0068 C9/15/1981 0069 C9/15/1981
HUC 17110019PugetSound
HUC 17100102Queets-Quinault
HUC 17110018HoodCanal
HUC 17110017Skokomish
HUC 17110020Dungeness-Elwha
HUC 17110018HoodCanal
HUC 17110020Dungeness-Elwha
HUC 171100 19PugetSound
CITY OFPORT TOWNSEND530070
JEFFERSON COUNTYUNINCORPORATED AREA530069
JEFFERSON COUNTYUNINCORPORATED AREA530069
KITSAP COUNTY
MASON COUNTY
CLALLAMCOUNTY
ISLANDCOUNTY
ISLANDCOUNTY
MASON COUNTY
Strait of Juan de Fuca
PugetSound
HoodCanal
DabobBay
HoodCanal
Duckabush R
i
v
e
r
Dosewallips River
Little Quilcene River
Thorndyke Creek
SnowCreek
Chimacum Creek
¬«116
¬«20
¬«19
¬«104
£¤101
£¤101
NATIONAL FLOOD INSURANCE PROGRAM
FLOOD INSURANCE RATE MAP INDEXJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS PRINTED:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND1C
SEPTEMBER 9, 9999
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 5 miles
0 5 102.5 Miles
0040, 0045, 0065, 0068, 0069, 0105, 0107, 0110, 0120, 0130, 0131, 0132, 0135, 0140,0142, 0145, 0155, 0160, 0165, 0170, 0225, 0435, 0445, 0455, 0460, 0465, 0470, 0480,0485, 0490, 0495, 0515, 0575, 0600, 0625, 0650, 0675, 0884, 0885, 0895, 0903, 0905,0910, 0915, 0920, 0930, 0935, 0940, 1000, 1025, 1050, 1075, 1100, 1255, 1260, 1270,1279, 1280, 1283, 1284, 1285, 1290, 1295, 1305, 1310, 1315, 1320, 1375, 1400, 1425,1450, 1475, 1655
* PANEL NOT PRINTED - NO SPECIAL FLOOD HAZARD AREAS** PANEL NOT PRINTED - AREA OUTSIDE OF COUNTY BOUNDARY
Figure 1: FIRM Panel Index
*1550 C9/15/1981*1525 C9/15/1981*1500 C9/15/19811475 C9/15/19811450 C9/15/19811425 C9/15/19811400 C9/15/19811375 C9/15/1981
*1175 C9/15/1981*1150 C9/15/1981*1125 C9/15/19811100 C9/15/19811075 C9/15/19811050 C9/15/19811025 C9/15/19811000 C9/15/1981
*0775 C9/15/1981*0750 C9/15/1981*0725 C9/15/1981*0700 C9/15/19810675 C9/15/19810650 C9/15/19810625 C9/15/19810600 C9/15/19810575 C9/15/1981*0550 C9/15/1981
*0425 C9/15/1981*0400 C9/15/1981*0375 C9/15/1981*0350 C9/15/1981*0325 C9/15/1981*0300 C9/15/1981*0275 C9/15/1981*0250 C9/15/1981*0225 C9/15/1981*0200 C9/15/1981
HUC 17100101Hoh-Quillayute HUC 17110020Dungeness-Elwha
HUC 17100102Queets-Quinault
HUC 17100101Hoh-Quillayute
HUC 17110017Skokomish
HUC 17100104LowerChehalis
HUC 17100105GraysHarbor
QUINAULT INDIAN NATION535535
HOH INDIAN TRIBE530329
QUINAULT INDIAN NATION535535
PacificOcean
PacificOcean
JEFFERSON COUNTYUNINCORPORATED AREA530069Clearwater River
Queets River
Hoh River
Bogachiel River
GRAYS HARBOR COUNTY
MASON COUNTY
CLALLAMCOUNTY
¬«101
¬«101
NATIONAL FLOOD INSURANCE PROGRAM
FLOOD INSURANCE RATE MAP INDEXJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS PRINTED:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND2C
SEPTEMBER 9, 9999
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 6 miles
0 5 102.5 Miles
0200, 0225, 0250, 0275, 0300, 0325, 0350, 0375, 0400, 0425, 0550, 0575, 0600, 0625,0650, 0675, 0700, 0725, 0750, 0775, 1000, 1025, 1050, 1075, 1100, 1125, 1150, 1175,1375, 1400, 1425, 1450, 1475, 1500, 1525, 1550
* PANEL NOT PRINTED - NO SPECIAL FLOOD HAZARD AREAS
Figure 1: FIRM Panel Index (continued)
Figure 2: FIRM Notes to Users
NOTES TO USERS
For information and questions about this map, available products associated with this FIRM
including historic versions of this FIRM, how to order products, or the National Flood
Insurance Program in general, please call the FEMA Map Information eXchange at 1-877-
FEMA-MAP (1-877-336-2627) or visit the FEMA Map Service Center website at
http://msc.fema.gov. Available products may include previously issued Letters of Map
Change, a Flood Insurance Study Report, and/or digital versions of this map. Many of these
products can be ordered or obtained directly from the website. Users may determine the
current map date for each FIRM panel by visiting the FEMA Map Service Center website or
by calling the FEMA Map Information eXchange.
Communities annexing land on adjacent FIRM panels must obtain a current copy of the
adjacent panel as well as the current FIRM Index. These may be ordered directly from the
Flood Map Service Center at the number listed above.
For community and countywide map dates, refer to Table 28 in this FIS Report.
To determine if flood insurance is available in the community, contact your insurance agent or
call the National Flood Insurance Program at 1-800-638-6620.
The map is for use in administering the NFIP. It may not identify all areas subject to flooding,
particularly from local drainage sources of small size. Consult the community map repository
to find updated or additional flood hazard information.
BASE FLOOD ELEVATIONS: For more detailed information in areas where Base Flood
Elevations (BFEs) and/or floodways have been determined, consult the Flood Profiles and
Floodway Data and/or Summary of Non-Coastal Stillwater Elevations tables within this FIS
Report. Use the flood elevation data within the FIS Report in conjunction with the FIRM for
construction and/or floodplain management.
Coastal Base Flood Elevations shown on the map apply only landward of 0.0' North American
Vertical Datum of 1988 (NAVD88). Coastal flood elevations are also provided in the Coastal
Transect Parameters table in the FIS Report for this jurisdiction. Elevations shown in the
Summary of Stillwater Elevations table should be used for construction and/or floodplain
management purposes when they are higher than the elevations shown on the FIRM.
FLOODWAY INFORMATION: Boundaries of the floodways were computed at cross sections
and interpolated between cross sections. The floodways were based on hydraulic
considerations with regard to requirements of the National Flood Insurance Program.
Floodway widths and other pertinent floodway data are provided in the FIS Report for this
jurisdiction.
9
Figure 2. FIRM Notes to Users (continued)
FLOOD CONTROL STRUCTURE INFORMATION: Certain areas not in Special Flood
Hazard Areas may be protected by flood control structures. Refer to Section 4.3 "Non-Levee
Flood Protection Measures" of this FIS Report for information on flood control structures for
this jurisdiction.
PROJECTION INFORMATION: The projection used in the preparation of the map was
Universal Transverse Mercator (UTM) Zone 10. The horizontal datum was North American
Datum 1983 (NAD83). Differences in datum, spheroid, projection or State Plane zones used
in the production of FIRMs for adjacent jurisdictions may result in slight positional differences
in map features across jurisdiction boundaries. These differences do not affect the accuracy
of the FIRM.
ELEVATION DATUM: Flood elevations on the FIRM are referenced to North American
Vertical Datum of 1988 (NAVD88). These flood elevations must be compared to structure and
ground elevations referenced to the same vertical datum. For information regarding
conversion between the National Geodetic Vertical Datum of 1929 (NGVD29) and NAVD88,
visit the National Geodetic Survey website at http://www.ngs.noaa.gov/ or contact the
National Geodetic Survey at the following address:
NGS Information Services
NOAA, N/NGS12
National Geodetic Survey
SSMC-3, #9202
1315 East-West Highway
Silver Spring, Maryland 20910-3282
(301) 713-3242
Local vertical monuments may have been used to create the map. To obtain current
monument information, please contact the appropriate local community listed in Table 31 of
this FIS Report.
BASE MAP INFORMATION: Base map information shown on the FIRM was provided by
Jefferson County GIS Department at a scale of 1:5,000. The following panels used base map
information provided by the U.S. Geological Survey at a scale of 1:12,000: 125, 130, and
140. For information about base maps, refer to Section 6.2 “Base Map” in this FIS Report.
The map reflects more detailed and up-to-date stream channel configurations than those
shown on the previous FIRM for this jurisdiction. The floodplains and floodways that were
transferred from the previous FIRM may have been adjusted to conform to these new stream
channel configurations. As a result, the Flood Profiles and Floodway Data tables may reflect
stream channel distances that differ from what is shown on the map.
Corporate limits shown on the map are based on the best data available at the time of
publication. Because changes due to annexations or de-annexations may have occurred after
the map was published, map users should contact appropriate community officials to verify
current corporate limit locations.
NOTES FOR FIRM INDEX
REVISIONS TO INDEX: As new studies are performed and FIRM panels are updated within
Jefferson County, Washington and Incorporated Areas, corresponding revisions to the FIRM
Index will be incorporated within the FIS Report to reflect the effective dates of those panels.
Please refer to Table 28 of this FIS Report to determine the most recent FIRM revision date
for each community. The most recent FIRM panel effective date will correspond to the most
recent index date.
10
Figure 2. FIRM Notes to Users (continued)
SPECIAL NOTES FOR SPECIFIC FIRM PANELS
This section is not applicable to this flood Risk Project.
FLOOD RISK REPORT: A Flood Risk Report (FRR) may be available for many of the flooding
sources and communities referenced in this FIS Report. The FRR is provided to increase
public awareness of flood risk by helping communities identify the areas within their
jurisdictions that have the greatest risks. Although non-regulatory, the information provided
within the FRR can assist communities in assessing and evaluating mitigation opportunities to
reduce these risks. It can also be used by communities developing or updating flood risk
mitigation plans. These plans allow communities to identify and evaluate opportunities to
reduce potential loss of life and property. However, the FRR is not intended to be the final
authoritative source of all flood risk data for a project area; rather, it should be used with other
data sources to paint a comprehensive picture of flood risk.
11
Figure 3: Map Legend for FIRM
SPECIAL FLOOD HAZARD AREAS: The 1% annual chance flood, also known as the base flood or
100-year flood, has a 1% chance of happening or being exceeded each year. Special Flood Hazard
Areas are subject to flooding by the 1% annual chance flood. The Base Flood Elevation is the water-
surface elevation of the 1% annual chance flood. The floodway is the channel of a stream plus any
adjacent floodplain areas that must be kept free of encroachment so that the 1% annual chance flood
can be carried without substantial increases in flood heights. See note for specific types. If the
floodway is too narrow to be shown, a note is shown.
Special Flood Hazard Areas subject to inundation by the 1% annual
chance flood (Zones A, AE, AH, AO, AR, A99, V and VE)
Zone A The flood insurance rate zone that corresponds to the 1% annual chance
floodplains. No base (1% annual chance) flood elevations (BFEs) or
depths are shown within this zone.
Zone AE The flood insurance rate zone that corresponds to the 1% annual chance
floodplains. Base flood elevations derived from the hydraulic analyses are
shown within this zone.
Zone AH The flood insurance rate zone that corresponds to the areas of 1% annual
chance shallow flooding (usually areas of ponding) where average depths
are between 1 and 3 feet. Whole-foot BFEs derived from the hydraulic
analyses are shown at selected intervals within this zone.
Zone AO The flood insurance rate zone that corresponds to the areas of 1%
annual chance shallow flooding (usually sheet flow on sloping terrain)
where average depths are between 1 and 3 feet. Average whole-foot
depths derived from the hydraulic analyses are shown within this zone.
Zone AR The flood insurance rate zone that corresponds to areas that were
formerly protected from the 1% annual chance flood by a flood control
system that was subsequently decertified. Zone AR indicates that the
former flood control system is being restored to provide protection from
the 1% annual chance or greater flood.
Zone A99 The flood insurance rate zone that corresponds to areas of the 1%
annual chance floodplain that will be protected by a Federal flood
protection system where construction has reached specified statutory
milestones. No base flood elevations or flood depths are shown within
this zone.
Zone V The flood insurance rate zone that corresponds to the 1% annual chance
coastal floodplains that have additional hazards associated with storm
waves. Base flood elevations are not shown within this zone.
Zone VE Zone VE is the flood insurance rate zone that corresponds to the 1%
annual chance coastal floodplains that have additional hazards
associated with storm waves. Base flood elevations derived from the
coastal analyses are shown within this zone as static whole-foot
elevations that apply throughout the zone.
Regulatory Floodway determined in Zone AE.
12
Figure 3: Map Legend for FIRM (continued)
OTHER AREAS OF FLOOD HAZARD
Shaded Zone X: Areas of 0.2% annual chance flood hazards and areas
of 1% annual chance flood hazards with average depths of less than 1
foot or with drainage areas less than 1 square mile.
Future Conditions 1% Annual Chance Flood Hazard – Zone X: The flood
insurance rate zone that corresponds to the 1% annual chance
floodplains that are determined based on future-conditions hydrology. No
base flood elevations or flood depths are shown within this zone.
Area with Reduced Flood Risk due to Levee: Areas where an accredited
levee, dike, or other flood control structure has reduced the flood risk
from the 1% annual chance flood. See Notes to Users for important
information.
OTHER AREAS
Zone D (Areas of Undetermined Flood Hazard): The flood insurance rate
zone that corresponds to unstudied areas where flood hazards are
undetermined, but possible
Unshaded Zone X: Areas of minimal flood hazard.
FLOOD HAZARD AND OTHER BOUNDARY LINES
(ortho) (vector)
Flood Zone Boundary (white line on ortho-photography-based mapping;
gray line on vector-based mapping)
Limit of Study
Jurisdiction Boundary
Limit of Moderate Wave Action (LiMWA): Indicates the inland limit of the
area affected by waves greater than 1.5 feet
GENERAL STRUCTURES
Aqueduct
Channel
Culvert
Storm Sewer
Channel, Culvert, Aqueduct, or Storm Sewer
__________
Dam
Jetty
Weir Dam, Jetty, Weir
Levee, Dike, or Floodwall
Bridge Bridge
NO SCREEN
13
Figure 3: Map Legend for FIRM (continued)
COASTAL BARRIER RESOURCES SYSTEM (CBRS) AND OTHERWISE PROTECTED AREAS
(OPA): CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard
Areas. See Notes to Users for important information.
CBRS AREA
09/30/2009
Coastal Barrier Resources System Area: Labels are shown to clarify
where this area shares a boundary with an incorporated area or overlaps
with the floodway.
OTHERWISE
PROTECTED AREA
09/30/2009
Otherwise Protected Area
REFERENCE MARKERS
River mile Markers
CROSS SECTION & TRANSECT INFORMATION
Lettered Cross Section with Regulatory Water Surface Elevation (BFE)
Numbered Cross Section with Regulatory Water Surface Elevation (BFE)
Unlettered Cross Section with Regulatory Water Surface Elevation (BFE)
Coastal Transect
Profile Baseline: Indicates the modeled flow path of a stream and is
shown on FIRM panels for all valid studies with profiles or otherwise
established base flood elevation.
Coastal Transect Baseline: Used in the coastal flood hazard model to
represent the 0.0-foot elevation contour and the starting point for the
transect and the measuring point for the coastal mapping.
Base Flood Elevation
ZONE AE
(EL 16) Static Base Flood Elevation value (shown under zone label)
ZONE AO
(DEPTH 2) Zone designation with Depth
ZONE AO
(DEPTH 2)
(VEL 15 FPS)
Zone designation with Depth and Velocit y
14
Figure 3: Map Legend for FIRM (continued)
BASE MAP FEATURES
Missouri Creek River, Stream or Other Hydrographic Feature
Interstate Highway
U.S. Highway
State Highway
County Highway
MAPLE LANE Street, Road, Avenue Name, or Private Drive if shown on Flood Profile
RAILROAD Railroad
Horizontal Reference Grid Line
Horizontal Reference Grid Ticks
Secondary Grid Crosshairs
Land Grant Name of Land Grant
7 Section Number
R. 43 W. T. 22 N.Range, Township Number
4276000mE Horizontal Reference Grid Coordinates (UTM)
365000 FT Horizontal Reference Grid Coordinates (State Plane)
80° 16’ 52.5”Corner Coordinates (Latitude, Longitude)
15
SECTION 2.0 – FLOODPLAIN MANAGEMENT APPLICATIONS
2.1 Floodplain Boundaries
To provide a national standard without regional discrimination, the 1% annual chance (100-year)
flood has been adopted by FEMA as the base flood for floodplain management purposes. The
0.2% annual chance (500-year) flood is employed to indicate additional areas of flood hazard in
the community.
Each flooding source included in the project scope has been studied and mapped using
professional engineering and mapping methodologies that were agreed upon by FEMA and
Jefferson County as appropriate to the risk level. Flood risk is evaluated based on factors such as
known flood hazards and projected impact on the built environment. Engineering analyses were
performed for each studied flooding source to calculate its 1% annual chance flood elevations;
elevations corresponding to other floods (e.g. 10-, 4-, 2-, 0.2-percent annual chance, etc.) may
have also been computed for certain flooding sources. Engineering models and methods are
described in detail in Section 5.0 of this FIS Report. The modeled elevations at cross sections
were used to delineate the floodplain boundaries on the FIRM; between cross sections, the
boundaries were interpolated using elevation data from various sources. More information on
specific mapping methods is provided in Section 6.0 of this FIS Report.
Depending on the accuracy of available topographic data (Table 23), study methodologies
employed (Section 5.0), and flood risk, certain flooding sources may be mapped to show both the
1% and 0.2% annual chance floodplain boundaries, regulatory water surface elevations (BFEs),
and/or a regulatory floodway. Similarly, other flooding sources may be mapped to show only the
1% annual chance floodplain boundary on the FIRM, without published water surface elevations.
In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the
1% annual chance floodplain boundary is shown on the FIRM. Figure 3, “Map Legend for
FIRM”, describes the flood zones that are used on the FIRMs to account for the varying levels of
flood risk that exist along flooding sources within the project area. Table 2 and Table 3 indicate
the flood zone designations for each flooding source and each community within
Jefferson County , Washington, respectively.
Table 2, “Flooding Sources Included in this FIS Report,” lists each flooding source, including its
study limits, affected communities, mapped zone on the FIRM, and the completion date of its
engineering analysis from which the flood elevations on the FIRM and in the FIS Report were
derived. Descriptions and dates for the latest hydrologic and hydraulic analyses of the flooding
sources are shown in Table 13. Floodplain boundaries for these flooding sources are shown on
the FIRM (published separately) using the symbology described in Figure 3. On the map, the
1% annual chance floodplain corresponds to the SFHAs. The 0.2% annual chance floodplain
shows areas that, although out of the regulatory floodplain, are still subject to flood hazards.
Small areas within the floodplain boundaries may lie above the flood elevations but cannot be
shown due to limitations of the map scale and/or lack of detailed topographic data. The
procedures to remove these areas from the SFHA are described in Section 6.5 of this FIS Report.
2.2 Floodways
Encroachment on floodplains, such as structures and fill, reduces flood-carrying capacity,
increases flood heights and velocities, and increases flood hazards in areas beyond the
16
encroachment itself. One aspect of floodplain management involves balancing the economic gain
from floodplain development against the resulting increase in flood hazard.
For purposes of the NFIP, a floodway is used as a tool to assist local communities in balancing
floodplain development against increasing flood hazard. With this approach, the area of the 1%
annual chance floodplain on a river is divided into a floodway and a floodway fringe based on
hydraulic modeling. The floodway is the channel of a stream, plus any adjacent floodplain areas,
that must be kept free of encroachment in order to carry the 1% annual chance flood. The
floodway fringe is the area between the floodway and the 1% annual chance floodplain
boundaries where encroachment is permitted. The floodway must be wide enough so that the
floodway fringe could be completely obstructed without increasing the water-surface elevation of
the 1% annual chance flood more than 1 foot at any point. Typical relationships between the
floodway and the floodway fringe and their significance to floodplain development are shown in
Figure 4.
To participate in the NFIP, Federal regulations require communities to limit increases caused by
encroachment to 1.0 foot, provided that hazardous velocities are not produced. Regulations
for State require communities in Jefferson County to limit increases caused by encroachment to
0.5 foot and several communities have adopted additional restrictions. The floodways in this
project are presented to local agencies as minimum standards that can be adopted directly or that
can be used as a basis for additional floodway projects.
Figure 4: Floodway Schematic
LINE AB IS THE FLOOD ELEVATION BEFORE ENCROACHMENT.
LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT.
*SURCHARGE IS NOT TO EXCEED 1.0 FOOT (FEMA REQUIREMENT) OR LESS AMOUNT IF SPECIFIED BY STATE OR COMMUNITY.
17
Table 2: Flooding Sources Included in this FIS Report
Flooding Source Community Downstream Limit Upstream Limit
HUC-8
Sub-
Basin(s)
Length (mi)
(streams or
coastlines)
Area (mi2)
(estuaries
or ponding)
Floodway
(Y/N)
Zone
shown
on FIRM
Date of
Analysis
Admiralty Inlet City of Port
Townsend
Entrance to Admiralty
Inlet at Point Wilson Point Hudson 17100019 2.5 N AE,VE 06/09/15
Admiralty Inlet
Jefferson County
Unincorporated
Area
Kinney Point
Entrance to Kilisut
Harbor along
Marrowstone
Island
17100019 11.1 N AE,VE
06/09/15
Admiralty Inlet
Jefferson County
Unincorporated
Area
Olele Point Entrance to Mats
Mats Bay 17100019 0.7 N AE,VE
06/09/15
Admiralty Inlet
Jefferson County
Unincorporated
Area
Entrance to Mats Bay
Approximately
3,500' Port Ludlow
Marina
17100019 2.7 N AE,VE
06/09/15
Big Quilcene
River (Main
Channel)
Jefferson County
Unincorporated
Area
The confluence of
Quilcene Bay
Approximately 56’
above Rodgers
Street
17100018 0.9 Y AE,A
06/09/15
Big Quilcene
River (Left
Overbank)
Jefferson County
Unincorporated
Area
Approximately 3,120’
above Quilcene Bay
Approximately
120’ above
Chimacum Road
17100018 0.2 Y AE,A
06/09/15
Big Quilcene
River (Upstream
Reach)
Jefferson County
Unincorporated
Area
The confluence of Big
Quilcene River (Main
Channel)
Approximately 1.5
miles above U.S.
Highway 101
17100018 3.5 Y AE,A
06/09/15
Bywater Bay
Jefferson County
Unincorporated
Area
The Southern end of
Hood Head
The Southwest
entrance to
Bywater Bay
17100019 1.8 N AE,A
06/09/15
Chimacum Creek
Jefferson County
Unincorporated
Area
Approximately 2,500’
above Puget Sound Rhody Drive 17100019 4.1 Y AE, A
06/09/15
18
Table 2: Flooding Sources Included in this FIS Report (continued)
Flooding Source Community Downstream Limit Upstream Limit
HUC-8
Sub-
Basin(s)
Length (mi)
(streams or
coastlines)
Area (mi2)
(estuaries
or ponding)
Floodway
(Y/N)
Zone
shown
on FIRM
Date of
Analysis
Dabob Bay
Jefferson County
Unincorporated
Area
Frenchmans Point Pulali Point 17100019 3.7 N AE,VE
06/09/15
Dabob Bay
Jefferson County
Unincorporated
Area
The Southwestern
limit of Right Smart
Cove
The Northern end
of Dosewallips
Mudflats
17100019 2.9 N AE,VE
06/09/15
Dabob Bay
Jefferson County
Unincorporated
Area
Tskutsko Point Fisherman Point 17100019 21.0 N AE,VE
06/09/15
Dabob Bay
Jefferson County
Unincorporated
Area
Wawa Point
Approximately
800' west of Wawa
Point
17100019 0.2 N AE,VE
06/09/15
Discovery Bay
Jefferson County
Unincorporated
Area
County boundary at
the mouth of Eagle
Creek
Strait of Juan de
Fuca coastline at
Cape George
17100020 21.5 N AE,VE
06/09/15
Dosewallips River
Jefferson County
Unincorporated
Area
Approximately 1,200’
above the confluence
of Hood Canal
Approximately 3.1
miles above U.S.
Highway 101
17100018 3.9 Y AE, A
06/09/15
Duckabush River
Jefferson County
Unincorporated
Area
Approximately 3,000’
above the confluence
of Hood Canal
Approximately
12,900’ above the
confluence of
Hood Canal
17100018 2.4 Y AE,A
06/09/15
Glen Cove
Jefferson County
Unincorporated
Area
Port Townsend Paper
Corporation
Approximate
southern limit of
Glen Cove
17100019 1.1 N
06/09/15
Hood Canal
Jefferson County
Unincorporated
Area
Entrance to Bywater
Bay
The Northern
entrance to
Squamish Harbor
17100018 1.7 N AE,VE
06/09/15
19
A
Table 2: Flooding Sources Included in this FIS Report (continued)
Flooding Source Community Downstream Limit Upstream Limit
HUC-8
Sub-
Basin(s)
Length (mi)
(streams or
coastlines)
Area (mi2)
(estuaries
or ponding)
Floodway
(Y/N)
Zone
shown
on FIRM
Date of
Analysis
Hood Canal
Jefferson County
Unincorporated
Area
Case Shoal
At the
northeastern limit
of Thorndyke Bay
17100018 5.1 N AE,VE
06/09/15
Hood Canal
Jefferson County
Unincorporated
Area
The Northern end of
Dosewallips Mudflats
The Jefferson
County boundary
along Hood Canal
17100018 13.9 N AE,VE
06/09/15
Hood Canal
Jefferson County
Unincorporated
Area
Tala Point The Southern end
of Hood Head 17100018 6.6 N AE,VE
06/09/15
Hood Canal
Jefferson County
Unincorporated
Area
The southern limit of
Thorndyke Bay Tskutsko Point 17100018 13.0 N AE,VE
06/09/15
Jackson Cove
Jefferson County
Unincorporated
Area
Pulali Point Wawa Point 17100019 2.6 N AE,VE
06/09/15
Kilisut Harbor
Jefferson County
Unincorporated
Area
Entrance to Kilisut
Harbor along Indian
Island
Bishops Point 17100019 4.1 N AE
06/09/15
Kilisut Harbor
Jefferson County
Unincorporated
Area
The Northern part of
the inlet to Mystery
Bay
Entrance to Kilisut
Harbor 17100019 3.6 N AE
06/09/15
Kilisut Harbor
Jefferson County
Unincorporated
Area
The approximate
northeastern limit of
Scow Bay
Griffiths Point 17100019 1.6 N AE,A
06/09/15
Little Quilcene
River
Jefferson County
Unincorporated
Area
Approximately 1,450’
above the confluence
of Quilcene Bay
Approximately
6,600’ above U.S.
Highway 101
17100018 3.1 Y AE,A
06/09/15
Marple Creek
Jefferson County
Unincorporated
Area
Approximately 200’
above the confluence
of Hood Canal
Approximately
1,600’ above U.S.
Highway 101
17100101 0.5 Y AE,A
06/09/15
20
Table 2: Flooding Sources Included in this FIS Report (continued)
Flooding Source Community Downstream Limit Upstream Limit
HUC-8
Sub-
Basin(s)
Length (mi)
(streams or
coastlines)
Area (mi2)
(estuaries
or ponding)
Floodway
(Y/N)
Zone
shown
on FIRM
Date of
Analysis
Mats Mats Bay
Jefferson County
Unincorporated
Area
The northern
entrance to Mats
Mats Bay
The southern
entrance to Mats
Mats Bay
17100019 3.1 N AE
06/09/15
Mystery Bay
Jefferson County
Unincorporated
Area
The northern most
location on Griffiths
Point
The northern part
of the inlet to
Mystery Bay
17100018 1.4 N AE
06/09/15
Oak Bay
Jefferson County
Unincorporated
Area
The southern limit of
Portage Canal Indian
Island
Kinney Point 17100019 2.7 N AE
06/09/15
Oak Bay
Jefferson County
Unincorporated
Area
The southwestern
limit of Portage Canal Olele Point 17100019 5.4 N AE,VE
06/09/15
Pacific Ocean
Jefferson County
Unincorporated
Area
The northern limit of
the erodibale dune
field on the spit north
of the mouth of the
Queets River.
The northern
county boundary
along the Pacific
Ocean
17100102 33.8 N VE
06/09/15
Pacific Ocean
Jefferson County
Unincorporated
Area
The southern county
boundary along the
Pacific Ocean
The northern limit
of the erodibale
dune field
17100102 1.5 N VE
06/09/15
Port Ludlow Bay
Jefferson County
Unincorporated
Area
Approximately 3,500'
the entrance to Port
Ludlow Marina
Tala Point 17100019 5.9 N AE
06/09/15
Port Townsend
Bay
Jefferson County
Unincorporated
Area
Approximate
southern limit of Glen
Cove
The northwestern
limit of Portage
Canal
17100019 6.0 N AE
06/09/15
Port Townsend
Bay
Jefferson County
Unincorporated
Area
The northeastern
entrance to Portage
Canal
Entrance to Kilisut
Harbor 17100019 5.3 N AE
06/09/15
21
Table 2: Flooding Sources Included in this FIS Report (continued)
Flooding Source Community Downstream Limit Upstream Limit
HUC-8
Sub-
Basin(s)
Length (mi)
(streams or
coastlines)
Area (mi2)
(estuaries
or ponding)
Floodway
(Y/N)
Zone
shown
on FIRM
Date of
Analysis
Port Townsend
Bay
City of Port
Townsend ,
Jefferson County
Unincorporated
Area
Point Hudson
The Glen
Cove/Port
Townsend Paper
Corporation
17100019 4.8 N VE
06/09/15
Port Townsend
Creek
Jefferson County
Unincorporated
Area
Approximately 700'
above the confluence
of Discovery Bay
Discovery Road 17100019 1.0 N AE
06/09/15
Portage Canal
Jefferson County
Unincorporated
Area
The northeastern
entrance to Portage
Canal along Indian
Island
The southern limit
of Portage Canal
Indian Island
17100019 1.0 N AE
06/09/15
Portage Canal
Jefferson County
Unincorporated
Area
The northwestern
limit of the canal
The southwestern
limit of the canal 17100019 0.9 N AE
06/09/15
Puget Sound
City of Port
Townsend ,
Jefferson County
Unincorporated
Area
Entire Shoreland Entire Shoreland 17100019 N AE, VE
06/09/15
Quilcene Bay
Jefferson County
Unincorporated
Area
Fisherman Point Frenchmans Point 17100019 6.5 N AE
06/09/15
Right Smart Cove
Jefferson County
Unincorporated
Area
Approximately 800'
west of Wawa Point
The southwestern
limit of Right
Smart Cove
17100019 0.6 N AE, VE
06/09/15
Salmon Creek
Jefferson County
Unincorporated
Area
The confluence of
Discovery Bay West Uncas Road 17100102 1.1 Y AE,A
06/09/15
22
Table 2: Flooding Sources Included in this FIS Report (continued)
Flooding Source Community Downstream Limit Upstream Limit
HUC-8
Sub-
Basin(s)
Length (mi)
(streams or
coastlines)
Area (mi2)
(estuaries
or ponding)
Floodway
(Y/N)
Zone
shown
on FIRM
Date of
Analysis
Scow Bay
Jefferson County
Unincorporated
Area
Bishops Point
The approximate
northeastern limit
of Scow Bay
17100019 3.7 N AE
06/09/15
Snow Creek
Jefferson County
Unincorporated
Area
The confluence of
Salmon Creek
Approximately
2,200’ upstream of
the confluence of
Salmon Creek
17100020 0.4 Y AE,A
06/09/15
Squamish Harbor
Jefferson County
Unincorporated
Area
The approximate
eastern limit of
Squamish Harbor
Case Shoal 17100019 3.8 N AE,VE
06/09/15
Strait of Juan de
Fuca
City of Port
Townsend ,
Jefferson County
Unincorporated
Area
Entrance to
Discovery Bay at
Cape George
Entrance to
Admiralty Inlet at
Point Wilson
17100019 8.0 N VE
06/09/15
Strait of Juan de
Fuca
Jefferson County
Unincorporated
Area
The west end of
Protection Island
The east end of
Protection Island 17100019 5.5 N AE
06/09/15
Thorndyke Bay
Jefferson County
Unincorporated
Area
The northeastern limit
of Thorndyke Bay
The southern limit
of Thorndyke Bay 17100019 1.9 N AE,VE
06/09/15
23
Floodway widths presented in this FIS Report and on the FIRM were computed at cross sections.
Between cross sections, the floodway boundaries were interpolated. For certain stream segments,
floodways were adjusted so that the amount of floodwaters conveyed on each side of the
floodplain would be reduced equally. The results of the floodway computations have
been tabulated for selected cross sections and are shown in Table 24, “Floodway Data.”
All floodways that were developed for this FIS project are shown on the FIRM using the
symbology described in Figure 3. In cases where the floodway and l% annual chance floodplain
boundaries are either close together or collinear, only the floodway boundary has been shown on
the FIRM. For information about the delineation of floodways on the FIRM, refer to Section 6.3.
2.3 Base Flood Elevations
The hydraulic characteristics of flooding sources were analyzed to provide estimates of the
elevations of floods of the selected recurrence intervals. The Base Flood Elevation (BFE) is the
elevation of the 1% annual chance flood. These BFEs are most commonly rounded to the whole
foot, as shown on the FIRM, but in certain circumstances or locations they may be rounded to 0.1
foot. Cross section lines shown on the FIRM may also be labeled with the BFE rounded to 0.1
foot. Whole-foot BFEs derived from engineering analyses that apply to coastal areas, areas of
ponding, or other static areas with little elevation change may also be shown at selected intervals
on the FIRM.
Cross sections with BFEs shown on the FIRM correspond to the cross sections shown in the
Floodway Data table and Flood Profiles in this FIS Report. BFEs are primarily intended for flood
insurance rating purposes. For construction and/or floodplain management purposes, users are
cautioned to use the flood elevation data presented in this FIS Report in conjunction with the data
shown on the FIRM.
2.4 Non-Encroachment Zones
Some States and communities use non-encroachment zones to manage floodplain development.
While not a FEMA designated floodway, the non-encroachment zone represents that area around
the stream that should be reserved to convey the 1% annual chance flood event.
2.5 Coastal Flood Hazard Areas
For most areas along rivers, streams, and small lakes, BFEs and floodplain boundaries are based
on the amount of water expected to enter the area during a 1% annual chance flood and the
geometry of the floodplain. Floods in these areas are typically caused by storm events. However,
for areas on or near ocean coasts, large rivers, or large bodies of water, BFE and floodplain
boundaries may need to be based on additional components, including storm surges and waves.
Communities on or near ocean coasts face flood hazards caused by offshore seismic events as
well as storm events.
Coastal flooding sources that are included in this Flood Risk project are shown in Table 2.
2.5.1 Water Elevations and the Effects of Waves
Specific terminology is used in coastal analyses to indicate which components have been
included in evaluating flood hazards.
24
The stillwater elevation (SWEL or still water level) is the surface of the water resulting from
astronomical tides, storm surge, and freshwater inputs, but excluding wave setup contribution or
the effects of waves.
•Astronomical tides are periodic rises and falls in large bodies of water caused by the
rotation of the earth and by the gravitational forces exerted by the earth, moon and sun.
•Storm surge is the additional water depth that occurs during large storm events. These
events can bring air pressure changes and strong winds that force water up against the
shore.
•Freshwater inputs include rainfall that falls directly on the body of water, runoff from
surfaces and overland flow, and inputs from rivers.
The 1% annual chance stillwater elevation is the stillwater elevation that has been calculated for a
storm surge from a 1% annual chance storm. The 1% annual chance storm surge can be
determined from analyses of tidal gage records, statistical study of regional historical storms, or
other modeling approaches. Stillwater elevations for storms of other frequencies can be
developed using similar approaches.
The total stillwater elevation (also referred to as the mean water level) is the stillwater elevation
plus wave setup contribution but excluding the effects of waves.
•Wave setup is the increase in stillwater elevation at the shoreline caused by the reduction
of waves in shallow water. It occurs as breaking wave momentum is transferred to the
water column.
Like the stillwater elevation, the total stillwater elevation is based on a storm of a particular
frequency, such as the 1% annual chance storm. Wave setup is typically estimated using standard
engineering practices or calculated using models, since tidal gages are often sited in areas
sheltered from wave action and do not capture this information.
Coastal analyses may examine the effects of overland waves by analyzing storm-induced erosion,
overland wave propagation, wave runup, and/or wave overtopping.
•Storm-induced erosion is the modification of existing topography by erosion caused by a
specific storm event, as opposed to general erosion that occurs at a more constant rate.
•Overland wave propagation describes the combined effects of variation in ground
elevation, vegetation, and physical features on wave characteristics as waves move
onshore.
•Wave runup is the uprush of water from wave action on a shore barrier. It is a function of
the roughness and geometry of the shoreline at the point where the stillwater elevation
intersects the land.
•Wave overtopping refers to wave runup that occurs when waves pass over the crest of a
barrier.
25
Figure 5: Wave Runup Transect Schematic
2.5.2 Floodplain Boundaries and BFEs for Coastal Areas
For coastal communities along the Atlantic and Pacific Oceans, the Gulf of Mexico, the Great
Lakes, and the Caribbean Sea, flood hazards must take into account how storm surges, waves,
and extreme tides interact with factors such as topography and vegetation. Storm surge and waves
must also be considered in assessing flood risk for certain communities on rivers or large inland
bodies of water.
Beyond areas that are affected by waves and tides, coastal communities can also have riverine
floodplains with designated floodways, as described in previous sections.
Floodplain Boundaries
In many coastal areas, storm surge is the principle component of flooding. The extent of the 1%
annual chance floodplain in these areas is derived from the total stillwater elevation (stillwater
elevation including storm surge plus wave setup) for the 1% annual chance storm. The methods
that were used for calculation of total stillwater elevations for coastal areas are described in
Section 5.3 of this FIS Report. Location of total stillwater elevations for coastal areas are shown
in Figure 8, “1% Annual Chance Total Stillwater Levels for Coastal Areas.”
In some areas, the 1% annual chance floodplain is determined based on the limit of wave runup or
wave overtopping for the 1% annual chance storm surge. The methods that were used for
calculation of wave hazards are described in Section 5.3 of this FIS Report.
Table 26 presents the types of coastal analyses that were used in mapping the 1% annual
chance floodplain in coastal areas.
Coastal BFEs
Coastal BFEs are calculated as the total stillwater elevation (stillwater elevation including storm
surge plus wave setup) for the 1% annual chance storm plus the additional flood hazard from
overland wave effects (storm-induced erosion, overland wave propagation, wave runup and wave
overtopping).
26
Where they apply, coastal BFEs are calculated along transects extending from offshore to the
limit of coastal flooding onshore. Results of these analyses are accurate until local topography,
vegetation, or development type and density within the community undergoes major changes.
Parameters that were included in calculating coastal BFEs for each transect included in this
FIS Report are presented in Table 17, “Coastal Transect Parameters.” The locations of transects
are shown in Figure 9, “Transect Location Map.” More detailed information about the methods
used in coastal analyses and the results of intermediate steps in the coastal analyses are
presented in Section 5.3 of this FIS Report. Additional information on specific mapping
methods is provided in Section 6.4 of this FIS Report.
2.5.3 Coastal High Hazard Areas
Certain areas along the open coast and other areas may have higher risk of experiencing structural
damage caused by wave action and/or high-velocity water during the 1% annual chance flood.
These areas will be identified on the FIRM as Coastal High Hazard Areas.
•Coastal High Hazard Area (CHHA) is a SFHA extending from offshore to the inland
limit of the primary frontal dune (PFD) or any other area subject to damages caused by
wave action and/or high-velocity water during the 1% annual chance flood.
•Primary Frontal Dune (PFD) is a continuous or nearly continuous mound or ridge of
sand with relatively steep slopes immediately landward and adjacent to the beach. The
PFD is subject to erosion and overtopping from high tides and waves during major
coastal storms.
CHHAs are designated as “V” zones (for “velocity wave zones”) and are subject to more
stringent regulatory requirements and a different flood insurance rate structure. The areas of
greatest risk are shown as VE on the FIRM. Zone VE is further subdivided into elevation zones
and shown with BFEs on the FIRM.
The landward limit of the PFD occurs at a point where there is a distinct change from a relatively
steep slope to a relatively mild slope; this point represents the landward extension of Zone VE.
Areas of lower risk in the CHHA are designated with Zone V on the FIRM. More detailed
information about the identification and designation of Zone VE is presented in Section 6.4 of
this FIS Report.
Areas that are not within the CHHA but are SFHAs may still be impacted by coastal flooding and
damaging waves; these areas are shown as “A” zones on the FIRM.
Figure 6, “Coastal Transect Schematic,” illustrates the relationship between the base flood
elevation, the 1% annual chance stillwater elevation, and the ground profile as well as the
location of the Zone VE and Zone AE areas in an area without a PFD subject to overland wave
propagation. This figure also illustrates energy dissipation and regeneration of a wave as it moves
inland.
27
Figure 6: Coastal Transect Schematic
Methods used in coastal analyses in this FIS project are presented in Section 5.3 and mapping
methods are provided in Section 6.4 of this FIS Report.
Coastal floodplains are shown on the FIRM using the symbology described in Figure 3, “Map
Legend for FIRM.” In many cases, the BFE on the FIRM is higher than the stillwater
elevations shown in Table 17 due to the presence of wave effects. The higher elevation should
be used for construction and/or floodplain management purposes.
2.5.4 Limit of Moderate Wave Action
This section is not applicable to this Flood Risk Project.
SECTION 3.0 – INSURANCE APPLICATIONS
3.1 National Flood Insurance Program Insurance Zones
For flood insurance applications, the FIRM designates flood insurance rate zones as described in
Figure 3, “Map Legend for FIRM.” Flood insurance zone designations are assigned to flooding
sources based on the results of the hydraulic or coastal analyses. Insurance agents use the zones
shown on the FIRM and depths and base flood elevations in this FIS Report in conjunction with
information on structures and their contents to assign premium rates for flood insurance policies.
The 1% annual chance floodplain boundary corresponds to the boundary of the areas of special
flood hazards (e.g. Zones A, AE, V, VE, etc.), and the 0.2% annual chance floodplain boundary
corresponds to the boundary of areas of additional flood hazards.
Table 3 lists the flood insurance zones in the unincorporated and incorporated areas of Jefferson
County.
LiMWA
28
Table 3: Flood Zone Designations by Community
Community Flood Zone(s)
Hoh Indian Tribe A, VE, X
Jefferson County
Unincorporated Area
A, AE, VE, X
City of Port Townsend AE, VE, X
Quinault Indian Nation A, AE, VE, X
3.2 Coastal Barrier Resources System
The Coastal Barrier Resources Act (CBRA) of 1982 was established by Congress to create areas
along the Atlantic and Gulf coasts and the Great Lakes, where restrictions for Federal financial
assistance including flood insurance are prohibited. In 1990, Congress passed the Coastal Barrier
Improvement Act (CBIA), which increased the extent of areas established by the CBRA and
added “Otherwise Protected Areas” (OPA) to the system. These areas are collectively referred to
as the John. H Chafee Coastal Barrier Resources System (CBRS). The CBRS boundaries that
have been identified in the project area are in Table 4, “Coastal Barrier Resource System
Information.”
Table 4: Coastal Barrier Resources System Information
[Not Applicable to this Flood Risk Project]
SECTION 4.0 – AREA STUDIED
4.1 Basin Description
Table 5 contains a description of the characteristics of the HUC-8 sub-basins within which each
community falls. The table includes the main flooding sources within each basin, a brief
description of the basin, and its drainage area.
Table 5: Basin Characteristics
HUC-8 Sub-
Basin Name
HUC-8
Sub-Basin
Number
Primary
Flooding
Source Description of Affected Area
Drainage
Area
(square
miles)
Hood Canal 17100018 Hood Canal East of Jefferson County 322
Puget Sound 17100019 Puget Sound Southeast of Jefferson County 47
Dungeness-
Elwha 17100020 Snow Creel Northeast of Jefferson County 31
Hoh-
Quillayute 17100101 Hoh River Northwest of Jefferson County 821
Queets-
Quinault 17100102 Queets River Southwest of Jefferson County 465
29
4.2 Principal Flood Problems
Table 6 contains a description of the principal flood problems that have been noted for Jefferson
County by flooding source.
Table 6: Principal Flood Problems
Flooding
Source Description of Flood Problems
Big Quilcene
River
Floods for Big Quilcene River were reported by local residents in January
1960, December 1966, and January 1968 (FEMA 1982)
Chimacum
Creek
Overflows its banks and floods agricultural land. Roads are washed out on the
more severe floods (FEMA 1982)
Dosewallips
River
Floods have caused damage along the banks of Dosewallips River (FEMA
1982)
Duckabush
River
The largest flood for Duckabush River occurred in November 1949 (FEMA
1982)
Little Quilcene
River
Has had floods that caused damage seven times since record, two of those
floods hit flood peaks (FEMA 1982)
Marple Creek N/A
Port
Townsend
Creek
N/A
Puget Sound High spring tides and strong winds from winter storms produce storm surges
that are responsible for coastal flooding (FEMA 1982)
Salmon Creek Occasionally overflow their banks but according to local residents, cause little
damage (FEMA 1982)
Snow Creek Occasionally overflow their banks but according to local residents, cause little
damage (FEMA 1982)
30
Table 7 contains information about historic flood elevations in the communities within Jefferson
County.
Table 7: Historic Flooding Elevations
[Not Applicable to this Flood Risk Project]
4.3 Non-Levee Flood Protection Measures
Table 8 contains information about non-levee flood protection measures within Jefferson County
such as dams, jetties, and or dikes. Levees are addressed in Section 4.4 of this FIS Report.
Table 8: Non-Levee Flood Protection Measures
[Not Applicable to this Flood Risk Project]
4.4 Levees
This section is not applicable to this Flood Risk Project.
Table 9: Levees
[Not Applicable to this Flood Risk Project]
31
SECTION 5.0 – ENGINEERING METHODS
For the flooding sources in the community, standard hydrologic and hydraulic study methods
were used to determine the flood hazard data required for this study. Flood events of a magnitude
that are expected to be equaled or exceeded at least once on the average during any 10-, 25-, 50-,
100-, or 500-year period (recurrence interval) have been selected as having special significance
for floodplain management and for flood insurance rates. These events, commonly termed the 10-
, 25-, 50-, 100-, and 500-year floods, have a 10-, 4-, 2-, 1-, and 0.2% annual chance, respectively,
of being equaled or exceeded during any year.
Although the recurrence interval represents the long-term, average period between floods of a
specific magnitude, rare floods could occur at short intervals or even within the same year. The
risk of experiencing a rare flood increases when periods greater than 1 year are considered. For
example, the risk of having a flood that equals or exceeds the 100-year flood (1-percent chance of
annual exceedance) during the term of a 30-year mortgage is approximately 26 percent (about 3
in 10); for any 90-year period, the risk increases to approximately 60 percent (6 in 10). The
analyses reported herein reflect flooding potentials based on conditions existing in the community
at the time of completion of this study. Maps and flood elevations will be amended periodically to
reflect future changes.
The engineering analyses described here incorporate the results of previously issued Letters
of Map Change (LOMCs) listed in Table 27, “Incorporated Letters of Map Change”, which
include Letters of Map Revision (LOMRs). For more information about LOMRs, refer to
Section 6.5, “FIRM Revisions.”
5.1 Hydrologic Analyses
Hydrologic analyses were carried out to establish the peak elevation-frequency relationships for
floods of the selected recurrence intervals for each flooding source studied. Hydrologic analyses
are typically performed at the watershed level. Depending on factors such as watershed size and
shape, land use and urbanization, and natural or man-made storage, various models or
methodologies may be applied. A summary of the hydrologic methods applied to develop
the discharges used in the hydraulic analyses for each stream is provided in Table 13 (USGS
1982). Greater detail (including assumptions, analysis, and results) is available in the archived
project documentation.
A summary of the discharges is provided in Table 10. Frequency Discharge-Drainage Area
Curves used to develop the hydrologic models may also be shown in Figure 7 for selected
flooding sources. A summary of stillwater elevations developed for non-coastal flooding sources
is provided in Table 11. (Coastal stillwater elevations are discussed in Section 5.3 and shown in
Table 17.) Stream gage information is provided in Table 12 (USGS 2007).
32
Table 10: Summary of Discharges
Peak Discharge (cfs)
Flooding
Source Location
Drainage Area
(square miles)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
Existing
1% Annual
Chance
Future
0.2%
Annual
Chance
Big Quilcene
River At Quilcene Bay 69.1 3,580 * 5,200 5,900 * 7,800
Big Quilcene
River
At confluence with
Penny Creek 58.9 3,130 * 4,540 5,140 * 6,780
Chimacum
Creek At Puget Sound 38.0 650 * 920 1,020 * 1,320
Chimacum
Creek
At confluence with
East Fork
Chimacum Creek
24.2 450 * 620 690 * 870
Chimacum
Creek Near Chimacum 14.0 310 * 430 480 * 600
Dosewallips
River
Downstream of
Brinnon 114.5 10,010 * 14,520 16,600 * 21,590
Dosewallips
River
Upstream of
Brinnon 93.4 8,200 * 11,900 13,600 * 17,680
Duckabush
River Near Brinnon 66.5 6,760 * 8,870 9,770 * 11,900
Little Quilcene
River At Quilcene Bay 36.0 1,370 * 1,960 2,210 * 2,880
Little Quilcene
River
At confluence with
Leland Creek 24.6 990 * 1,410 1,590 * 2,060
Marple Creek At Dabob Bay 2.8 180 * 250 280 * 360
Port Townsend
Creek At Discovery Bay 5.5 95 * 130 145 * 175
*Not calculated for this FIS project
33
Table 10: Summary of Discharges (continued)
Peak Discharge (cfs)
Flooding
Source Location
Drainage Area
(square miles)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
Existing
1% Annual
Chance
Future
0.2%
Annual
Chance
Salmon Creek At Discovery Bay 46.1 1,550 * 2,310 2,660 * 3,520
Salmon Creek At confluence with
Snow Creek 21.7 590 * 820 920 * 1,180
Snow Creek At confluence with
Salmon Creek 24.4 960 * 1,490 1,740 * 2,340
*Not calculated for this FIS project
Figure 7: Frequency Discharge-Drainage Area Curves
[Not Applicable to this FIS Project]
Table 11: Summary of Non-Coastal Stillwater Elevations
[Not Applicable to this Flood Risk Project]
34
Table 12: Stream Gage Information used to Determine Discharges
Flooding
Source
Gage
Identifier
Agency
that
Maintains
Gage Site Name
Drainage
Area
(Square
Miles)
Period of Record
From To
Big
Quilcene
River 12052210 USGS
Big Quilcene
River below
diversion near
Quilcene, WA
49 2/17/1994 11/23/2011
Bogachiel
River 12042800 USGS Bogachiel River
near Forks, WA 111 12/2/1975 12/17/1979
Calawah
River 12043000 USGS Calawah River
near Forks, WA 129 N/A 11/22/2011
Chimacum
Creek 12051500 USGS
Chimacum
Creek near
Chimacum, WA
14 1/9/1953 2/26/1957
Clearwater
River 12040000 USGS
Clearwater
River near
Clearwater, WA
140 2/26/1932 12/13/1966
Dosewallips
River 12053000 USGS
Dosewallips
River near
Brinnon, WA
94 1/23/1931 1/14/1968
Dosewallips
River 12053400 USGS
Dosewallips
River Tributary
near Brinnon,
WA
01 2/10/1951 12/13/1969
Duckabush
River 12054000 USGS
Duckabush
River near
Brinnon, WA
67 1/1/1939 11/23/2011
Grader
Creek 12042900 USGS Grader Creek
near Forks, WA 02 11/26/1949 1/14/1988
Hoh River
12040700 USGS
Hoh River
Below MT Tom
Creek near
Forks, WA
98 1/18/1986 10/16/1988
Hoh River 12041000 USGS Hoh River near
Forks, WA 208 10/16/1926 10/21/1963
Hoh River
12041200 USGS
Hoh River at US
Highway 101
near Forks, WA
253 1/15/1961 11/23/2011
Little
Quilcene
River
12052000 USGS
Little Quilcene
River near
Quilcene, WA
24 1/2/1927 2/24/1957
35
Table 12: Stream Gage Information used to Determine Discharges (continued)
Flooding
Source
Gage
Identifier
Agency
that
Maintains
Gage Site Name
Drainage
Area
(Square
Miles)
Period of Record
From To
May Creek 12042700 USGS May Creek near
Forks, WA 02 12/28/1949 1/19/1968
Penny
Creek 12052400 USGS
Penny Creek
near Quilcene,
WA
07 2/22/1949 1/14/1968
Queets
River 12040500 USGS
Queets River
near
Clearwater, WA
445 1/23/1931 11/23/2011
Sitkum
River 12042920 USGS
Sitcum River
Tributary near
Forks, WA
00 12/6/1970 12/21/1974
Snow
Creek 12050500 USGS
Snow Creek
near Maynard,
WA
11 1/8/1953 3/4/1979
Soleduck
River 12041500 USGS
Soleduck River
near Fairholm,
WA
84 12/18/1917 12/17/1979
Soleduck
River 12041600 USGS
Soleduck River
Tributary near
Fairholm, WA
00 11/3/1955 12/21/1974
Soleduck
River 12042500 USGS
Soleduck River
near Quillayute,
WA
219 11/1/1977 12/17/1979
South Fork
Hoh River 12040900 USGS
South Fork Hoh
River near
Forks, WA
50 1/18/1986 10/16/1988
36
5.2 Hydraulic Analyses
Analyses of the hydraulic characteristics of flooding from the sources studied were carried out to
provide estimates of the elevations of floods of the selected recurrence intervals. Base flood
elevations on the FIRM represent the elevations shown on the Flood Profiles and in the Floodway
Data tables in the FIS Report. Rounded whole-foot elevations may be shown on the FIRM in
coastal areas, areas of ponding, and other areas with static base flood elevations. These whole-
foot elevations may not exactly reflect the elevations derived from the hydraulic analyses. Flood
elevations shown on the FIRM are primarily intended for flood insurance rating purposes. For
construction and/or floodplain management purposes, users are cautioned to use the flood
elevation data presented in this FIS Report in conjunction with the data shown on the FIRM. The
hydraulic analyses for this FIS were based on unobstructed flow. The flood elevations shown on
the profiles are thus considered valid only if hydraulic structures remain unobstructed, operate
properly, and do not fail.
For streams for which hydraulic analyses were based on cross sections, locations of selected
cross sections are shown on the Flood Profiles (Exhibit 1). For stream segments for which a
floodway was computed (Section 6.3), selected cross sections are also listed on Table 24,
“Floodway Data.”
A summary of the methods used in hydraulic analyses performed for this project is provided in
Table 13 (FEMA 1982), (USACE 2010). Roughness coefficients are provided in Table 14.
Roughness coefficients are values representing the frictional resistance water experiences
when passing overland or through a channel. They are used in the calculations to
determine water surface elevations. Greater detail (including assumptions, analysis, and
results) is available in the archived project documentation.
37
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38
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1
4
A
39
Table 14: Roughness Coefficients
Flooding Source Channel “n” Overbank “n”
All Streams 0.034-0.050 0.045-0.150
5.3 Coastal Analyses
For the areas of Jefferson County that are impacted by coastal flooding processes, coastal flood
hazard analyses were performed to provide estimates of coastal BFEs. Coastal BFEs reflect the
increase in water levels during a flood event due to extreme tides and storm surge as well as
overland wave effects.
The following subsections provide summaries of how each coastal process was considered for
this FIS Report. Greater detail (including assumptions, analysis, and results) is available in
the archived project documentation. Table 15 summarizes the methods and/or models used for
the coastal analyses (NOAA 2004), (USGS 1988). Refer to Section 2.5.1 for descriptions of
the terms used in this section.
Table 15: Summary of Coastal Analyses
Flooding
Source
Study Limits
From To
Hazard
Evaluated
Model or
Method Used
Date Analysis
was
Completed
Admiralty
Inlet
From
Entrance to
Admiralty
Inlet at Point
Wilson
To Point
Hudson
Wave
Runup ADCIRC (2003) 11/01/2012
Admiralty
Inlet
From Olele
Point
To Northern
entrance to
Mats Mats Bay
Wave
Runup ADCIRC (2003) 11/01/2012
Admiralty
Inlet
From
Southern
entrance to
Mats Mats
Bay
To
Approximately
3,500' Port
Ludlow Marina
Wave
Runup ADCIRC (2003) 11/01/2012
Admiralty
Inlet
From Kinney
Point
To Entrance to
Kilisut Harbor
along
Marrowstone
Island
Wave
Runup ADCIRC (2003) 11/01/2012
Bywater Bay
From
Southern
end of Hood
Head
To Southwest
entrance to
Bywater Bay
Wave
Runup ADCIRC (2003) 11/01/2012
40
Table 15: Summary of Coastal Analyses (continued)
Flooding
Source
Study Limits
From To
Hazard
Evaluated
Model or
Method Used
Date Analysis
was
Completed
Dabob Bay
From
Tskutsko
Point
To Fisherman
Point Wave Runup ADCIRC (2003) 11/01/2012
Dabob Bay
From
Frenchmans
Point
To Pulali
Point Wave Runup ADCIRC (2003) 11/01/2012
Dabob Bay From Wawa
Point
To
approximately
800' west of
Wawa Point
Wave Runup ADCIRC (2003) 11/01/2012
Dabob Bay
From
Southwestern
limit of Right
Smart Cove
To northern
end of
Dosewallips
Mudflats
Wave Runup ADCIRC (2003) 11/01/2012
Discovery
Bay
From County
boundary at
the mouth of
Eagle Creek
To Strait of
Juan de Fuca
coastline at
Cape George
Wave Runup ADCIRC (2003) 11/01/2012
Glen Cove
From Port
Townsend
Paper
Corporation
To
approximately
southern limit
of Glen Cove
Wave Runup ADCIRC (2003) 11/01/2012
Hood Canal From Tala
Point
To southern
end of Hood
Head
Wave Runup ADCIRC (2003) 11/01/2012
Hood Canal From Bywater
Bay
To northern
entrance to
Squamish
Harbor
Wave Runup ADCIRC (2003) 11/01/2012
Hood Canal From Case
Shoal
To the
northeastern
limit of
Thorndyke
Bay adjacent
to the end of
Soaring
Eagle Road
Wave Runup ADCIRC (2003) 11/01/2012
41
Table 15: Summary of Coastal Analyses (continued)
Flooding
Source
Study Limits
From To
Hazard
Evaluated
Model or
Method Used
Date Analysis
was
Completed
Hood Canal
From the
southern limit
of Thorndyke
Bay
To Tskutsko
Point Wave Runup ADCIRC (2003) 11/01/2012
Hood Canal
From
Northern end
of
Dosewallips
Mudflats
To Jefferson
County
boundary
along Hood
Canal
Wave Runup ADCIRC (2003) 11/01/2012
Jackson
Cove
From Pulali
Point
To Wawa
Point Wave Runup ADCIRC (2003) 11/01/2012
Kilisut
Harbor
From
entrance to
Kilisut Harbor
along Indian
Island
To Bishops
Point Wave Runup ADCIRC (2003) 11/01/2012
Kilisut
Harbor
From the
approximately
northeastern
limit of Scow
Bay
To Griffiths
Point Wave Runup ADCIRC (2003) 11/01/2012
Kilisut
Harbor
From northern
part of the
inlet to
Mystery Bay
To entrance
to Kilisut
Harbor along
Marrowstone
Island
Wave Runup ADCIRC (2003) 11/01/2012
Mats Mats
Bay
From northern
entrance to
Mats Mats
Bay
To southern
entrance to
Mats Mats
Bay
Wave Runup ADCIRC (2003) 11/01/2012
Mystery Bay
From the
northernmost
location on
Griffiths Point
To northern
part of the
inlet to
Mystery Bay
Wave Runup ADCIRC (2003) 11/01/2012
Oak Bay
From
southwestern
limit of
Portage Canal
To Olele
Point Wave Runup ADCIRC (2003) 11/01/2012
42
Table 15: Summary of Coastal Analyses (continued)
Flooding
Source
Study Limits
From To
Hazard
Evaluated
Model or
Method Used
Date Analysis
was
Completed
Oak Bay
From southern
limit of
Portage Canal
Indian Island
To Kinney
Point Wave Runup ADCIRC (2003) 11/01/2012
Pacific Ocean
From northern
limit of the
erodibale
dune field on
the spit north
of the mouth
of the Queets
River.
To northern
county
boundary
along the
Pacific
Ocean
Wave Runup ADCIRC (2003) 11/01/2012
Pacific Ocean
From southern
county
boundary
along the
Pacific Ocean
To northern
limit of the
erodibale
dune field
on the spit
north of the
mouth of the
Queets
River.
Wave Runup 0100 11/01/2012
Port Ludlow
Bay
From
approximately
3,500' Port
Ludlow Marina
To Tala
Point Wave Runup ADCIRC (2003) 11/01/2012
Port
Townsend
Bay
From Point
Hudson
To Glen
Cove/Port
Townsend
Paper
Corporation
Wave Runup ADCIRC (2003) 11/01/2012
Port
Townsend
Bay
From
approximate
southern limit
of Glen Cove
To
northwester
n limit of
Portage
Canal
Wave Runup ADCIRC (2003) 11/01/2012
Port
Townsend
Bay
From
northeastern
entrance to
Portage Canal
along Indian
Island
To entrance
to Kilisut
Harbor
along Indian
Island
Wave Runup ADCIRC (2003) 11/01/2012
43
Table 15: Summary of Coastal Analyses (continued)
Flooding
Source
Study Limits
From To
Hazard
Evaluated
Model or
Method Used
Date Analysis
was
Completed
Portage
Canal
From
northwestern
limit of the
canal
To
southwestern
limit of the
canal
Wave Runup ADCIRC (2003) 11/01/2012
Portage
Canal
From
northeastern
entrance to
Portage Canal
along Indian
Island
To southern
limit of
Portage
Canal Indian
Island
Wave Runup ADCIRC (2003) 11/01/2012
Quilcene
Bay
From
Fisherman
Point
To
Frenchmans
Point
Wave Runup ADCIRC (2003) 11/01/2012
Right Smart
Cove
From
approximately
800' west of
Wawa Point
To
southwestern
limit of Right
Smart Cove
Wave Runup ADCIRC (2003) 11/01/2012
Scow Bay From Bishops
Point
To the
approximately
northeastern
limit of Scow
Bay
Wave Runup ADCIRC (2003) 11/01/2012
Squamish
Harbor
From the
approximately
eastern limit
of Squamish
Harbor
To Case
Shoal Wave Runup ADCIRC (2003) 11/01/2012
Strait of
Juan de
Fuca
From west
end of
Protection
Island
To east end
of Protection
Island
Wave Runup ADCIRC (2003) 11/01/2012
Strait of
Juan de
Fuca
From
entrance to
Discovery Bay
at Cape
George
To entrance
to Admiralty
Inlet at Point
Wilson
Wave Runup ADCIRC (2003) 11/01/2012
44
Table 15: Summary of Coastal Analyses (continued)
Flooding
Source
Study Limits
From To
Hazard
Evaluated
Model or
Method Used
Date Analysis
was
Completed
Thorndyke
Bay
From the
northeastern
limit of
Thorndyke
Bay adjacent
to the end of
Soaring
Eagle Road
To the
southern limit
of Thorndyke
Bay adjacent
to the end of
Franks Lane
Wave Runup ADCIRC (2003) 11/01/2012
5.3.1 Total Stillwater Elevations
The total stillwater elevations (stillwater including storm surge plus wave setup) for the 1%
annual chance flood were determined for areas subject to coastal flooding. The models and
methods that were used to determine storm surge and wave setup are listed in Table 15. The
stillwater elevation that was used for each transect in coastal analyses is shown in Table 17,
“Coastal Transect Parameters.” Figure 8 shows the total stillwater elevations for the 1% annual
chance flood that was determined for this coastal analysis.
45
Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas
Astronomical Tide
Astronomical tidal statistics were generated directly from local tidal constituents by sampling
the predicted tide at random times throughout the tidal epoch.
Storm Surge Statistics
Storm surge is modeled based on characteristics of actual storms responsible for significant
coastal flooding. The characteristics of these storms are typically determined by statistical study
of the regional historical record of storms or by statistical study of tidal gages.
When historic records are used to calculate storm surge, characteristics such as the strength, size,
track, etc., of storms are identified by site. Storm data was used in conjunction with numerical
hydrodynamic models to determine the corresponding storm surge levels. An extreme value
analysis was performed on the storm surge modeling results to determine a stillwater elevation
for the 1% annual chance event.
Tidal gages can be used instead of historic records of storms when the available tidal gage
record for the area represents both the astronomical tide component and the storm
surge component. Table 16 provides the gage name, managing agency, gage type, gage
identifier, start date, end date, and statistical methodology applied to each gage used to
determine the stillwater
46
47
elevations. For areas between gages, peak stillwater elevations for selected recurrence intervals
were estimated by combining interpolation between gages and observed high water marks
during major storms. A regionalized statistical approach was applied to the gage data so that
stillwater elevations in areas between gages could be identified.
Table 16: Tide Gage Analysis Specifics
[Not Applicable to this Flood Risk Project]
Combined Riverine and Tidal Effects
A quantitative analysis of the joint probability of riverine flows and storm-influenced tides were
not performed for this study. All rivers that are influenced by tidal inundation at the downstream
end were redelineated. The base flood elevations from coastal still water were delineated into
these rivers up to the locations where the still water and effective riverine BFEs were equal.
Wave Setup Analysis
Wave setup was computed during the storm surge modeling through the methods and
models listed in Table 15 and included in the frequency analysis for the determination of
the total stillwater elevations. The ADCIRC modeling to obtain still water values caused by
tides and surge did not include a coupled wave model to compute wave setup. Static wave
setup was computed along each modeling transect to determine the water level increase
owing to this process along the coast. The oscillating component of wave setup, dynamic
wave setup, was calculated in addition to static setup for areas subject to wave runup hazards.
5.3.2 Waves
This section is not applicable to this Flood Risk Project.
5.3.3 Coastal Erosion
A single storm episode can cause extensive erosion in coastal areas. Storm-induced erosion was
evaluated to determine the modification to existing topography that is expected to be
associated with flooding events. Erosion was evaluated using the methods listed in Table
15.The post-event eroded profile was used for the subsequent transect-based onshore wave
hazard analyses.
5.3.4 Wave Hazard Analyses
A 2-Dimensional wave model (SWAN) was used to compute nearshore wave fields required
for the computation of wave setup and runup effects across 1-Dimensional coastal transects.
Transect locations were chosen with consideration given to the physical land characteristics as
well as development type and density so that they would closely represent conditions in their
locality. Additional consideration was given to changes in the total stillwater elevation.
Transects were spaced close together in areas of complex topography and dense development or
where total stillwater elevations varied. In areas having more uniform characteristics,
transects were spaced at larger intervals. Transects shown in Figure 9, “Transect Location
Map,” are also depicted on the FIRM. Table 17 provides the location, stillwater elevations,
and starting wave conditions for each transect evaluated for overland wave hazards (USACE
2006) (FEMA 2007). In this table, “starting” indicates the parameter value at the beginning of
the transect.
Wave Height Analysis
Wave height analyses were performed to determine wave heights and corresponding wave crest
elevations for the areas inundated by coastal flooding and subject to overland wave propagation
hazards. Refer to Figure 6 for a schematic of a coastal transect evaluated for overland wave
propagation hazards.
Wave heights and wave crest elevations were modeled using the methods and models listed
in Table 15, “Summary of Coastal Analyses”.
Wave Runup Analysis
Wave runup analyses were performed to determine the height and extent of runup beyond the
limit of stillwater inundation for the 1% annual chance flood. Wave runup elevations
were modeled using the methods and models listed in Table 15 (TAC 2002).
48
49
Table 17: Coastal Transect Parameters
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Pacific
Ocean
1 0.0 0.0 *
*
*
*
*
*
11.2
11.2-11.2
*
*
Pacific
Ocean
2 0.0 0.0 *
*
*
*
*
*
11.2
11.2-11.2
*
*
Pacific
Ocean
3 0.0 0.0 *
*
*
*
*
*
11.2
11.2-11.2
*
*
Pacific
Ocean
4 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Pacific
Ocean
5 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Pacific
Ocean
6 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Pacific
Ocean
7 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Pacific
Ocean
8 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
*Not calculated for this FIS project
50
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Pacific
Ocean
9 0.0 0.0 *
*
*
*
*
*
11.4
11.4-11.4
*
*
Pacific
Ocean
10 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Pacific
Ocean
11 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Strait of
Juan de
Fuca
12 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Discovery
Bay
13 0.0 0.0 *
*
*
*
*
*
11.4
11.4-11.4
*
*
Discovery
Bay
14 0.0 0.0 *
*
*
*
*
*
11.4
11.4-11.4
*
*
Discovery
Bay
15 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
16 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
17 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
*Not calculated for this FIS project
51
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Discovery
Bay
18 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
19 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
20 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
21 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
22 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
23 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
24 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
25 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
26 0.0 0.0 *
*
*
*
*
*
11.4
11.4-11.4
*
*
*Not calculated for this FIS project
52
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Discovery
Bay
27 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
28 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
29 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
30 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
31 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
32 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
33 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
Discovery
Bay
34 0.0 0.0 *
*
*
*
*
*
11.3
11.3-11.3
*
*
*Not calculated for this FIS project
53
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Discovery
Bay
35 0.0 0.0 *
*
*
*
*
*
11.4
11.4-11.4
*
*
Discovery
Bay
36 0.0 0.0 *
*
*
*
*
*
11.4
11.4-11.4
*
*
Discovery
Bay
37 0.0 0.0 *
*
*
*
*
*
11.4
11.4-11.4
*
*
Discovery
Bay
38 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Strait of
Juan de
Fuca
39 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Strait of
Juan de
Fuca
40 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Strait of
Juan de
Fuca
41 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Strait of
Juan de
Fuca
42 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
*Not calculated for this FIS project
54
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Admiralty
Inlet
43 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Admiralty
Inlet
44 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Admiralty
Inlet
45 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Admiralty
Inlet
46 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
47 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
48 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
49 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
50 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
*Not calculated for this FIS project
55
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Port
Townsend
Bay
51 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
52 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
53 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
54 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
55 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
56 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Port
Townsend
Bay
57 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
*Not calculated for this FIS project
56
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Port
Townsend
Bay
58 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
59 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
60 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Portage
Canal
61 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Oak Bay 62 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Oak Bay 63 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Oak Bay 64 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Oak Bay 65 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
*Not calculated for this FIS project
57
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Oak Bay 66 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Oak Bay 67 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Oak Bay 68 0.0 0.0 *
*
*
*
*
*
12.3
12.3-12.3
*
*
Oak Bay 69 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Admiralty
Inlet
70 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Mats Mats
Bay
71 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Mats Mats
Bay
72 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Mats Mats
Bay
73 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Mats Mats
Bay
74 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
*Not calculated for this FIS project
58
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Mats Mats
Bay
75 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Mats Mats
Bay
76 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Mats Mats
Bay
77 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Mats Mats
Bay
78 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Mats Mats
Bay
79 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Admiralty
Inlet
80 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Admiralty
Inlet
81 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Admiralty
Inlet
82 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Admiralty
Inlet
83 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
*Not calculated for this FIS project
59
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Admiralty
Inlet
84 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Admiralty
Inlet
85 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Port Ludlow
Bay
86 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
87 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
88 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
89 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
90 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
91 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
92 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
*Not calculated for this FIS project
60
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Port Ludlow
Bay
93 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
94 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
95 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Port Ludlow
Bay
96 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 97 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 98 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 99 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 100 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 101 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
*Not calculated for this FIS project
61
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Hood Canal 102 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Bywater Bay 103 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Bywater Bay 104 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 105 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 106 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 107 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Squamish
Harbor
108 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Squamish
Harbor
109 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Squamish
Harbor
110 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
*Not calculated for this FIS project
62
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Squamish
Harbor
111 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Squamish
Harbor
112 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 113 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 114 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 115 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Thorndyke
Bay
116 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Thorndyke
Bay
117 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 118 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 119 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
*Not calculated for this FIS project
63
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Hood Canal 120 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 121 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 122 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Hood Canal 123 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Hood Canal 124 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 125 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Hood Canal 126 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 127 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 128 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
*Not calculated for this FIS project
64
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Hood Canal 129 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 130 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 131 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 132 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 133 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 134 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Hood Canal 135 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 136 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 137 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
*Not calculated for this FIS project
65
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Hood Canal 138 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 139 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 140 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Dabob Bay 141 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Dabob Bay 142 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 143 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 144 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 145 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 146 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
*Not calculated for this FIS project
66
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Dabob Bay 147 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 148 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Dabob Bay 149 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Dabob Bay 150 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Dabob Bay 151 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 152 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 153 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 154 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 155 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
*Not calculated for this FIS project
67
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Dabob Bay 156 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 157 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 158 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 159 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 160 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Dabob Bay 161 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Dabob Bay 162 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Dabob Bay 163 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Dabob Bay 164 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
*Not calculated for this FIS project
68
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Dabob Bay 165 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Quilcene
Bay
166 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Quilcene
Bay
167 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Quilcene
Bay
168 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Quilcene
Bay
169 0.0 0.0 *
*
*
*
*
*
12.7
12.7-12.7
*
*
Quilcene
Bay
170 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Dabob Bay 171 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 172 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 173 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
*Not calculated for this FIS project
69
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Dabob Bay 174 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 175 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 176 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Jackson
Cove
177 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Jackson
Cove
178 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Jackson
Cove
179 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Jackson
Cove
180 0.0 0.0 *
*
*
*
*
*
12.6
12.6-12.6
*
*
Jackson
Cove
181 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Jackson
Cove
182 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
*Not calculated for this FIS project
70
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Jackson
Cove
183 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 184 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Right Smart
Cove
185 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Right Smart
Cove
186 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 187 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 188 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Dabob Bay 189 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 190 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 191 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
*Not calculated for this FIS project
71
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Hood Canal 192 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 193 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 194 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 195 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 196 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 197 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 198 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 199 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Hood Canal 200 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
*Not calculated for this FIS project
72
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Hood Canal 201 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Admiralty
Inlet
202 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Admiralty
Inlet
203 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Admiralty
Inlet
204 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Admiralty
Inlet
205 0.0 0.0 *
*
*
*
*
*
11.8
11.8-11.8
*
*
Admiralty
Inlet
206 0.0 0.0 *
*
*
*
*
*
11.9
11.9-11.9
*
*
Admiralty
Inlet
207 0.0 0.0 *
*
*
*
*
*
12.0
12.0-12.0
*
*
Admiralty
Inlet
208 0.0 0.0 *
*
*
*
*
*
12.0
12.0-12.0
*
*
Admiralty
Inlet
209 0.0 0.0 *
*
*
*
*
*
12.1
12.1-12.1
*
*
*Not calculated for this FIS project
73
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Admiralty
Inlet
210 0.0 0.0 *
*
*
*
*
*
12.3
12.3-12.3
*
*
Admiralty
Inlet
211 0.0 0.0 *
*
*
*
*
*
12.4
12.4-12.4
*
*
Oak Bay 212 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Oak Bay 213 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Oak Bay 214 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Oak Bay 215 0.0 0.0 *
*
*
*
*
*
12.5
12.5-12.5
*
*
Port
Townsend
Bay
216 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
217 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
*Not calculated for this FIS project
74
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Port
Townsend
Bay
218 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
219 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Port
Townsend
Bay
220 0.0 0.0 *
*
*
*
*
*
11.5
11.5-11.5
*
*
Kilisut
Harbor
221 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Kilisut
Harbor
222 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Scow Bay 223 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Scow Bay 224 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Scow Bay 225 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
*Not calculated for this FIS project
75
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Scow Bay 226 0.0 0.0 *
*
*
*
*
*
11.8
11.8-11.8
*
*
Scow Bay 227 0.0 0.0 *
*
*
*
*
*
11.8
11.8-11.8
*
*
Scow Bay 228 0.0 0.0 *
*
*
*
*
*
11.8
11.8-11.8
*
*
Scow Bay 229 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Scow Bay 230 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Scow Bay 231 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Scow Bay 232 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Kilisut
Harbor
233 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Kilisut
Harbor
234 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
*Not calculated for this FIS project
76
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Kilisut
Harbor
235 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Kilisut
Harbor
236 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Mystery Bay 237 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Mystery Bay 238 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Mystery Bay 239 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Mystery Bay 240 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Mystery Bay 241 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Kilisut
Harbor
242 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
Kilisut
Harbor
243 0.0 0.0 *
*
*
*
*
*
11.7
11.7-11.7
*
*
*Not calculated for this FIS project
77
Flood
Source
Coastal
Transect
Starting Wave Conditions for the
1% Annual Chance
Starting Stillwater Elevations
(ft NAVD88)
Range of Stillwater Elevations
(ft NAVD88)
Significant
Wave Height
Hs (ft)
Peak Wave
Period
Tp (sec)
10% Annual
Chance
4% Annual
Chance
2% Annual
Chance
1% Annual
Chance
0.2% Annual
Chance
Kilisut
Harbor
244 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Kilisut
Harbor
245 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
Kilisut
Harbor
246 0.0 0.0 *
*
*
*
*
*
11.6
11.6-11.6
*
*
*Not calculated for this FIS project
Strait of Juan de Fuca
Port Townsend Bay
DiscoveryBay
JeffersonCounty530069
JeffersonCounty530069
CITY OFPORT TOWNSEND530070
S a l m o n Creek
E
a
g
l
e
C
reek
E a g l e C r e e k
C o n t r a c t o r s C r e e k
S n o w
C r
e
e
k
C
h
i
m
a
c
u
m
C
r
e
e
k
¬«20
¬«116
¬«19
¬«19
¬«101
¬«101
¬«20
¬«20
¬«20
(61
(62
(26
(
25
(60
(
2
3
(
27
(24
(
1
8
(54
(28
(
5
8
(
5
9
(
2
2
(
2
9
(43
(
22
0
(
4
7
(44
(39
(
40
(
4
2
(32
(52 (218
(
50
(
1
2
(20
(35
(15
(19
(56 (216
(13
(37
(38
(31
(51
(53
(34
(57
(
4
1
(21
(45
(
3
6
(217
(
30
(16
(55(33
(17
(
1
4
(46
(
4
8
(219
(
4
9
NATIONAL FLOOD INSURANCE PROGRAM
TRANSECT LOCATOR MAPJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS WITH TRANSECTS:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND1C
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 1 miles
0 1 20.5 Miles
0068, 0069, 0107, 0110, 0120, 0130, 0131, 0132, 0135, 0140, 0142, 0155, 01600165, 0170, 0225, 0435, 0455, 0480, 0485, 0490, 0495, 0515, 0575, 0600, 09030905, 0910, 0915, 0920, 0930, 0935, 0940, 1000, 1284, 1285, 1290, 1295, 13051310, 1315, 1320, 1375, 1400, 1655
Figure 9: Transect Location Map
Port Townsend Bay
DiscoveryBay
Puget Sound
Puget Sound
Puget Sound
JeffersonCounty530069
JeffersonCounty530069
CITY OFPORT TOWNSEND530070
C
h
i
m
a
c
u
m
C
r
e
e
k
C h i m a c u m C r e e k
C
h
i
m
a
c
u
m
C
r
e
e
k
¬«19
¬«19
¬«116
¬«116
¬«20
¬«20
(77
(
7
8
(79(74
(240
(
71
(
2
3
6
(72
(
75
(237
(61
(238
(228
(239
(76
(
2
4
1
(60
(235
(223
(230
(243
(229
(227
(242
(225
(221
(234
(
73
(63
(222
(246
(233 (232
(226
(224
(231
(54
(64
(
5
8
(82
(
5
9
(244
(245
(80
(214
(20
4
(84
(
22
0
(
4
7
(209
(83
(
2
0
3
(206
(65
(32
(52 (218
(
50
(56 (216
(210
(
21
1
(
2
0
2
(31
(81
(207
(215
(51
(69
(213
(53
(34
(57
(70
(66
(45
(212
(217
(
30
(67
(55(33
(208
(68
(
20
5
(62
(46
(
4
8
(219
(
4
9
NATIONAL FLOOD INSURANCE PROGRAM
TRANSECT LOCATOR MAPJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS WITH TRANSECTS:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND1C
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 1 miles
0 1 20.5 Miles
0068, 0069, 0107, 0110, 0120, 0130, 0131, 0132, 0135, 0140, 0142, 0155, 01600165, 0170, 0225, 0435, 0455, 0480, 0485, 0490, 0495, 0515, 0575, 0600, 09030905, 0910, 0915, 0920, 0930, 0935, 0940, 1000, 1284, 1285, 1290, 1295, 13051310, 1315, 1320, 1375, 1400, 1655
Figure 9: Transect Location Map (continued)
Puget Sound
Puget Sound
Dababo Bay
JeffersonCounty530069
JeffersonCounty530069
T h o r n d y k e
C
r
e
e
k
Ta
r
b
o
o
C
r
e
e
k
C h i m a c u m C r e e k
T
a
r
b
o
o
C
r
e
e
k
¬«19
¬«104
¬«104
(6
Figure 9: Transect Location Map (continued)
(77
(
7
8
(90
(79(74
(
71
(72
(
75(76
(88
(91
(103
(
73
(
8
9
(93
(87
(86
(
9
4
(95
(105
(82
(104
(110
(10
9
(80
(116
(111
(84
(161
(163
(157
(159
(96
(10
1
(99(92
(83
(118
(120
(158
(10
8
(
1
0
7
(102
(162
(85
(97
(154
(112
(160
(98
(
16
4
(153
(81
(117
(149
(
11
5
(
1
1
4
(100
(70
(119
(151
(106
(155
(152
(150
(113
(
1
5
6
NATIONAL FLOOD INSURANCE PROGRAM
TRANSECT LOCATOR MAPJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS WITH TRANSECTS:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND1C
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 1 miles
0 1 20.5 Miles
0068, 0069, 0107, 0110, 0120, 0130, 0131, 0132, 0135, 0140, 0142, 0155, 01600165, 0170, 0225, 0435, 0455, 0480, 0485, 0490, 0495, 0515, 0575, 0600, 09030905, 0910, 0915, 0920, 0930, 0935, 0940, 1000, 1284, 1285, 1290, 1295, 13051310, 1315, 1320, 1375, 1400, 1655
Dababo Bay
Dababo Bay
Puget Sound
JeffersonCounty530069
JeffersonCounty530069
T h o r n d y k e
C r e e k
D o n o v a n
C r e
e
k
B i g Q u i l c e n e R i v e r
D
ose
w
allips
River
PennyCreek
SpencerCre
e
k
W a l k e r s C r e e k
MarpleCreek
L e l a n d
C r e e k
Turner Creek
E l b o C r e e k
J a c k s o n C r e e k
LittleQuilceneRiver
I n d i a n G e o r g e C r e e k
¬«101
¬«101
¬«101
(130
(137
(
1
2
1
(131
(183 (177
(132
(
1
7
9
(122(123
(191
(
1
7
6
(181
(
1
8
0
(
128
(
1
7
8
(116
(
1
2
4
(
12
5
(161
(163
(
1
6
5
(157
(159
(
1
8
4
(170
(
1
3
5
(
13
8
(143
(118
(120
(174
(158
(133
(147
(126
(162
(141
(173
(154
(160
(140
(127
(145
(
16
4
(169
(175
(188
(146
(153
(134
(117
(149
(
1
3
6
(171
(187
(129
(189
(144
(119(166
(151
(148
(168
(155
(190
(185
(152
(167
(150
(139
(182
(
1
4
2
(
1
5
6
(
1
8
6
(17
2
NATIONAL FLOOD INSURANCE PROGRAM
TRANSECT LOCATOR MAPJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS WITH TRANSECTS:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND1C
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 1 miles
0 1 20.5 Miles
0068, 0069, 0107, 0110, 0120, 0130, 0131, 0132, 0135, 0140, 0142, 0155, 01600165, 0170, 0225, 0435, 0455, 0480, 0485, 0490, 0495, 0515, 0575, 0600, 09030905, 0910, 0915, 0920, 0930, 0935, 0940, 1000, 1284, 1285, 1290, 1295, 13051310, 1315, 1320, 1375, 1400, 1655
Figure 9: Transect Location Map (continued)
Dababo Bay
Puget Sound
JeffersonCounty530069
F
u
lt
o
n
C
r
e
e
k
Rock
y
B
r
o
o
k
M i l e an d A H a l f C r e e k
D o s e w a l l i p s R i v e r
S
p
e
n
c
e
r
C
r
e
e
k
M c D o n a l d
C r e
e
k
W a l k e r s C r e e k
BigQuilceneRiver
MarpleCreek
T h r e e m i l e C r e e k
W i l s o n C r e e k
D
e
s
e
r
t
e r
C r e e k
Turner Creek
So u t h F o r k
Fu l t o n C r e e k
DuckabushRiver
E l b o C r e e k
J a c k s o n C r e e k
¬«101
¬«101
¬«101
(129
(131
(130
(
128
(137
(183 (177
(
1
7
9
(191
(
1
7
6
(181
(
1
8
0
(
1
7
8
(
1
6
5
(
1
8
4
(
13
8
(143
(19
4
(
1
9
8
(174
(147
(141
(173
(140
(145
(175
(188
(146
(
1
3
6
(171
(187
(189
(144
(195
(148
(190
(201
(185
(197
(139
(182
(
1
4
2
(199
(192
(
1
8
6
(17
2
(
19
3(19
6
(
2
0
0
NATIONAL FLOOD INSURANCE PROGRAM
TRANSECT LOCATOR MAPJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS WITH TRANSECTS:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND1C
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 1 miles
0 1 20.5 Miles
0068, 0069, 0107, 0110, 0120, 0130, 0131, 0132, 0135, 0140, 0142, 0155, 01600165, 0170, 0225, 0435, 0455, 0480, 0485, 0490, 0495, 0515, 0575, 0600, 09030905, 0910, 0915, 0920, 0930, 0935, 0940, 1000, 1284, 1285, 1290, 1295, 13051310, 1315, 1320, 1375, 1400, 1655
Figure 9: Transect Location Map (continued)
Pacific Ocean
Pacific Ocean
JeffersonCounty530069
JeffersonCounty530069
HOH INDIANTRIBE530329
C e d a r C r e e k
Dry Creek
Falls Cre
e
k
M o s quito Creek
F
o s s i l
C r e e k
J
a
c
k
s
o
n
C
r
e
e
k
M
axfield
Cre
e
k
MinterCreek
Hoh River
MurphyCreek
South
Fork
Maxfield
Creek
GoodmanCreek
S c o t t
C r e e k
¬«101
(8
(11
(9
(7
(10
NATIONAL FLOOD INSURANCE PROGRAM
TRANSECT LOCATOR MAPJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS WITH TRANSECTS:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND1C
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 1 miles
0 1 20.5 Miles
0068, 0069, 0107, 0110, 0120, 0130, 0131, 0132, 0135, 0140, 0142, 0155, 01600165, 0170, 0225, 0435, 0455, 0480, 0485, 0490, 0495, 0515, 0575, 0600, 09030905, 0910, 0915, 0920, 0930, 0935, 0940, 1000, 1284, 1285, 1290, 1295, 13051310, 1315, 1320, 1375, 1400, 1655
Figure 9: Transect Location Map (continued)
Pacific Ocean
Pacific Ocean
JeffersonCounty530069
QUINAULTINDIAN NATION535535
SouthForkCedarCreek
S h a l e C r e e k
E l k h o r n C r e e k
Christmas
Creek
C
o
u
g
a
r
C
r
e
e
k
M
i
n
k
C
r
e
e
k
E
a
st
F
o
r
k
M
ill
e
r
C
r
e
e
k
ElkCreek
KnorrCreek
S
al
m
o
n
R
i
v
e
r
M i l l e r C r e e k
M
ill
e
r
C
r
e
e
k
SandCreek
H i b b a r d C r e e k
W i l d c a t C r e e k
Hun
t
C
r
e
e
k
C h r i s t m a s
C r e e k
K
a
l
a
l
o
c
h
C
r
e
e
k
K a l a l o c h C r e e k
E a s t F o r k K a l a l o c h C r e e k
Hurst Creek
S t e a m b o a t C r e e k
K e r r C r e e k
C
e
d
a
r
C
r
e
e
k
Waring
C
r
e
e
k
W e s t F o r k K a l a l o c h C r e e k
HarlowCreek
Moses
Creek
HarlowCreek
Q u e e t s R i v e r
C e d a rCreekCedarCreek
Q u e e t s R i v e r
M c K i n n o n C r e e k
FisherCreek
ClearwaterRiver
C l e a r w a t e
r
R
i
v
e
r
C l e a r w a t e r
R
i
v
e
r
B o u l d e r C r e e k
¬«101
¬«101
¬«101
¬«101
(1
(5
(3
(2
(6
(4
NATIONAL FLOOD INSURANCE PROGRAM
TRANSECT LOCATOR MAPJEFFERSON COUNTY, WA AND INCORPORATED AREAS
PANELS WITH TRANSECTS:
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR ADDITIONAL INFORMATION
HTTP://MSC.FEMA.GOV MAP NUMBER
MAP REVISED
53031CIND1C
Map Projection:NAD 1983 UTM Zone 10NNorth American Datum of 1983
1 inch = 1 miles
0 1 20.5 Miles
0068, 0069, 0107, 0110, 0120, 0130, 0131, 0132, 0135, 0140, 0142, 0155, 01600165, 0170, 0225, 0435, 0455, 0480, 0485, 0490, 0495, 0515, 0575, 0600, 09030905, 0910, 0915, 0920, 0930, 0935, 0940, 1000, 1284, 1285, 1290, 1295, 13051310, 1315, 1320, 1375, 1400, 1655
Figure 9: Transect Location Map (continued)
5.4 Alluvial Fan Analyses
This section is not applicable to this FIS project.
Table 18: Summary of Alluvial Fan Analyses
[Not Applicable to this FIS Project]
Table 19: Results of Alluvial Fan Analyses
[Not Applicable to this FIS Project
SECTION 6.0 – MAPPING METHODS
6.1 Vertical and Horizontal Control
All FIS Reports and FIRMs are referenced to a specific vertical datum. The vertical datum
provides a starting point against which flood, ground, and structure elevations can be referenced
and compared. Until recently, the standard vertical datum used for newly created or revised FIS
Reports and FIRMs was the National Geodetic Vertical Datum of 1929 (NGVD29). With the
completion of the North American Vertical Datum of 1988 (NAVD88), many FIS Reports and
FIRMs are now prepared using NAVD88 as the referenced vertical datum.
Flood elevations shown in this FIS Report and on the FIRMs are referenced to NAVD88. These
flood elevations must be compared to structure and ground elevations referenced to the same
vertical datum. For information regarding conversion between NGVD29 and NAVD88 or other
datum conversion, visit the National Geodetic Survey website at www.ngs.noaa.gov, or contact
the National Geodetic Survey at the following address:
NGS Information Services
NOAA, N/NGS12
National Geodetic Survey
SSMC-3, #9202
1315 East-West Highway
Silver Spring, Maryland 20910-3282
(301) 713-3242
Temporary vertical monuments are often established during the preparation of a flood hazard
analysis for the purpose of establishing local vertical control. Although these monuments are not
shown on the FIRM, they may be found in the archived project documentation associated with the
FIS Report and the FIRMs for this community. Interested individuals may contact FEMA to
access these data.
To obtain current elevation, description, and/or location information for benchmarks in the area,
please contact information services Branch of the NGS at (301) 713-3242, or visit their website at
www.ngs.noaa.gov.
85
The datum conversion locations and values that were calculated for Jefferson County are
provided in Table 20
Table 20: Countywide Vertical Datum Conversion
[Not Applicable to this Flood Risk Project]
A countywide conversion factor could not be generated for Jefferson County because the
maximum variance from average exceeds 0.25 feet. Calculations for the vertical offsets on a
stream by stream basis are depicted in Table 21.
Table 21: Stream-by-Stream Vertical Datum Conversion
Flooding Source
Average Vertical Datum
Conversion Factor (feet)
Big Quilcene River (Left Overbank) 3.6
Big Quilcene River (Main Channel) 3.6
Big Quilcene River (Upstream Reach) 3.6
Chimacum Creek 3.5
Dosewallips River 3.6
Duckabush River 3.6
Little Quilcene River 3.6
Marple Creek 3.6
Port Townsend Creek 3.5
Salmon Creek 3.6
Snow Creek 3.6
6.2 Base Map
The FIRMs and FIS Report for this project have been produced in a digital format. The flood
hazard information was converted to a Geographic Information System (GIS) format that meets
FEMA’s FIRM database specifications and geographic information standards. This information is
provided in a digital format so that it can be incorporated into a local GIS and be accessed more
easily by the community. The FIRM Database includes most of the tabular information contained
in the FIS Report in such a way that the data can be associated with pertinent spatial features. For
example, the information contained in the Floodway Data table and Flood Profiles can be linked
to the cross sections that are shown on the FIRMs. Additional information about the FIRM
Database and its contents can be found in FEMA’s Guidelines and Standards for Flood Risk
Analysis and Mapping, http://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-
mapping
Base map information shown on the FIRM was derived from the sources described in Table 22.
86
Table 22: Base Map Sources
Data Type Data Provider
Data
Date
Data
Scale Data Description
Political
Boundaries
U.S.
Department of
Commerce -
U.S. Census
Bureau
2013 1:12,000 Jefferson County, GIS Data
(municipal and county boundaries)
2013 TIGER
Line Shapefiles
U.S.
Department of
Commerce -
U.S. Census
Bureau
2013 1:24,000 Transportation Features
Effective FEMA
FIRMs
Federal
Emergency
Management
Agency
1982 1:500 Flood Insurance Rate Map
PLSS
U.S.
Department of
the Interior -
Bureau of
Land
Management
2014 1:12,000 Geographic Coordinate Data Base
Public Land Survey System
National
Hydrography
Dataset
U.S.
Department of
the Interior -
U.S.
Geological
Survey
2013 1:12,000 Surface Water Area Features and
Surface Water Lines
Submittal
Information STARR 2015 N/A
Contains essential information
about the flood risk project such as
the FEMA case number and utilized
engineering models.
6.3 Floodplain and Floodway Delineation
The FIRM shows tints, screens, and symbols to indicate floodplains and floodways as well as the
locations of selected cross sections used in the hydraulic analyses and floodway computations.
For riverine flooding sources, the mapped floodplain boundaries shown on the FIRM have been
delineated using the flood elevations determined at each cross section; between cross sections,
the boundaries were interpolated using the topographic elevation data described in Table 23. For
each coastal flooding source studied as part of this FIS Report, the mapped floodplain
boundaries on the FIRM have been delineated using the flood and wave elevations determined
at each transect; between transects, boundaries were delineated using land use and land
cover data, the topographic elevation data described in Table 23, and knowledge of
coastal flood processes (FEMA 2014). In ponding areas, flood elevations were determined at
each junction of the model;
87
between junctions, boundaries were interpolated using the topographic elevation data described
in Table 23.
In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the
1% annual chance floodplain boundary has been shown. Small areas within the floodplain
boundaries may lie above the flood elevations but cannot be shown due to limitations of the map
scale and/or lack of detailed topographic data.
The floodway widths presented in this FIS Report and on the FIRM were computed for certain
stream segments on the basis of equal conveyance reduction from each side of the floodplain.
Floodway widths were computed at cross sections. Between cross sections, the floodway
boundaries were interpolated. Table 2 indicates the flooding sources for which floodways have
been determined. The results of the floodway computations for those flooding sources have
been tabulated for selected cross sections and are shown in Table 24, “Floodway Data.”
Table 23: Summary of Topographic Elevation Data used in Mapping
Source for Topographic Elevation Data
Community Flooding Source Description Scale
Contour
Interval Citation
Jefferson
County
Unincorporated
Area, Quinault
Indian Nation
N/A USGS NED DEM 1:24,000 2-foot Riverine
Hydraulics
Jefferson
County
Unincorporated
Area
Big Quilcene River
(Upstream
Reach),
Chimacum Creek,
Dosewallips River,
Duckabush River,
Little Quilcene
River, Port
Townsend Creek
USGS NED DEM 1:24,000 2-foot Riverine
Hydraulics
Hoh Indian
Tribe, Jefferson
County
Unincorporated
Area
N/A USGS NED DEM 1:24,000 2-foot Riverine
Hydraulics
BFEs shown at cross sections on the FIRM represent the 1% annual chance water surface
elevations shown on the Flood Profiles and in the Floodway Data tables in the FIS Report.
Rounded whole-foot elevations may be shown on the FIRM in coastal areas, areas of ponding,
and other areas with static base flood elevations.
88
Table 24: Floodway Data
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION (NAVD88)
CROSS SECTION DISTANCE1 WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET)
WITHOUT
FLOODWAY
(FEET)
WITH
FLOODWAY
(FEET)
INCREASE
(FEET)
BIG QUILCENE RIVER
(MAIN CHANNEL)
A 2,330 160 238 10.1 15.8 15.8 15.8 0.0
B 2,960 150 320 0.8 19.0 19.0 19.0 0.0
C 3,110 150 138 17.5 19.1 19.1 19.1 0.0
D 3,273 740 196 12.3 20.1 20.1 20.1 0.0
E 4,043 495 324 7.4 23.8 23.8 23.8 0.0
F 4,133 522 23 104.8 26.0 26.0 26.0 0.0
BIG QUILCENE RIVER
(UPSTREAM REACH)
G 4,183 700 3,645 1.6 27.1 27.1 28.1 1.0
H 5,833 223 781 7.6 32.7 32.7 32.7 0.0
I 8,033 339 1,314 4.5 50.5 50.5 51.1 0.6
J 9,653 387 900 6.6 66.0 66.0 66.3 0.3
K 11,103 251 878 6.7 78.0 78.0 79.0 1.0
L 13,203 120 556 10.6 98.9 98.9 98.9 0.0
M 14,453 104 625 9.4 109.2 109.2 109.5 0.3
N 14,653 147 843 7.0 110.9 110.9 111.0 0.1
1Feet above confluence with Quilcene Bay
T
A
B
L
E
2
4
FEDERAL EMERGENCY MANAGEMENT AGENCY
JEFFERSON COUNTY, WA
AND INCORPORATED AREAS
FLOODWAY DATA
BIG QUILCENE RIVER
89
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION (NAVD88)
CROSS SECTION DISTANCE WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET)
WITHOUT
FLOODWAY
(FEET)
WITH
FLOODWAY
(FEET)
INCREASE
(FEET)
14,8381 167 590 10.0 112.0 112.0 112.0 0.0
15,3981 315 704 8.4 120.1 120.1 120.1 0.0
17,2781 166 675 8.7 139.4 139.4 140.2 0.8
20,4281 451 737 8.0 168.1 168.1 168.4 0.3
22,5581 125 463 12.7 195.0 195.0 195.0 0.0
2,5002 163 675 1.5 12.7 12.7 12.7 0.0
4,4802 85 185 5.5 20.7 20.7 20.7 0.0
5,2502 142 343 3.0 27.5 27.5 27.5 0.0
5,9802 110 201 5.1 38.8 38.8 38.8 0.0
7,7702 128 410 2.5 51.0 51.0 51.0 0.0
8,1902 65 240 4.3 52.2 52.2 52.2 0.0
8,5302 263 1,166 0.9 53.0 53.0 53.0 0.0
8,7802 81 157 6.5 53.5 53.5 53.5 0.0
9,0002 465 6,312 0.2 74.8 74.8 74.8 0.0
10,9302 103 333 3.1 74.6 74.6 74.8 0.0
12,0102 155 503 2.0 78.0 78.0 78.0 0.0
BIG QUILCENE RIVER
(UPSTREAM REACH)
O
P
Q
R
S
CHIMACUM CREEK
A
B
C
D
E
F
G
H
I
J
K
L 12,8502 27 183 5.6 79.8 79.8 80.2 0.4
1Feet above confluence with Quilcene Bay
2Feet above confluence with Puget Sound
T
A
B
L
E
2
4
FEDERAL EMERGENCY MANAGEMENT AGENCY
JEFFERSON COUNTY, WA
AND INCORPORATED AREAS
FLOODWAY DATA
BIG QUILCENE RIVER – CHIMACUM CREEK
90
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION (NAVD88)
CROSS SECTION DISTANCE1 WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET)
WITHOUT
FLOODWAY
(FEET)
WITH
FLOODWAY
(FEET)
INCREASE
(FEET)
CHIMACUM CREEK
M 12,970 103 522 2.0 80.2 80.2 80.8 0.6
N 13,560 149 679 1.5 80.8 80.8 81.5 0.0
O 13,810 325 2,325 0.4 86.4 86.4 87.0 0.6
P 14,660 56 138 7.4 87.4 87.4 87.4 0.0
Q 15,970 390 1,578 0.6 89.3 89.3 89.9 0.6
R 17,420 89 141 7.2 91.7 91.7 92.2 0.5
S 18,390 148 357 1.9 100.2 100.2 100.4 0.2
T 20,190 56 108 6.5 115.1 115.1 115.1 0.0
U 21,040 45 196 3.5 120.1 120.1 120.7 0.6
V 21,150 29 188 3.7 120.3 120.3 120.9 0.6
W 21,220 46 193 3.6 121.2 121.2 121.8 0.6
1Feet above confluence with Puget Sound
T
A
B
L
E
2
4
FEDERAL EMERGENCY MANAGEMENT AGENCY
JEFFERSON COUNTY, WA
AND INCORPORATED AREAS
FLOODWAY DATA
CHIMACUM CREEK
91
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION (NAVD88)
CROSS SECTION DISTANCE1 WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET)
WITHOUT
FLOODWAY
(FEET)
WITH
FLOODWAY
(FEET)
INCREASE
(FEET)
DOSEWALLIPS RIVER
A 1,050 1,023 3,282 5.0 13.2 12.72 12.92 0.2
B 1,750 913 3,802 4.3 16.5 16.5 17.4 0.9
C 2,470 124/2103 2,599 6.3 19.2 19.2 19.9 0.7
D 3,190 1,357 3,559 4.6 22.7 22.7 23.7 1.0
E 3,890 1,102 3,535 4.6 26.9 26.9 27.7 0.8
F 4,330 302 2,064 7.9 28.4 28.4 29.2 0.8
G 5,190 358 1,744 9.3 34.1 34.1 34.1 0.8
H 6,450 182 1,570 10.4 42.0 42.0 43.0 0.0
I 7,020 378 3,647 4.6 49.1 49.1 49.1 0.0
J 7,538 470 5,226 3.2 49.6 49.6 49.6 0.0
K 9,098 605 1,752 9.5 51.2 51.2 51.3 0.1
L 11,020 610 3,369 4.9 60.7 60.7 61.2 0.5
M 12,670 600 2,377 7.0 68.7 68.7 68.8 0.2
N 13,661 442 2,096 7.9 72.8 72.8 73.4 0.7
O 14,649 157 1,104 14.8 77.2 77.2 77.2 0.0
P 15,521 184 1,441 11.3 83.4 83.4 83.4 0.0
Q 16,174 179 1,421 11.5 85.9 85.9 85.9 0.0
R 17,180 201 1,363 11.8 93.8 93.8 93.8 0.0
S 18,047 185 1,611 10.0 98.3 98.3 98.3 0.0
T 18,853 79 846 18.8 109.2 109.2 109.2 0.0
1Feet above confluence with Puget Sound 3Left Channel/Right Channel 2Elevation computed without consideration of backwater from Puget Sound
T
A
B
L
E
2
4
FEDERAL EMERGENCY MANAGEMENT AGENCY
JEFFERSON COUNTY, WA
AND INCORPORATED AREAS
FLOODWAY DATA
DOSEWALLIPS RIVER
92
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION (NAVD88)
CROSS SECTION DISTANCE1 WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET)
WITHOUT
FLOODWAY
(FEET)
WITH
FLOODWAY
(FEET)
INCREASE
(FEET)
DUCKABUSH RIVER
A 1,150 1,071 5,679 1.8 15.3 12.83 13.83 1.0
B 1,215 90/1102 1,502 6.6 15.3 12.53 13.53 1.0
C 1,280 1,053 7,631 1.3 15.3 13.53 14.53 1.0
D 2,310 336 1,556 6.4 15.3 13.73 14.53 0.8
E 3,325 166 1,021 9.8 16.0 16.0 16.9 0.9
F 4,605 143 1,280 7.8 20.0 20.0 20.9 0.9
G 5,955 209 1,498 6.7 23.2 23.2 23.8 0.6
H 7,175 198 1,237 8.1 26.2 26.2 26.5 0.3
I 9,125 351 1,720 5.8 33.4 33.4 34.0 0.6
J 11,275 228 1,388 7.2 42.3 42.3 43.0 0.7
K 12,875 196 1,154 8.6 49.6 49.6 50.3 0.7
1Feet above confluence with Hood Canal 3Elevation computed without consideration of backwater from Puget Sound
2Left Channel/Right Channel
T
A
B
L
E
2
4
FEDERAL EMERGENCY MANAGEMENT AGENCY
JEFFERSON COUNTY, WA
AND INCORPORATED AREAS
FLOODWAY DATA
DUCKABUSH RIVER
93
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION (NAVD88)
CROSS SECTION DISTANCE1 WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET)
WITHOUT
FLOODWAY
(FEET)
WITH
FLOODWAY
(FEET)
INCREASE
(FEET)
LITTLE QUILCENE RIVER
A 1,440 540 1,200 1.0 13.3 12.82 13.82 1.0
B 2,331 96 427 5.2 22.5 22.5 23.3 0.8
C 2,801 76 384 5.8 24.8 24.8 25.8 1.0
D 3,236 70 341 6.5 27.9 27.9 28.9 1.0
E 3,826 80 309 7.2 34.7 34.7 35.5 0.8
F 4,426 126 476 4.6 41.0 41.0 42.0 1.0
G 4,536 55 312 7.1 43.1 43.1 44.1 1.0
H 4,581 120 372 6.0 44.7 44.7 44.7 0.0
I 4,703 39 329 6.7 46.0 46.0 46.9 0.9
J 4,818 142 822 2.7 47.2 47.2 47.8 0.6
K 5,418 50 269 8.2 47.6 47.6 48.7 1.0
L 6,298 59 229 9.7 60.1 60.1 60.5 0.4
M 7,748 95 330 6.7 83.9 83.9 84.9 1.0
N 9,348 65 288 5.5 95.9 95.9 96.4 0.5
O 9,558 48 234 6.8 99.9 99.9 99.9 0.0
P 9,608 28 134 11.9 101.3 101.3 101.4 0.1
Q 10,288 54 216 7.4 112.1 112.1 112.7 0.6
R 11,938 42 162 9.9 140.3 140.3 140.5 0.2
S 13,338 55 221 7.2 164.1 164.1 164.9 0.8
T 14,638 38 192 8.3 182.7 182.7 182.8 0.1
U 16,118 32 146 10.9 211.3 211.3 211.3 0.0
1Feet above confluence with Quilcene Bay 2Elevation computed without consideration of backwater from Quilcene Bay
T
A
B
L
E
2
4
FEDERAL EMERGENCY MANAGEMENT AGENCY
JEFFERSON COUNTY, WA
AND INCORPORATED AREAS
FLOODWAY DATA
LITTLE QUILCENE RIVER
94
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION (NAVD88)
CROSS SECTION DISTANCE1 WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET)
WITHOUT
FLOODWAY
(FEET)
WITH
FLOODWAY
(FEET)
INCREASE
(FEET)
MARPLE CREEK
A 200 23 38 7.3 13.5 13.5 13.5 0.0
B 322 115 81 3.4 15.3 15.3 15.8 0.5
C 567 27 40 7.0 18.5 18.5 18.5 0.0
D 800 35 57 4.9 21.8 21.8 21.8 0.0
E 1,024 47 171 1.6 32.6 32.6 32.6 0.0
F 1,382 27 77 3.6 37.8 37.8 37.9 0.1
G 2,497 22 38 7.5 74.3 74.3 74.4 0.1
1Feet above confluence with Puget Sound
T
A
B
L
E
2
4
FEDERAL EMERGENCY MANAGEMENT AGENCY
JEFFERSON COUNTY, WA
AND INCORPORATED AREAS
FLOODWAY DATA
MARPLE CREEK
95
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION (NAVD88)
CROSS SECTION DISTANCE WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET)
WITHOUT
FLOODWAY
(FEET)
WITH
FLOODWAY
(FEET)
INCREASE
(FEET)
SALMON CREEK
A 7001 100 569 4.7 10.6 10.03 10.03 0.0
B 1,2701 247 1,207 2.2 10.6 10.43 10.63 0.2
C 1,3451 115 532 5.0 10.6 10.43 10.63 0.2
D 1,4201 245 903 2.9 10.7 10.7 10.8 0.1
E 2,1001 365 1,180 2.3 11.0 11.0 11.4 0.4
F 2,8001 325 670 4.0 11.6 11.6 12.4 0.8
G 3,3501 239 442 6.0 16.2 16.2 16.9 0.7
H 3,8501 84 136 6.7 20.1 20.1 21.0 0.9
I 4,8401 58 119 7.7 31.6 31.6 31.7 0.1
J 5,5501 47 161 5.7 37.2 37.2 37.2 0.0
K 5,6901 38 99 9.3 38.1 38.1 38.1 0.0
SNOW CREEK
A 5002 191 483 3.6 18.5 18.5 19.5 1.0
B 1,4902 206 365 4.8 25.9 25.9 25.9 0.0
C 2,2102 200 478 3.6 29.9 29.9 30.6 0.7
3Elevation computed without consideration of backwater from Port Discovery Bay 1Feet above confluence with Discovery Bay 2Feet above confluence with Salmon Creek
T
A
B
L
E
2
4
FEDERAL EMERGENCY MANAGEMENT AGENCY
JEFFERSON COUNTY, WA
AND INCORPORATED AREAS
FLOODWAY DATA
SALMON CREEK – SNOW CREEK
96
Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams
[Not Applicable to this Flood Risk Project]
6.4 Coastal Flood Hazard Mapping
Flood insurance zones and BFEs including the wave effects were identified on each transect
based on the results from the onshore wave hazard analyses. Between transects, elevations were
interpolated using topographic maps, land-use and land-cover data, and knowledge of coastal
flood processes to determine the aerial extent of flooding. Sources for topographic data are
shown in Table 23.
Zone VE is subdivided into elevation zones and BFEs are provided on the FIRM.
The limit of Zone VE shown on the FIRM is defined as the farthest inland extent of any of these
criteria (determined for the 1% annual chance flood condition):
•The primary frontal dune zone is defined in 44 CFR Section 59.1 of the NFIP
regulations. The primary frontal dune represents a continuous or nearly continuous
mound or ridge of sand with relatively steep seaward and landward slopes that occur
immediately landward and adjacent to the beach. The primary frontal dune zone is
subject to erosion and overtopping from high tides and waves during major coastal
storms. The inland limit of the primary frontal dune zone occurs at the point where there
is a distinct change from a relatively steep slope to a relatively mild slope.
•The wave runup zone occurs where the (eroded) ground profile is 3.0 feet or more below
the 2-percent wave runup elevation.
•The wave overtopping splash zone is the area landward of the crest of an overtopped
barrier, in cases where the potential 2-percent wave runup exceeds the barrier crest
elevation by 3.0 feet or more.
•The breaking wave height zone occurs where 3-foot or greater wave heights could occur
(this is the area where the wave crest profile is 2.1 feet or more above the total stillwater
elevation).
•The high-velocity flow zone is landward of the overtopping splash zone (or area on a
sloping beach or other shore type), where the product of depth of flow times the flow
velocity squared (hv2) is greater than or equal to 200 ft3/sec2. This zone may only be used
on the Pacific Coast.
The SFHA boundary indicates the limit of SFHAs shown on the FIRM as either “V” zones or
“A” zones.
Table 26 indicates the coastal analyses used for floodplain mapping and the criteria used to
determine the inland limit of the open-coast Zone VE and the SFHA boundary at each transect.
Table 26: Summary of Coastal Transect Mapping Considerations
[Not Applicable to this FIS Project]
97
6.5 FIRM Revisions
This FIS Report and the FIRM are based on the most up-to-date information available to FEMA
at the time of its publication; however, flood hazard conditions change over time. Communities or
private parties may request flood map revisions at any time. Certain types of requests require
submission of supporting data. FEMA may also initiate a revision. Revisions may take several
forms, including Letters of Map Amendment (LOMAs), Letters of Map Revision Based on Fill
(LOMR-Fs), Letters of Map Revision (LOMRs) (referred to collectively as Letters of Map
Change (LOMCs)), Physical Map Revisions (PMRs), and FEMA-contracted restudies. These
types of revisions are further described below. Some of these types of revisions do not result in
the republishing of the FIS Report. To assure that any user is aware of all revisions, it is
advisable to contact the community repository of flood-hazard data (shown in Table 31,
“Map Repositories”).
6.5.1 Letters of Map Amendment
A LOMA is an official revision by letter to an effective NFIP map. A LOMA results from an
administrative process that involves the review of scientific or technical data submitted by the
owner or lessee of property who believes the property has incorrectly been included in a
designated SFHA. A LOMA amends the currently effective FEMA map and establishes that a
specific property is not located in a SFHA. A LOMA cannot be issued for properties located on
the PFD (primary frontal dune).
To obtain an application for a LOMA, visit https://www.fema.gov/floodplain-management/letter-
map-amendment -loma and download the form “MT-1 Application Forms and Instructions for
Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill”.
Visit the “Flood Map-Related Fees” section to determine the cost, if any, of applying for a
LOMA.
FEMA offers a tutorial on how to apply for a LOMA. The LOMA Tutorial Series can be accessed
at http://www.fema.gov/plan/prevent/fhm/ot_lmreq.shtm.
For more information about how to apply for a LOMA, call the FEMA Map Information
eXchange; toll free, at http://www.fema.gov/online-tutorials.
6.5.2 Letters of Map Revision Based on Fill
A LOMR-F is an official revision by letter to an effective NFIP map. A LOMR-F states FEMA’s
determination concerning whether a structure or parcel has been elevated on fill above the base
flood elevation and is, therefore, excluded from the SFHA.
Information about obtaining an application for a LOMR-F can be obtained in the same manner as
that for a LOMA, by visiting https://www.fema.gov/floodplain-management/letter-map-
amendment-loma for the “MT-1 Application Forms and Instructions for Conditional and Final
Letters of Map Amendment and Letters of Map Revision Based on Fill” or by calling the FEMA
Map Information eXchange, toll free, at 1-877-FEMA MAP (1-877-336-2627). Fees for applying
for a LOMR-F, if any, are listed in the “Flood Map-Related Fees” section.
A tutorial for LOMR-F is available at http://www.fema.gov/online-tutorials.
6.5.3 Letters of Map Revision
A LOMR is an official revision to the currently effective FEMA map. It is used to change flood
zones, floodplain and floodway delineations, flood elevations and planimetric features. All
requests for LOMRs should be made to FEMA through the chief executive officer of the
98
community, since it is the community that must adopt any changes and revisions to the map. If
the request for a LOMR is not submitted through the chief executive officer of the community,
evidence must be submitted that the community has been notified of the request.
To obtain an application for a LOMR, visit https://www.fema.gov/national-flood-insurance-
program-flood-hazard-mapping/mt-2-application-forms-and-instructions and download the form
“MT-2 Application Forms and Instructions for Conditional Letters of Map Revision and Letters
of Map Revision”. Visit the “Flood Map-Related Fees” section to determine the cost of applying
for a LOMR. For more information about how to apply for a LOMR, call the FEMA Map
Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627) to speak to a Map
Specialist.
Previously issued mappable LOMCs (including LOMRs) that have been incorporated into the
Jefferson County FIRM are listed in Table 27.
Table 27: Incorporated Letters of Map Change
[Not Applicable to this Flood Risk Project]
6.5.4 Physical Map Revisions
PMRs are an official republication of a community’s NFIP map to effect changes to base flood
elevations, floodplain boundary delineations, regulatory floodways and planimetric features.
These changes typically occur as a result of structural works or improvements, annexations
resulting in additional flood hazard areas or correction to base flood elevations or SFHAs.
The community’s chief executive officer must submit scientific and technical data to FEMA to
support the request for a PMR. The data will be analyzed and the map will be revised if
warranted. The community is provided with copies of the revised information and is afforded a
review period. When the base flood elevations are changed, a 90-day appeal period is provided. A
6-month adoption period for formal approval of the revised map(s) is also provided.
For more information about the PMR process, please visit http://www.fema.gov and visit the
“Flood Map Revision Processes” section.
6.5.5 Contracted Restudies
The NFIP provides for a periodic review and restudy of flood hazards within a given community.
FEMA accomplishes this through a national watershed-based mapping needs assessment strategy,
known as the Coordinated Needs Management Strategy (CNMS). The CNMS is used by FEMA
to assign priorities and allocate funding for new flood hazard analyses used to update the FIS
Report and FIRM. The goal of CNMS is to define the validity of the engineering study data
within a mapped inventory. The CNMS is used to track the assessment process, document
engineering gaps and their resolution, and aid in prioritization for using flood risk as a key factor
for areas identified for flood map updates. Visit www.fema.gov to learn more about the CNMS or
contact the FEMA Regional Office listed in Section 8 of this FIS Report.
6.5.6 Community Map History
The current FIRM presents flooding information for the entire geographic area of Flood County.
Previously, Flood Hazard Boundary Maps (FHBMs) and/or Flood Boundary and Floodway Maps
(FBFMs) may have been prepared for the incorporated communities and the unincorporated areas
in the county that had identified SFHAs. Current and historical data relating to the maps prepared
99
for the project area are presented in Table 28, “Community Map History.” A description of
each of the column headings and the source of the date is also listed below.
•Community Name includes communities falling within the geographic area shown on the
FIRM, including those that fall on the boundary line, nonparticipating communities, and
communities with maps that have been rescinded. Communities with No Special Flood
Hazards are indicated by a footnote. If all maps (FHBM, FBFM, and FIRM) were
rescinded for a community, it is not listed in this table unless SFHAs have been identified
in this community.
•Initial Identification Date (First NFIP Map Published) is the date of the first NFIP map
that identified flood hazards in the community. If the FHBM has been converted to a
FIRM, the initial FHBM date is shown. If the community has never been mapped, the
upcoming effective date or “pending” (for Preliminary FIS Reports) is shown. If the
community is listed in Table 28 but not identified on the map, the community is treated
as if it were unmapped.
•Initial FHBM Effective Date is the effective date of the first Flood Hazard Boundary Map
(FHBM). This date may be the same date as the Initial NFIP Map Date.
•FHBM Revision Date(s) is the date(s) that the FHBM was revised, if applicable.
•Initial FIRM Effective Date is the date of the first effective FIRM for the community.
•FIRM Revision Date(s) is the date(s) the FIRM was revised, if applicable. This is the
revised date that is shown on the FIRM panel, if applicable. As countywide studies are
completed or revised, each community listed should have its FIRM dates updated
accordingly to reflect the date of the countywide study. Once the FIRMs exist in
countywide format, as Physical Map Revisions (PMR) of FIRM panels within the county
are completed, the FIRM Revision Dates in the table for each community affected by the
PMR are updated with the date of the PMR, even if the PMR did not revise all the panels
within that community.
Table 28: Community Map History
Community Name
Initial
Identification
Date (First
NFIP Map
Published)
Initial FHBM
Effective
Date
FHBM
Revision
Date(s)
Initial FIRM
Effective
Date
FIRM
Revision
Date(s)
Hoh Indian Tribe*
Jefferson County
Unincorporated Area 6/21/1977 6/21/1977 N/A 7/19/1982
City of Port
Townsend 6/14/1974 6/14/1974 1/09/1976 3/15/1982
Quinault Indian
Nation*
*This community does not have map history prior to the first countywide mapping
100
SECTION 7.0 – CONTRACTED STUDIES AND COMMUNITY COORDINATION
7.1 Contracted Studies
Table 29 provides a summary of the contracted studies, by flooding source, that are included
in this FIS Report (FEMA 1981).
Table 29: Summary of Contracted Studies Included in this FIS Report
Flooding Source
FIS Report
Dated Contractor Number
Work
Completed
Date
Affected
Communities
Big Quilcene River
(left overbank), Big
Quilcene River (Main
Channel), Big
Quilcene River
(Upstream Reach),
Chimacum Creek,
Dosewallips River,
Duckabush River,
Little Quilcene River,
Marple Creek, Port
Townsend Creek,
Salmon Creek, Snow
Creek
January 19,
1982
CH2M Hill
Inc. H-4600 May 1979
Jefferson
County and
Unincorporated
Areas
Strait of Juan de
Fuca, Admiralty Inlet,
and Port Townsend
Bay
September 15,
1981
CH2M Hill
Inc. H-4600 July 1980 City of Port
Townsend
7.2 Community Meetings
The dates of the community meetings held for this Flood Risk Project and any previous Flood
Risk Projects are shown in Table 30. These meetings may have previously been referred to by
a variety of names (Community Coordination Officer (CCO), Scoping, Discovery, etc.), but
all meetings represent opportunities for FEMA, community officials, study contractors, and
other invited guests to discuss the planning f or and results of the project.
101
Table 30: Community Meetings
Community FIS Report Dated Date of Meeting Meeting Type Attended By
Jefferson County and
Incorporated Areas TBD 08/19/15 Flood Risk
Review
STARR, FEMA, Washington DNR, and Jefferson
County, Hoh Indian Tribe, and City of Port
Townsend
Jefferson County and
Incorporated Areas TBD 01/23/13 Project
Discovery
STARR, FEMA, Washington DNR, and Jefferson
County, Hoh Indian Tribe, and City of Port
Townsend
Jefferson County
Unincorporated areas,
City of Port Townsend
01/19/82 01/13/77 Open meeting
CH2M Hill, FEMA, Jefferson County Commission
and Planning Dept., City of Port Townsend, and
Washington State Dept. of Ecology
Jefferson County
Unincorporated areas,
City of Port Townsend
09/15/81 04/17/79 Intermediate
coordination
FEMA, the study contractor, and the community
Jefferson County
Unincorporated areas,
City of Port Townsend
01/19/82 08/02/77 Final
coordination
FEMA, the study contractor, and Jefferson
County
102
103
SECTION 8.0 – ADDITIONAL INFORMATION
Information concerning the pertinent data used in the preparation of this FIS Report can be
obtained by submitting an order with any required payment to the FEMA Engineering Library.
For more information on this process, see http://www.fema.gov.
The additional data that was used for this project includes the FIS Report and FIRM that were
previously prepared for Jefferson County (FEMA 1982) and the City of Port Townsend, (FEMA
1981). Table 31 is a list of the locations where FIRMs for Jefferson County can be viewed.
Please note that the maps at these locations are for reference only and are not for
distribution. Also, please note that only the maps for the community listed in the table are
available at that particular repository. A user may need to visit another repository to view
maps from an adjacent community.
Table 31: Map Repositories
Community Address City State Zip Code
Hoh Indian Tribe 2483 Lower Hoh Road Forks WA 98331
Jefferson County
Unincorporated Area
1820 Jefferson Street Port Townsend WA 98368
City of Port
Townsend
City Hall
250 Madison Street
Suite 2
Port Townsend WA 98368
Quinault Indian
Nation
807 5th Avenue
Suite 3
Taholah WA 98587
The National Flood Hazard Layer (NFHL) dataset is a compilation of effective FIRM databases
and LOMCs. Together they create a GIS data layer for a State or Territory. The NFHL is updated
as studies become effective and extracts are made available to the public monthly. NFHL data can
be viewed or ordered from the website shown in Table 32.
Table 32 contains useful contact information regarding the FIS Report, the FIRM, and other
relevant flood hazard and GIS data. In addition, information about the state NFIP Coordinator and
GIS Coordinator is shown in this table. At the request of FEMA, each Governor has designated
an agency of State or territorial government to coordinate that State's or territory's NFIP activities.
These agencies often assist communities in developing and adopting necessary floodplain
management measures. State GIS Coordinators are knowledgeable about the availability and
location of state and local GIS data in their state.
Table 32: Additional Information
FEMA and the NFIP
FEMA and FEMA
Engineering Library website
https://www.fema.gov/national-flood-insurance-program-flood-
hazard-mapping/engineering-library
NFIP website http://www.fema.gov/national-flood-insurance-program
NFHL Dataset http://msc.fema.gov
Table 32: Additional Information (continued)
FEMA Region X Federal Regional Center, 130 228th Street SW.
Bothell, WA 98021-9796
(425) 487-4657
Other Federal Agencies
USGS website http://www.usgs.gov
Hydraulic Engineering Center
website
http://www.hec.usace.army.mil
State Agencies and Organizations
State NFIP Coordinator State National Floodplain Insurance Program (NFIP)
Coordinator
Daniel Sokol
Washington Department of Ecology
P.O. Box 47775
Olympia, WA 98504-7775
(360) 407-7253 FAX (360) 407-2305
dsok461@ecy.wa.gov
State GIS Coordinator State GIS Coordinator
Joy Paulus
Department of Information Services
1110 Jefferson St. SE
Olympia, WA 98504-2445
Phone: 360.902.3447
Cell: 360.628.2621
joyp@dis.wa.gov
SECTION 9.0 – BIBLIOGRAPHY AND REFERENCES
Table 33 includes sources used in the preparation of and cited in this FIS Report as well
as additional studies that have been conducted in the study area.
104
Table 33: Bibliography and References
Citation
in this FIS
Publisher/
Issuer
Publication Title,
“Article,” Volume,
Number, etc. Author/Editor
Place of
Publication
Publication
Date/
Date of
Issuance Link
(FEMA
1982)
FEMA Map Service
Center
Jefferson County
Effective FIRM/FIS FEMA Oakton, VA January 1982 https://msc.fema.gov/
(FEMA
1981)
FEMA Map Service
Center
City of Port Townsend
Effective FIRM/FIS FEMA Oakton, VA September
1981 https://msc.fema.gov/
(U.S.
Census
Bureau
2013)
U.S. Census
Bureau Population Estimates U.S. Census
Bureau Website 2013 http://factfinder.census.gov
(TAC.
2002) Van der Meer, J.W Wave Run-up and
Overtopping at Dikes
Technical
Advisory
Committee for
Water Retaining
Structures
The
Netherlands 2002
(NOAA
2004)
NOAA Center for
Tsunami Research
Strait of Juan de Fuca 5
arc-second
NOAA Center for
Tsunami
Research
May 1, 2004 www.ngdc.noaa.gov/mgg/inun
dation
(FEMA
2007) FEMA Flood Insurance Study
Study Whatcom County FEMA Washington
D.C.
November
16, 2007
(FEMA
2007) FEMA Flood Insurance Study
Study Island County FEMA Washington
D.C.
February 2,
2007
(USGS
1982)
Interagency
Advisory
Committee on
Water Data
Guidelines for
Determining Flood
Floow Frequency-
Bulletin 17B of the
Hydrology Subcommitte
USGS, office of
Water Data
Coordination
Washington
D.C 1982
105
Table 33: Bibliography and References (continued)
Citation
in this FIS
Publisher/
Issuer
Publication Title,
“Article,” Volume,
Number, etc. Author/Editor
Place of
Publication
Publication
Date/
Date of
Issuance Link
(USGS
1988)
Sumioka, S.S.,
Kresch. D.L. and
Kasnick, K.D.
Magnitude and
Frequency of Floods in
Washington
USGS Water-
Resources
Investigations
Report
Washington
D.C 1988
(USGS) Ries III, K.G., 2007
The national streamflow
statistics program: A
computer program for
estimating streamflow
statistics for ungagged
sites
USGS
Techniques and
Methods 4-A6,
37p
2007
(USACE
2010)
Hyrdologic
Engineering Center
HEC-RAS (Version
4.1.0) River Analysis
System, User’s Manual
USACE Davis, CA January 2010
(FEMA
2014) FEMA
53031C Jefferson
Terrain Data Project
Narrative
FEMA Washington
D.C
February 25,
2014
(USACE
2006) Chin, David A.
Water Resources
Engineering, Second
Edition, Upper Saddle
River
USACE Prentice Hall
NJ 2006
(USGS
1967) Barnes, harry H
Roughness
Characteristics of
Natural Channels
USGS Washington
D.C 1967
106