HomeMy WebLinkAbout999700031 Drainage Report/ .
MAtdLEARNSBERRY,
Civil Engineers :-' Land Surveyors ,e Planners
Geoloo~ists c, Environmental Scientists
("'"~ TEAl. £,:\KE V!I,LAGE DIYIS!ON I! (PHA. ~
l):.cW, lre(i ~o)':
.la~uar.~. 1906
MACLEARNSBERRY. INC,
~'.V'.L E,%G.N~EnS "L,'~."~D SLJt~',/E'"'O''~5 -
:5-2 ',,.,',.t.'," ,"-,oz'~v
.~_T. OR.Xl .DRAINAGF'_. REPORT
FOR
TEAl.. LAK_E ViLLAG'£ DI¥I~ION II t~H_ASE
I. Introduction:
Pope Resourc~:s is proposing to develop thc single-family subdi:'ision of Tea! Lake VillaS_-'
Division ii. on the south side of Pot, Ludlov,' Bay. A Pretiminar'.,' Pla,. has .beer', appro;'¢d bv
Jer'forson CounLv and i; is the intent of the I)e:'¢toper to conduct fi~! ,.,--;.,~, ara s;te
improvements in the Spring of 1996 in order to have.lots availabf¢ to the public b)' d".e Summer
~.a~ V:IIa,_,e Division Ii 1i¢~. [?redomin=[¢ty. ir', .:kc
The proposed plat of Tcai ~ ' '
and :he southe=s~-quartcr of $~cdon l] Township 2S .',,'o~h. R=n~e t Ea.-t. w ~ h :s ~'
. , , . ..:,,.,..
on ~he north by the plats et' Teal Lake ',,'itlage Divis;en I and Faw, voed x, ~,,a~,.:. on uh¢
· ,,he preliminary plat of Springwocd. and on the south and ea.~t bt,' unptattcd PcFe
lands. ,. · · '
The site straddles the Teal Lake Road and contains a total o~' ~ 10.27 acres of I',nd i Sa acres
of ,.~'hich lies east of the road in Phase !. with the remaining 38.38 acres in Phase !I. wes: c:
the Teal Lake Road. Ground cover consists of small second growth, mixed con:','ercus and
deciduous cover.
Phase t lies. predeminateiy ateng a north-south running ridge. The land falls away to the ',;cs:.
toward the Teal Lake Re, ad at sloues of eight to ten percent. The more irregular ternin
east falls tov,'ard a ravine at slopes upwards of eight to twenty ~ercent. The gently
rid~eiine rises from an elevation of .i 10'. at the project entrance on the Teal Lake Road. to aSO'.
at t~q,: fiat ridgetop.some 2600 feet to the southeast
·
According to :he SCS Soil Surx'ey of Jefferson County thc .soil t,,pe coverin< thc titc
Cassolary. which falls in HydrolOgic Group C.
.!
III. _Pr o_gj_e.c t
The proposal consists of a 36 lot subdivision v/ith the main access off the To:ti Lake
running along the center of the ridge and culminating in a ~rn around at the ~.op of t?m r:.dg-:.
some 2750 feet to the southeast. The southerty extension of Crestview Drive ',,,'itl
Teal Lake Village Div. I approximateiy 300 feet in from the entrar~ce and a 450 foot long cul-
de-sac extends from the main road at approximately station
When completed, the 36 lots will cover approximately 57,c of thc site and r",,.',-" :n
0.8 acre to 1.6 acres.
~'v' E... __xi~sxin~ Dr_a~°ns''
~e Dr-,ina~e Basin:
The aforementioned ridge divid,'s storm water runoff from Phase I. Stom~ ..t'a:~r .,'unot.'.
t~e east side of t~e ridge drains to the north-flowing ravine, wh:ch mr3 along tke
bo,:ndarv nf the plat. Runoff from the west side of the ridge is further divi.:ed. Thc
portion ~f the runoff from the ,.,.'est side of the ridge flows to the Teal Lake Road, arc
northwesterly ir: the roadside ditch to the creek which runs north, t.'.,rough the Port.I.ad!ow G~if
Course. 'Fine northerly p,x.-tion or' the sub-basin flows, naturally, into :h'¢ ra,.-ir'x...,..~iz~ ,-'ur,..s.
nc~herly, along the east side of Teat Lake Village Division I.
. . (7e
r>. S,t," Dra~na_ :
Due to thc ia.,,' of the !and. the large amount of natural even space, the fact ~he ihat mc, s: ct'
proposed tots lie along d,,e ridgetop, and size of tt:e lots, most of which wilt remain ia
natural state, thc predomimnce of '&e project site will not be affected by land clearing ac::vities.
Most of the site will continue to drain as in its undeveloped condition. 'Fnerefore. cab' tM:
poaion of the site. which will actually be disturbed, will .be addressed in the draip~ge ar,-~iysis.
V. Down.5!ream Drai~ditio,s:
The primau stream flowing into the Ludlow Bay drainage basin is Ludlow Creek. whicin drains
~he bulk of the Chimicum Valle.',' and culminates at the head of Port Ludlow Bay. The
flowing stream in the valle>' in which the Port Ludlov,' Golf Course lies. and a series ot steep
ravine:., drain into the south side of Port Ludlow Bay. east of Ludlow Creek. All of these
drainage sub-basins flow through large culv¢,qs, under thc Port Ludlow - Paradi'se Ba.,,' Rca,'*. and
..
on into the bav through well defined channels.
.,:
.,
:i
.!
· ~
VI. _l:Z:r.~ Draina-ag.~r°ve'nentg:
A. OFF-SITE. UPSTREA*!
Off-site. upstream, drai.,mge all flows in from south along the aforementioned easterly ravine a:xl
the Teal Lake Road ditches and bypasses the project site. Accordingly. this runoff does not
affect the project and will not be addressed further.
B. ON-SITE DRAINAGE
'Jefferson County (by ,,'irtue of ifs reference 'to the DOE Manual). requires detention of t,% 2-
year. lO-year an,. 100-year. 2a-hour storm events, with a release rate equal to one-half of
2-year storm discharge quantity, under undeveloped conditions. In addition, the DOE Manual
. ' " ;' ' for ~h,- 6-mos
retluires storm water quality conr. rol in the form biofi!tration, or storage cap,.c..? .....
2,1:hour storm event (0.6-1, of the 2-year storm
It is anticipated that the 36. approximately one-acre, lots in the project wiS! be tmproved to, or.!y
a distance of about l(Y3-feet back from the street. For purposes of this repoa it will ~e assgmed
that the entire width of each lot ,.,,'ill be cleared factually clearing ,.vi!; pro~abty net
extensive). This beam' the case. total lot ctearin~ will amoum to !5.69 acres, or 0,.I'~6 acre per
lot. Fuahe.'-more. 4.5'2 acres of road riel:t-of-way :,.'ill bc cleared, for a to. tal of 20.21 acres to
be cleared out of the total 7! .89 acres in Phase I.
Of the 0.4-! acre of cleared area per lot. ~t is anticipated that there will be 46~00 square feet. or
0.09 acre of impervious area in the form of buildings, driveways, patios and side :.vaiks. this
leaves 0.36 acre per lot for lawn and landscaping.
The dev::!oped site wilt divide into two sub-basins, each one draining to a separate d¢:er, t~ep.
facili:y. For purposes of this report these sub-basins will be described as Sub-basin A and Sub-
basin B. Their characteristics are described as follows:
$ ,...~_4b~.o_a s_..j n A:
_ ......... ~....5.,55-:~v:: ....
D,..w. ription: 31 lots consisting.-~:ff'TSf~-I through 9 and 'Lots !5
Of these tots. drainage from the building sites on Lots 6. 8 and 9. 2'~ ti'trough 3a cannot 'be
intercepted, either directly or indirectly, by the roadside ditch system and will h,'~'e to ha~,'e
individual infiltration systems designed and constructed at the time of individual, house
cons't:'-uction on r. he lots. Therefore. drain,'ige"from 28 buildine s~tes-x ,~I be directed to ihe Su~-
basin A detention facility:
0.435 acres,'lot x 16 I:)ts = 6.96 acr'.'.s (lrainin~,.: to detention facilities.
0.09 acrcllot × 16 lots = 1.4.1 acre.'; comloincd lot imperviou~
6.96 acres - 1.44 acres = 5.52 acres combined lot pervious area I De':,'.lcFcd
Road System' There are 4.34 acres of road r~ght-of-way in Sub-basin :\ of whic~ 1.92
acres will ~c paved.
Right-of-way area in pe~ious area = ~ 3~ - ~ 92 = ~ ac:es.
Total impervious area = I.~ acres ~lms~ ~ 1.92 acres ~roads~ ~ 3.36 ~cres
Total pervious area in la',vns landscaping = ~.52 acres - 2.a2 acr:s = ?.ga acres
Total ~2mrat pe~:ious area ~woods) = 4.31 acres.
Total existing pc~'iou~ area within this ami?sis = 6.96 acres ~ 4.3a acres ~ 31 acres =
I5.6t acres.
...... ~i'~r both ex~'';''° and dc,,'clcccd
([) Time of Concentration Worksheets were vr~t,a.cd ...... = ·
condition:; {see Appendix A-1 and
Four hydrographs ~t-ere created for: tee 2-year. 24-hour storm event and t~c
2a-hour storm event, under existing conditions, and the 2-year. 24-h~)ur sro~ c,,'ent and
thc 100-year. 24-hour sto~ event, under developed conditions ~sec .&pFcndix A-3
~3) The hydrographs for the 2-year. 2a-hour sto~ event and me t~-year. 2a-~cur
event, under developed conditions, using one-half the release rate under
conditions ~O.16 cf{) [or the 2-year event and the full release rat,e under existing
conditions t'or the l~-year event {see Appendix A-5 and A-6} were used to stze
detention pond for t~e sub-basin. The resultant pond was determine'3 to ~e 31 378
feet in volume. ~he top area of the resultant pond is 13.886.9 square fee=. resulting
.
a rectangular pond 84 feet w~de b':' 167 l~et long. T!~e routing data was filed ret
reference tA 1O0.Det).
Finally. the adore mentioned hydrographs for the 2-year and l~-ycar. 2a hour
events (for developed conditions~ were routed through tl~e design Fond using ~he
Reservoir Routing Inflow/Outflow Routine to verify the adequacy of t~e pond volume.
The peak storage calculated out at 31.370 cubic l~ct.
..-, con.strutted at the rime of individual ho se . 'c,.
systems des,_ned and .
. ' ' - . . · ',.,,', 4' ,otheSub-oasmA
Therefore. drainage trrem one build;rig sue .', l,l be, ,trected, -
0.436 acres/lot x 1 lots = 0.4'36 acres draining to detention ' ;'";"
0.09 acre:lot ': I lots = 0,09 acres combt,"',ed lot imper';:ous area,
-..
..
0.436 acre. s - 0.09 acres = 0.346 acres combined lot V-','-viou-s
Road System' There is 0.38 acre of road right.(>f-way in Sub-basin A ,:t' ,.vhic~, r) 2.'
acre ,,,,'ill be paved
Rigi~t-of-way ar,,:a in la:vn = 0,3:¢ - 0.24 -'--- O.;-i acres,
Total impervious area ,-- 0,09 acres (lots) ? 0.24 acrzs ,,roads; = 0.33 acres
Total pervious area in lawns landscaping = 0.3.16 acres - 0. !4 acres = 0 :c~ acres
Total unimproved area draining to de:emion = O.a9 acres
Total existing pervious area within this analysis = 0.38 acres ? 0..:9 acre:; -- 0.-:'9 acres =
t.36 acres.
Time of Concentration Worksi~eets were prepared for b,,'.tl', ex!:,:ing and cc,,¢:c?c~ 5::::
conditions (see Appendix B-I and B-2),
.2) Four hydrographs were created :'or: the 2-year. 2a-hour storm event and rk, e
2,I.-hour storm event, under existing conditions, and the 2-year. 2a-hour s;o~ ::'.'en~ and
,-,-hour storm event, under develoF;ed conditions ~sez ..\~?endix
tt',e tOO-year."
through B-5'l.
(3~ ~hc hydrographs for the 2-year. 2.-t-hour storm event and the lO0-year ..... ,
event, under developed conditions, usin~ one-half the release rate under ex:st:a:::
conditions (0.015 cfs) for the 2-year event and the full release rate under
condit;ons for the 100-year event (see Appendix B-6 and B-7'~ wcrc used to size a
,' for the sub-basin for comparative
detention ponu
purest:,. The resultant pond ,.vas determined to be 2.838 cubic feet in volume. The
area of thc rcsul{ant poPd is 2.082 square feet. resulting ill a r¢ct~n',_'.ular [;,md 3: fcc.:
'"" 1_/5
(4)
wide by 66 t'cet l(m~.
Finally. thc above mentioned hydrographs for fi,: 2-year and lOO-:,':ar. 24 hour 5:o~a
events (for developed conditions) were used to dct~in~ tt~e required length of a four
foot diameter detepuon pi~. Thc required pipe length was de~e~ined to ~ 225,~ lir~l
feet. with a storage capacity of 2829 cubic feet {se= ApFmndix B-8 ar~ B-9).
OFF-DPO, INAGE DOWNSTREAM
Water from the detention pond will discharge into the roadside ditch on the Teal Lake, road;
thence down the Teal Lake road ditch to the Highland Drive intersection.
,,'esterl','. along the ditch adjacent to Highland Drive and iq:o the main norxh-fle',ving stream.
which ~r:tirts the Po~ Lud!m,'.' Golf Course.
VII. Conclusion
~u!es ir. ~he current edition of the State Department o( Ecolog':"s Storm Water Technical
Manual (hereinafter called the Manual) require: that. for a project e~' this magnitude, a
Wa~er Site PIar: be prepared and implemented. This site plan will have ~'a'o =i=mev. ts. an
Erosion and Sediment Control Plan for temporar?' control of pollution ..a.n.,,.d duri:~
construction, and a Permanent Storm Water QualiLv Control Plan for control of poliu:ion from
storm water after construction is completed. The Manual lists eleven Best Map, agorae:''-t
Practices which i:er~ain to this project. These requirements and ~he descriptions their
are listed in Appendix C.
~,iacLearnsberr,,'. Inc.
KING'COUNTY. WASHINGTON, sURFACE WATER DESIGN MANUAL
TABLE 3.52B SCS WES'TERN WASItlNGTON RUNOFF CURVE NUMBERS .
SCS W~S'TERN WASHINGTON RUNOFF CURVE NUMBERS
Runoff curve numt~r.
I
! ~RVE NUMBERS
, HYDROL~;C SOIL
USE DESCRIPTION
74 82
~u~e:
young
w~h c~er
9god cor~ion: grass cover cn 75.%
or more o~ :he area
fair cccd~k',.,n: gra~ cover on 50.%
:o 75% el the area
[m--,.,ec¢,o,,~ surf, aces, pavemem, roo~s, etc.
iOg~ wal~ bodies: lakes, weaar',cJ.s. Por,.ds, etc.
Srn,~e Fam,,Iy Re3idem~al (2)
O,we~ling Ur~,/Gro~ Acre % impervious (3)
:.o OU/GA
1.5 gU/GA 20
2.0 gU/GA 25
2.5 gU/GA 30
3 0 gU/GA 34
38
3.5 gU/GA
4.00U/GA 42
4.5 gU/GA 46
55 gU/GA 50
6.O gU/GA 52
~.s ~u/GA
7.0 gU/GA 56
Pl,~ned un~ developmenls. % impe,wious
condominiums, a~'~rtments, must b<.' compulc~
commarcial business and
industrial
6<3
77
76
72 82 87
~,-~'; 98 4.,v 98-o-'r 98';
Separate curve number
to~ pervious and
impervK3U$ IX)ct, ton
Of U'le S~.8 or b,Bs:n
(~)
I
For a more deb3iled descr,ppon of agricultural land uso curve numbers refer tO t'4,3Bona! Engmeerm,.';
Ha~Jboo, k, Section 4, Hydrology, Chapler 9. August 1972.
(2) A,;.~,tmes rog! and drrvoway runoff is d*rect..'~J into street/sierra syslem
f3)' The remaining p~rvio[J3 areas (lawn) are conskJer'c~ to be in 0o..,:xd condrdon lot ;hese c,J~'e numbers
48
47'
46'
.,..
124
123
__
122
123
122 121
"-~/",'b- ~u ~,. ,~.,. --~ !.
t
I~t , i ~ ~ ...~r-' I ,
~lIJ~ t'~'- .~ ~,L ~ , .-':
', /~ 6 ~--,~ ' _-~ '- .'~:.-~5' i ~ '~'
.... Y .... ~l .' ;;,.; .~ :~
"ifA. t::.~.~,/~ ,-~:.~ 2t -,~.~-.~
491
48
IO0-YEAR
, Ill -- II - ·
· , , -- " '"" I I
124 125 122
. _ _ : ..... 45 _~5 ~!~_~__~_ ,
MacLE3~;SBEREY, .NC.
Wyatt Way NE
Bainbridge Island, WA 98110
(206) 842-5514
TiME CF CONCENTRATION WORKSHEET
BASIN .~
?2--
A (exist)
SHEETFLGW
TYPE
Woods
pROjECT: Teal Lake ';i!:a~ Civ
jOB NO.: 95034
DATE: Ol/10/gg
LENGTH SLOP= "'
300 0.0567 '~-%
';
..
%,
O
Tc
'-.~ 0 1223
Woods ~ ~" '
.... ~m-- SLOPE z 'l 7c
Road ~i-ch ..... ~ -~
98110
PRCJECT: Teal Lake V:ilage Div.
jOB NO.: 95034
DATE: 01/10/96
..... CGNCENT?3:~ ~v~* WORKSHEET
93.27
. .
LENGTH SLOPE N Tc
300 0.0567 0.8 86.68
o ~ ~ 0.CO
A(exist)
SHEETFLOW
?fPE
Woods·
?
· - ;'. Tc
SHALLOW Fl,OW: LENGTH SLOPE
1.5o 0.1233 ~ i .09 2.3'7
Woods .~ o o 0. O0 0. O0
· .~ ~
. '~ ?
· ~ ~ , . 00 .
.
,
MacLE~RNSBERRY, iNC.
159 Wya~ Way NE
Bainbridge island, WA
(206) 842-551%
9~' !0
'FiblE OF' CGNCENTRATION ',IORKSHEET
A(dev)
SHEETFLGW
TYPE
Law?.
Fu,-.--r-? Teal Lake :li!~au~ DL';.
jOB NO.: 95034
DATE: 01/19/96
K '7
S ..~_a~L L O W ..... LENGTH SLOPE
~ .~ ~ ~ 0 .C6
BASIN
iNTEP342 T: LENGTH SLOPE
Road Ditch 800 0.16
MacLE?O2:S BE?.RY, iNC.
~.59 Wyat~ Way NE
Bainbridge island, WA
{206~ 842-5514
2.!7
~. 8C
TOTAL
Tc
Tc
~ .7~
4
6 .L4
l. Fl
23
==~--~- Teal 'ake Villace
jOB NO.: 95034 DATE:
- ~'-~'N WORKSHEET
TiME O:' CCNCENT~w.~_ ~u'.
DATA ?RIMT-OU'r:
15.6
?EAK-Q(CFS)
PERVIOUS iHPI.:!~V ! OUS TC(MiNUTES)
A CN A CN
15.6 81.0 .0 98.0 93.3
T-PEAK(HR5)
VOL(cu-FT)
.--3?- ~. ,'~, 12.50 17666
EHTER r~. ][pathl~[lename[.e:¢t]
b:aPex .hyd
Sp~:c~f' C - CONTINUE, N
t00 24 3 2 .......................
~.,~**~ 100-YEA~ 24_J;(;~iR STORM
................. ,
ENTER: A(PERV), CN(PERV), A(iMPERV), CH(i.4-m.. ), TC
!5 · 61,8]., 0,08,93,39
~{, -OUT:
· ATA PRi'
AREA( ACRES )
15.6
PEA;{
!M?.: HViOUS
A CH A CN
15.6 81.0 .0 98.0
r - ~E '. :¢ ( H ?.:-~ )
,/eL ( CU- F'r )
'1'~' 'Hi NUTES)
93.3
2.05 8.50 82189
[,[:][path]~ilename[ -ct] ~'C:< STORAGE OF COMPUTED HYDRCG~APK'
b:al00ex.hyd
SPECIFY: C - CONTINUE, N - NEWS'r,.J, P - PRINT, S - STOP
').,24,1.5
· .,~.~,~,x~**x-,~ S.C.S. TYt~:< ! ~. 0[STR[BUTIOH
· *'**~'=** 2-YEAR 24-HO~;P STC: F ***x 1,50" TOT,~., ,'REC~}',
~.2.2§,84,3. 16,9:~.,
DATA PRINT-OUT:
AREA(AC~. ::) PERVIOUS IMPERVIOUS
A C.N A CN
15.6 12.3 84.0 3.4 98.0
:,~AK -Q (CF.S.) T" '.; EAK ".'~:~:~)
1.47 7. ~:3 33877
TC(M!NUTES)
'23.7
... ' .-,t} FOR STORAGE OF C:;~'.PU".' .:,':tCGRAPH:
~:NTER Id' ][..9,1~ '" . ?.,:.%me[ _:.
b: a2de'/, hyd
.. ""','" INUE N - H~,gSTO,~4, P - PN~' 0' - STO~'
!00,24,3.Q ---
___.___ ............... .------------ ....------ ........ ------------
~-~*~** 1O,; YEA}. 24-HOUR STORM **~ 3.20" TO'. ..... PRECiP.
E:~TER: A{~':':7:V), CN(PERV}, A' ""ERV~, CN(iMPERV), TC 5'O~ BASIN
34,3.26,98,23.7
DATA PRiN':' i." . '
IMPER:/!OUS TC(MIHUTES)
A
3.3 98.0 23.7
~.';.'ACR;-;) p?:i~', ,OUS
A CN
15.5 12,3 84.0
PZA :: -q (C:.":5) T-PEAK(HRS )
5.81 7.83 10q795
:.")R STORAO:'; OF
'~,:~UTED HYDROGRAPH:
EHTEP. Id' '~,.'.pat' ];'i t.er~ar.;eF .e:<t']
b :al OOd~", '-,
.q;~?..'.:'Y: C - CONTIN'.: . H - N.-'TRSTOP-M, p - PRINT, S - ST- ·
i
PERFOP~MANCE (5 M.:'z [MUE ):
ENTE.R· POND SIDE SLOPE {HORIZ. COMPG~,ENT)
3
ENTER: EFFECTIVE $'r~)EAG: DEPTH(ft) BEFORE OVERFLOW
ENTER Id ][path]~i]enam~ [,ext] OF PR~MAF,'! DESIGN INFLOW HYD.ROGF-APH:
b: al0Odev, hyd
PRi;:,\RY DES~(:N INFLOW PEAK = 5.81 CFS
EN.'.(R ?:~'~ARY DESIGN RELEAS~ RA'~'E(c~s):
2
ENTER NUM;;;':< OF INFLOW H'fDROGRAPHS TO BE TESTF:~
i
~TER [d:][path]f ilensme[.ext] OF HYDROGRAPH 1:
b:a2dev.hyd .., ~ .... ~ATE(c~s):
ENTER TARGET
0.16
. .
ENTER: NUMBER ~,, ;Fi , RT
R!SEF OVERFLOW DEPTH FOR PRIMARY PEAZ i~{FLOW = .54 FT
3?E('~>'y [TERAT!ON DISPLAY' y - YES, N "
34614 CU-FT
D
SPECIFY: H - KETI'F.t~/'~':r''''':: iNPUT, C - CONTINUE
IIt lT!AL STORAGE VAi.UE FOR ITERATION PURPOSES:
BOTTOM ORIFICE: ENTER
a
BOTTOM ORIFICE:
DiA, = 1.96 INCHE?.
TOP OR[FlOE: ~;NT:{R HEiGHT(~t)
2,5
DIA. = .),:~;~ INCHES
pERP'ORMAI~:E: I NFl,O".' TAE,?E'v ~OUTFLOW ACTUAL-OUTFLOW PK-STAGE STORAGE
DESIGN HYO: 5.81 7.05 2.04 3.00 %L37S
TEST HYD ] ' , .47 .16 .16 2.48 2512C
A - ADJUST ORIF, E - ENLARGE, S - S?CF
· ;?gCI ;FY 0 O,,~,,~.EN, , R REV I 5){
.
.
d _
,.
uERFOFJ4ArtC}';' JNFI.OW TARGET'O~';'.'I'~W ACTUAL-OUT}': :" PK STAG~ STORAGE
DESi,;N HYO: b.al. ~.05 ').0,1 3.00 31378
' . ~ r, 2.48 25120
,qF.R-I;~D pOND-BOTTOM-AR.E;s 'r,,~P.; .... ~( @1 ' ?. B, )
8591.8 $0..- ~"t'
ORIFICE RESTRICTOR: DT;,(;NCHES) HT(FEET)
BOTTOM OR!:.' ICE: 1.96 .00
TOP ORIFICE: 9.88 2.50
ROUT lNG F,~'rA:
STAGE(FT)
.00
.30
.60
.90
1.20
1.50
i.80
2.10
2.40
2.50
2.10
3.00
3.10
3.20
3.40
3.50
AVERAGE
DISCH,X'
.00'
.06
.08
.10
.1!
1.~
1.%
16
16
35
05
69
71
95
,40
.00
STORAGE( CU-FT )
..0
2631.0
5~70.0
8219.2
11180.3
14255.5
17446.5
20755.3
24184.0
25353.8
27734.4
31408.4
3 ~:3 {0.9
33927.4
36502 · 9
378!] .9
pE~M-AREA(SQ-FT)
.0
.0
.0
.0
.0
.0
,0
.0
.0
.0
.0
.0
.0
.0
.0
.0
R - RE:/ISE, S - STOP
VERTICAIo p~.:;,:.;E~o? ' .'TY: .0 MiN;{TES/INCH
F FILE, N - NEW JOB, P p! ~'~' r:.:/OF,
[d:][path]fi]ename['ext] FOR STORAGE OF ROUTiN.'
27i
SPECIF"f: F - FILF;. N - NE'4JOB, p - PRINT IF/G:"
R REVISE, S - STOP
3
R,;:S~.~;,':-~IR ROUTING ]N!.:..:W/OUTFLOW ROUTINE
-~.:<,'~::"¢ [4: 1.[p.;: h]Fi [enamel .,:xt] ;F ROUTING DATA
b:a!00 .der
DI.q}'LAY ROUTING DA'"A (Y
~ 3UT i ~<r.: DA'FA:
STh,':l.i(t:T) DISCHARGE(CPS) $'1'~,- ':~:f "':' ~T) PERM~AREA($Q-FT)
.00 .00 .0 .0
.30 .06 263i.0 .0
.60 .08 5370.0 .0
· 90 . i0 8219.2 .0
i. 20 .11 '. L.~O · 3 .0
~ ~m .!~. ].4255.5 ,0
i. ~0 . ].4 17446.5 .0
2.10 .15 20755.3 .0
2.40 1.6 24184.0 .0
2 50 ~6 25 ~',3.8 .0
2. ,"0 i. ~$ 27734.4 "-'
3. Or: 2.05 3] 4G8..: .0
3 .i0 2.69 32660.9 .0
3.20 3.7! 33927.4 .0
3. ;0 4.95 ~'~)08.1 .0
3.40 6.40 36502.9 .0
3.50 8.00 ~/:) Li. 9 .0
3.60 ~. 56 391~.5.3 .0
A'; :.\~;E PERM
.0 H [NUTE$/INCH
ENTER Id:][path]fi lena~. ~.r .e×t] ~" COM:'".;TED HYDROGRAPH:
". :al 'Ode't.
· ',':LOW/OUTFLOW ANgI,Y::':::
PEAK- I ?:" ' CF" ) PEAK-OUTF'I,GW ("~ "" )
5.81 2.04
iNiTIA} ,,':'~. :E(F'i') TIME-OF-PEAl.' ' .q)
· 00 9.50
OUTFLOW-'/ ' 'CU-FT)
107043
PEAK-STAGE-ELEV(FT)
~.00
PEAK STORAGL: 3!~¢'/,~ CU-;.'
.
ENTER rd:'fvn,- 'fit ,.'~ame[ "'"t~
.',~R :-~'t'ORAGE OF COb
,,',':.:I) HYDROGRAPH:
.L
RESERVOIR ROUTING INFLOW/OUTFLOW ROUTINE
SPECIFY [d.l[path]filename[.ext] OF POUTING OATA
A:AIOO.0ET
DISPLAY ROUTING DATA (Y or N)?
Y
ROUTING DATA'
STAGE ,,' FT )
.00
.60
.gO
~.20
J.50
! .80
2.!0
2.40
2.50
2.70
3.00
3.20
3.~0
3.40
2.5-0
3.50
DISCHARGE(CFS
.00
.06
.08
.10
.11
.13
.14
.~§
.15
~.35
2.05
2.69
3.71
4.95
6.40
8.00
g.56
AVERAGE PERM-RATE:
STORAGE (CU-FT) pERH-AREA(SG-FT
.0 .0
2631.0 .0
5370,0 .0
821g.2 .C
11130.3 ,O
14255.5 .0
17446,5 .0
20755.3
24184.0 .0
25353.8 .0
27734.4 .0
31408.4 .0
32560.9 .O
33927.4 .0
35208.~ .0
36502.9 .0
3781~.9 .0
3g135.~ .O
.0 H ,.' NUT ES/i,'(CH
ENTER [d:][msth]filename['ext] OF COMPUTED HYDRCGRAPH:
INFLOW/OUTFLOW ..... /':'rS'
pEAK-I NFLOW(CFS} PEAK-OUTFLOW/C~S)
~ .47 ,16
ZN~TIAL-STAGE(FT) TIHE-OF-PEAE(H~S)
,00 24.33
CUTFLOW-VOL(CU-FT)
31847
PEAK-STAGE-EL EV ~ FT )
2.48
PEAK STORAGE' 25120 CU-FT
~,,T-~ [d.][path]filename[ ext] FOR STORAGE OF COMPUTED HYDRCGRAPH:
~C
C' \HYD)
I.
- .
,-: '.;."..,. ~,Z'
-.'i:T i~ ?'/:.-<'.::'. !
' '":.,t ,-,~,:~: -_'._:.:MacLEAP&~SBERRY, iNC.
,..~?,',,:i?:::':t:: ~ 1.59 Wi,'a:: Way NE
..-~:!~.,':".:t':'.'.?~.l Bainbridge Island, WA
(206) 842-5514
...
,.,'.~ . · ,', ·
.
.
98110
T:ME OF CONCENT-~T!C~! WORKSHEET
-. ·
_
.-
BASIN
B {exist)
SHEETFLOW
TYP?
7;ccdS
PROJECT: Teal La>~ Vi~ lac'~ DL'z
jOB NO.: 95024
DATE: 0!/i0/9~
./
C OC
LENGTH
300
.)
. --
Tc
TiME .OF CONCENT?.AT!CN wORKSKEEi
B (de:z)
1.5
SKEETFLOW
TY.=E
Lawr.
'3
pROJECT: Teal Lake Vii~age Div.
jOB NO.: 95034
DATE: G!/10/96
LEI;GTH SLOPE
180 0.1389
BASIN
Road DJ:ch 250
TOT.:~
1
S.C.S. TYPE-IA RAIHFALL DISTRIP. UTIO~t
ENTER: FR.--.Q(YEA'~{}, UURATi:~:{(HO'IR), PRECIP([HCHES)
2,24,1.5 ................................
t*******~ 2-YEAR 24-HOU}: STO~-M **~* 1.50" TOTAL PRECiP.
EH'r}.ik A~=ERV), CN(PERV), A(IMPER'-;), CH<iMPERV), TC FOR BAS!~I
!.36,81,0,9:{'61 .9~
DATA pKINT-OUT:
AREA ( ACRES ) ?.~]R V ! OU S
A CN
1.4 i. 4 81.0
~2AK-Q (C:"5) :' :?EAK( HR.5 )
~ ,.~. o, ° ,12.50
iMPERViO~3$
A CN
.0 98.0
v,,.,(,::;-s~ )
1544
TC { Mi NU':'?-..
61.9
/ETJTER Id: ][.oath] ( ~ ::%ame[ .e:¢t: ,"~]~{ :~'?ORAGE OF C_M b:b2ex.hfd
SPECIFY' C - CO~iTINUE, N - H~S'i'OH:~, P ' PRINT, S STOP
S C S ~PE-1A RAINFALl, D]?:'RiBUq'iOI4 .
EM.~.:<R: F~EQ('fEAR), DURATICH(HOUR) ~'=C" . .~HES)
2102 .................................
' ' ............................... % % k
********************* S.C.S. ~"{PE-kA DISTR!BUTiOH
********* 2-Y~AR ]O-HOUR STORM **x, 2.00" T':..'' Pi<EC~F. * ~ '*';
......... -- ........ --
EHTER' A(PERV), CN(PERV} A(II4:'ERV), CN(IMPERV), TC FGF ~7.<tN NO.
AREA(ACHE::) PERVIOUS ] :~ ~,}.:RV i~.US TC{MINUTES)
A ,.,d ~, CN
1.4 1.4 86.5 .0 98.7 2.0
PEAK-Q(CF:{ ) T -~EAK(H~S) VOL (CU-FT)
.63 3.08 4136
~ ,.
E.'.{'['ER ~.'~' ][,..:.~i:h]~ilename[ .e::t ~ ' .:~ S.'?ORAGE OF COMPUTED HYDROGRAPH:
: bi0ez, hyd
¥o,.
S.C.S. TYPE-iA RAINF,':, :.
:.:;4'r:.:R: FREQ(YEAR), £.Uv.',.,'L ,2{('{OUR; , ,:~.E.':2([NCHES)
100,24,3.2
************~******** S.C.S. T'fPJ~-I& DiSTRiBUTiON
********* 100-YEA~ 24-1~']UR STO~q **~* 3.20" TOTAL PREC!P.
ENTER: A(PERV), CN(Pt'::.:';) A(]MPERV) C~flMPERV) TC FOR BASIN
b.36,81,0,5',62 .q]
DATA ':~iN'?-OUT:
AREA(ACRES) PERVIOUS IMPERTIOUS
A C N A C N
1.4 !.'4 81.0 .0 98.0
PEAK-Q (C?'S ~ 't' - ~:{A:<( HR$ ) '/:)~( CU-FT }
.22 8.00 718]
TC ~ u' :~UTES)
6.]. 9
-~:iT:.:R [c~: ][path]~[[enameC'ext] FOR STG::A(::< :;%: COMPUTED HyDP. CGRAPH:
/b' bi ~30ex.hyd
SPECIal: C - CONTINUE, N ~r.~S~O~4, ? PR~.:T, ~ - =mOP
L
S.C.S. ~PE-1A RATNFALL D!ST~%BUTION
2,24,1.5 ..............
********************** S.C.S. Ty:):.:.X.A DiSTRiBUTiON
.... -- ....... -- ....
........... CN 75{PERV), TC FOR
,N~_R: A(PERV), CN<PERT) A(iMPERV),
: .03,86,0.33988,11'42
DATA PR!NT~OUT:
AREA ( ACRE::' PERV ~ (~;J,~'. t' '? ~' RV i CU S
A CH A CN
~.4 ~.o s6.0 .3 98.0
pEAK-Q(CFS) T-PEAK(HR:{)
.20 7.83 3369
TC(MINUTES)
!~ .4
..-.~.,.:,;?. [,t:][path]fi. lennm,?[.ext] FOR ;FORA.;:';
~: b2de,., .hyd
J
S.C.S. TYPE-lA RAiNI.,',bL DiSTRiBU';'I,';t~
.<i~','E.L' ?R.'~Q(Y:".,'~?-), OURA'i'~ON(HG~}?.), PREC1P([N,:IiES)
10,24,2 ...............
~**~****,,~,k**~',~* S.C..5 Tyt~:.;.i.A DISTRIBUTION
****t,.*** 10-YEAR ?4--HOUR STORM **** 2.00" 'ro'rA:. PRECIP.
DATA PE!NT-OU'~:
AREA(ACRES) PER'~ ~::U:; IMPERVIOUS
A CH A CH
1.4 1.0 86,0 .3 98.0
?EAK_Q(~;FS) .? . <:\K(HRS;
.33 7.83 5294
TC(M [NUTES)
11.4
;.::~':':.:2 id ][pakh}~i~ ?aame['''x~] '":}1'" :?.'OF, AGE OF
b' bl0dev.hyd
SPECIFY: C - CON':'iNUE, N ~ NEEWSTO-~., P - PRINT,
S.C.S. T'/~,~;-1A RAiN?'A..~ DISTT. IBUTiON
=,MTER' F'~EQ(Y":AR), DURAT[':H(HCUR), PRECIP(iNCHES)
I00,24,3.2 ..............
.~*~****~ i00-YEAR 24' HOUR STORM **** 3.20" TOTAL PREC!P.
....... - .------ -- .............· ....................--------
E~i':'ER A(P~V~, CN~PERV> A(i~','EBV), CN(IMPERV) TC FOR BASIN
~.o~.~,o.3~,ga,t: .'~:
DATA F,'.., i t~':'- OUT:
AREA(ACRES)
1.4
,~ ,, .... 1 r;U c C'C ( !.; ] :lUTES )
PERV 10U.': -~
A C:l A
1.0 8(,.0 .3 98.0 ]] .4
PE3,~' .Q(.';:'5) T-PEAK(':{:'~) VOL(CU-FT)
· 69 7.83 10406
~:UTZ:! ~d: ][patr.'.fiil::name~. ,ext] FOR STO"AG]': -; ' ~:OMPUTED HYDROGRAPH':
~: ~,] OOdev. byd
..... q'~=M p - P;..NT S - STOP
S}'~':fiiFY: C - CONTINUE, N N~,~,~,~ , '
.. ?.-...:
2; .... 7.¥.-. '~
_ , · '-' ' i;,.-~.:.'-~
/ff - . ":.'.-;: ,~
.~, ~
.....
. .
,
,~-
_
.''~
_..9..:.._.
_ ..
.q
.,~
..
.,.!
i
..~
.'.~
.,
ENTER: EFFECTIVE STCEAGE OEPFH(,Ct) BEFORE OVEP. FLCW
3
ENTER [d:][~ath]filename[-extt OF FPT. M.A~Y DESIGN ~NFLCW HYOF. CGF,~F~:
A- B 1000EV. HYO
DR[MARY DESIGN i,'IFLD'N PEAK -' .~g CFS
-_-NTER P~:,,.RY DESIGN RELEASE RATE(cf.s}'
0.22
..,, ~ .....
ENi~R NL;HBER OF iNFLOW HYORCGRF, PHS TO ~; TESTED
ENTEF~ ~'~' . ..... '
~ ] [path] fl lename[ ~',t! 0c
A' ~2OEV. H'{D
ENTER TARGET RELEASE
O.O5
ENTER'
NUHSER OF ORIFICES.
SPECi~./ iTERATZCN DISPLAY' Y - YES.
SPECZ?¢' R - RE',/:EW/PEVZSE iNFUT.
,,..
iNiTiAL STORAGE ',/ALUE FOP ITERATION PURPOSES:
CvERFLOW DEPTH FOR ~R.rHARY PE,'-F, t?IFLCW :
N - ;lC
3255 CU-F?
~OTTCH ORiFiCE' ENTER
0.025
OZS.: .73 iNCHES
TGP ORiFiCE' ENTER HE2GHTCf~]
D;A.r 2,~x INCHES
PERFCRHANCE: T. NFLGW TARGET-OUTFLCW ACTU;,L-OUTFLCW
DESIGN HYO: .69 .22 .22
TEST HYD 1' .20 .01 .02
SPECIFY' O - DOCUMENT, p. - REVISE, A - ADJUST CRiF.
0
-~ERFOP'4AIICE' ZHFLGW F':~,GET-OuT FLOW ACTUAL-OUT-
GESiG;I HYO' .69 .22 .22
TEST HYD 1' .20 .0; .02.
3.00 283~
2.47 2080
E - ENLARGE, S - STOP
F~-STAGE STORAGE
· ,
3.00 2538
2,47 2080
:t ~$F.~-~CAD ~CIqD-~OTTn;4-AREA
3.00 FT ~0.1 S~-FT
R/D-~,SIgD (3.0:1 SIDE SLOPES)
TOP-AREAl il 'F.B. )
2081,9 SQ-FT
STCR-CEPTH
3.00 FT
~CUEL: ORiFiCE RESTR!CTOR:
BOTTOM ORiFiCE:
TCP CRIFiCE:
DiA(!NCHES; HT(FEET) Q-MA;q(CFS)
.73 .00 .025
3,14 2.47 ,195
STAGE(iT)
.00
.30
!.20
1.50
2.10
2.40
2,47
3.S0
3.50
OISCHARGE(CFS)
.00
.0~
.01
.01
.02
.02
.02
O2
,0~
22
t 1S
2 68
"9T
· -',~_--'.=AOE ',iE.:..TiC~L PERHEA, a,:L!TY:
.0 .0
144.0 .0
3:' 0 .0
5~i,g .0
739.6 ,0
ggg.~ ,O
1292.3 .0
1521.2 .0
1987.7 .0
2078.9 .0
2303.~ .O
2841.3 .0
3000.1 .0
3~63,7 .0
3232,3 .0
3506.0 .0
358z.7 .C
?EC~F'{' F - FILE,
· 0 Hi,lUTES/iNCH
:.~.ER id o[Datt~]r~iename[.e;~] FOR STORAGE OF F, CUTZNO DATA
,:.,- 8; 00. OET
~=-,- FIr, F, = - REV;SE
SDECZF'¢' F - FILE, ,,9 - NEWJCB. p - ~.,.',;~ i . ., '
3TCPA.SE-VCLUl~,E
2~q~
S -
ENTER' TAN~i O!,tWETE.R (fi), E.:~ECTIVE STCRAGE OEPTH (fi)
ENTER [d:](path]filename[.ext] OF P.RiMARY 0ESiON !NFLCW HY~PCG~PH:
~' B i OODEV. HYD
~Ri~A~Y DESIGN !NFLCW PEAK : .69 CFS
ENTER PRiHARY DESIGN RELEASE RAFE(cFs)'
0.22
ENTER NUH~ER OF iNFLOW HvS~CG~4P;.S TO BE TESTED FOE
2ZSER G',iERFL'$W OEPTH FCR PRiM,tR'f O~AK ...... :
E~ECZ."-¢ [TE.=.ATZCN OZSPLAY: v - YES. re - NO
FCP, ,$,(Cc Z~IFLCW TARGET-C, UT FLG".
5ES:GN ~(YD' .65 .22
-_'-ST H'/O" .20 .0:
ACTUAL-GUTFLCW 2K-STAGE STCRAGE
¢~ 3.99
.O2 2.66
_ ~,4~j=n= ~ - 27.5:
~ :OjUST ORZF. E - "'- ......
~CTU4L_CIjTFLCW PK-STAGE STCRAGE
.02 2.66 199¢
r,~;IK--L ENGTH STCPAGE-VOLUNE
225.4 FT 2329 CU-FT
STRUCTURE OATA' R/O T~N~ (¢LAT
::SER-HE.~O TANK-OIAH STOR-0EPTH
4.00 .-"T 4.00 FT 4,00
DIA(I~ICHES) HT(FEET)
.14 .00
2.47
:OuSLE ORZFiCE RESTRICTCR'
BOTTOM ORZFICE'
TOP ORIFICE'
:CUT l N...q OATA'
STAGE(F-F) D~SCMARGE(CFS) STCRAGE(CU-FT)
.0C .0O .0 .0
.43 .0~ 147.4 .0
.~0 '0~ 403.3 .O
1.20 .02 714.7 .u
1.60 .02 I058.;
2.00 .02 14~5 3 .0
2.40 .02 1774.5 .3
2.58 .02 20;7.4 .0
2.80 .08 2117.9 .0
2.20 .15 2429,3 ,0
2.60 .19 2685.2 .0
o~ 2832.6
4.00 ''~ 2332 5 .C
z. IC .54 ·
4.20 l.l~ 2332.5
· .30 ~
~.40 2.54 2832.6 '
a.50 2.92 2832.6 .0
,~',IER,,.tGE 'IEFTZCAL 'RE.=,.'4EAS''-LT--Tv' , H;,,~.-'"~/~.,('-.m
_ 2 - ccT.,'tT ,ZF/CF.
,~ :,,~: ;'.,': F ~T.L~, :'t ,qEWJO~2 '"
ENTE~ Cd:i[cath]f~;ieneme['ex%] FOR STORAGE CF RCUTiNG
;2EC.'?!' F - FZLE, ,N - ~tEWJCG, ' P - P:,ZNT iF/OF.
t
I
S - STCF
S - STCm
I. Erosion and Sediment Control
I. Stabilization and Sediment Trapping
2. Delineate Clearing and Easement Limits
3. Protection of Adjacent Properties
4. Timing and Stabilization of Sedimentation measures
5. Cut and Fill Slopes
6. Controlling Off-site Erosion
7. Stabilization of'remporao' Conveyance Channds and .Outie:s
8. Storm Drain Ir.let Protection
9. Underground Utility Construction
lO. Cer,,.st,mction Access Routes
Ii. Removal of Temporary BMPs
12. De.waterin*- Construction Sites
" "-.':--'e,'~ on Consm,':tion Si;cs
la. Control of Pollutants Other than .~e,.u,,.,
14. .Maintenance:
!.5. Financial Liabilir.,-
II.
Preservation of Nar~ral Drainage Systems
Maintain natural drainage patterns to maximum extent practicab!e.
Discharges from site should occur at natural location to maximum
practicable
III.
Source Control of Pollution
AFpiy approved source control BMPs to maximum ex;em ?rac:icabte.
Basin Plan (see Large Parcel Minimum Requirement ~9) may be used
-' source control BMI:;5 tailored t;~,r a specific basin.
!V
Runoff Treatment BMPs
Provide treat[,'nent of stOnitv, ater.
Size trcament BMPs for water quality design storm 16-momh.
period).
Use infiltration to fullest extent practicable.
Use treatment BMPs as described in an approval manual. B.",'tPs
within natural v,-~etated buffer, except for necessary con',eyance
appro;'ed.
Basin Plan (see l.argc Parcel Minimum Requirement #9) may be used
stormwatc~' treatment requirements tailed for a specific bas.i.n
V.
Streambank Erosion Comrol
t. Limit peak rate of runoff from. developed s,e to 50 percent of existing cc,:.,dition
2.year. 24-hour design storm.
2. Maintain existing condition oeak runoff rates from developed sit for tl':e I0-. ar~
lO0-year, 24-hour design storms.
3. Use infiltration to fullest exter~t practicable. Stormwatcr must be treated before
direct discharge into groundwater.
4.. Use streambank erosion control BMPs as described in an approved manual.
BMPs shall not be built ~vithin natural ve,..,atcd buffers, except for ,,-,. ...... :
conveyance systems as approved.
5. Basin Plan ( see Large Parcel Minimum Requirement ,"'9) may be used to de','e!op
stre?.mbap& erosion control requirements tailored for a sFecific basin.
Wetlands
l. Control and treat stormwatcr discharges to wetlands to me,:: State V,,'atcr Quality
Standards and Ground Water Quality Standards.
2. Discharge to wedand only after evaluation alternative discharge
Discharges shall maintain hydroperiod and flows of existing conditions to extent
necessaE/ to protect characteristic uses.
3. Const.-ucted wetlands used for treatment must be constr'uc:cd in non-wetland .~rea
and mana,2ed for storm, water treatment. D~scharges are regulated.
No storrnwater dischanze to create wetlands used for miti,2ation.
..,,. ~ VC ...~ ,.:-1 t.. ~
5. Storrnwater treatment BMPs shall not be built within naturai -._o .... ' buffer.
except for necessao' conveyance systems as approved.
6. Basin Plan (see Lar=e Parcel .'..!inimum Reqmrement ~9) ma'..' ~¢ used ~o de,.'elcp
wetlands r,.quircme~ts taiiored for a spe:ific basin.
vii. Water
Quality Sensitive Areas
i. More stringent controls may be required by the lo:al gove,-'ranent for protection
or' water quality sensitive areas.
. but,ers.
'~ Stormwater treatment BMPs shall not be built ,.vithin natural ,,'c_t: .... cd '""
-' except for necessary conveyance systems as approved.
3. Basin Plan/see Large Parcel Minimum Requirement #% ma.',' be used to dc,.'elop
water quality sensiti','e areas requirements tailored for a specific basin.
VIII. Off-site A~:al.vsis and Nlitigatio,
I. Conduct analysis of off-site water quality impacts resulting from thc project and
mitigate th:sc impacts. Analysis shall extend a minimum of one.fourth
' :'~,~-'~%~,'<'. ....... · , ' ~ ' ,- · ~ ' "";'. ':" .'7'~-.~i~'~ ?~:.'?-~/;%~.~' '
'- ~'~'4 ~ ~.~5~ '. (..~ ~' .-~,' .... "". ' · ~~~' , ..... ' ".
~..,, ,, ~. ~;'-~., ~,_~ - _- . ............ .
'-,'.~%' ,~4~'~, ;
.'"':'": ] dowmtream from project.
'~- J 2. E.~in~ or potential ~mpacts tnclu~c, · .
-,: .... ] ..... :;""~_~L_~ J.' ...........
. .~:':;j' ~- qualltv standards, sp~lls and d~scharge~
quality standards
...':-7'.
':~-"'- .... "' IX. Basin Plamng
' :'---~52'
· ., .j ..... ,' .:
' -'~e I
X,
Xt.
Minimum Requirements #3-7 may be modified by adopted and implemented basin
plar~, provided the level of protection for ,zurflce or grou,.'Kl wa:er achieved
equal or exceed that produced by implementation of the Minimum Recuirement~,
Basin plar~ shall Ix developed in accordance with an approved manual, and may
include retrofitting of BMPs for watershed wide pollutant reduction,
Operation and Maintenance
1. l(~ent~y responsible party, and provide sch=duie of o[',-,:ration :,.nd maint~mn,--.-
activities for ail proposed ston'.qwater facilities and B*IPs.
Financial LiabiliLv
i. Performance bonding or other appropriate financial ins~
compliance ,x'i[h ~.hese standards.
_.
-.'i
-.~
-:
'1 '::l
'.'I
0 ~ . ¢r1~, l,.j ~ x x
' :-':?';~'{;":':'.- ' I // // ~"~ ~ ~'-- ~' ~ '",
.' ~ / / ~z~ o f ~-- ~ m ~
~ O-- o~ ' ~ '~ // ' · / ~ "
"X '- ...... / ' ~o~ / /
. "~ / ~ - . ,
~ ~- -- - - "~' POPE REsoURCES
~ I~7;.EIL,sh,~.I',I~EtEI,,,~,,.,~, ]L~.c. INDIVIDUAL LOT
............ ~ET.NT,-N _ON_ D
~ ~A~ WAT NE BAIN~RI~8 I~HD, WA ~llO
?HONE: (206) 142.S514
~,-., ~c~l~- ~m~c~ ~s/-f~-~'a-~
I;
Civil Engin~r~ o ~nd Su~eyor~ ~' Planner~
~) WYA~ WAY HE BAIHBRJ~B ISlaND, WA ~110
PHONE: (206) 14Z'3514
; ~~ '-'
~: ,,t~~ "--4
5i')U ,.~... Z()3'
~ENT
POPE RESOURCES
--. -.- .
.... ~nod~UaL LOt
DETENTION POND DETAIL
........