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HomeMy WebLinkAboutBLD2006-00361 -Hydrogeologic • • • HYDRAULIC MODELING AND ANALYSIS U.S. Highway 101 Milepost 174 Hoh River Erosion Project — Engineered Logjam Bank Protection Prepared for Washington State Department of Transportation Environmental Services Office Transportation Building P.O. Box 47331 310 Maple Park Avenue SE Olympia, Washington 98504 Prepared by Herrera Environmental Consultants, Inc. 2200 Sixth Avenue, Suite 1100 Seattle, Washington 98121 Telephone: 206/441-9080 and northwest hydraulic consultants 16300 Christensen Road, Suite 350 Seattle, Washington 98188 I July 20, 2004 "•1104. ....4 ••• elf:* . 1 - • \:•,..,: • w ••,,,•• A i t.• , •••'' ‘•••••,'" :• .• " ''' ...Irrr.-a"• • •••••••"..-' • iliFf..• ;I•L4ini 44•NI 7.1:9'.' "'4-li'Ike',..-',• Z.,Lk 4.'4. gj ..... it.,tINS • ./. '4,,r, tr•V 4,)?'IV,'dtllg,..tfilk4,I.nit: 1'6 . tr*-*'."!'"itl'. PI" :14 ^.'41 •p4;qtp •••=/14)*•'''•-t•vIt'ef-11.. 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' 'r . -''''•`..• •• ..4.0..v.4 ••......-''':.7• .1'.',..1,' ' 4••'•••'..1. . . • • '' .,•* • , fi ' S _ n 794000 796000 798000 800000 2.1. Hoh River Project Site, U.S. 101 MP 174.4 including survey points used to create mesh, HEC-RAS cross-sectio and water surface elevation gauge locations. Surveys conducted by WSDOT in spring 2004. Flow is from easi 0 0 Hydraulic Modeling and Analysis-U.S. Highway 101 Milepost 174 Table 3.1. HEC-RAS water surface elevations at cross sections 20 and 110. Water Surface Elevation Recurrence Interval -Cross Section 20 Cross Section 110 151.12 170.99 100-year170.48 50-year 150.67 25-year 150.15 169.89 149.28 168.95 10-year166.20 2-year 146.63 1-year 141.44 160.98 The HEC-RAS model was also used to assess potential flood backwater conditions supstream of chan e in water the mid-channel ELJ structures. Table 3.2 includes the estimated upstream of the ELJ structures g in various flood elevation at several cross-section locations events. Figure 2.1 shows the cross section locations. Table 3.2. Backwater effects upstream of mid-channel ELJs predicted by HEC-HAS• Location Estimated Backwater Rise(ft) ' Distance from ELJ Station (ft) 1-Year Flood 2-Year Flood 100-Year Flood 0 0 ' 100 3,160 0 0 98 2,925 0.01 0 0 0 96 2,690 0.01 0 94 2,456 0.03 0 0 0 93 2,338 0.03 0 0 92 2,220 0.04 0 0 91 2,103 0.060 90 1,986 , 0.08 0.01 0.11 0.01 0 87.5 1,728 0 85 1,470 0.16 0.03 0.22 0.07 0 82.5 1,211 0.12 80 953 0.29 0.15 0.33 0.22 0.21 76.66 841 0.44 73.33 728 0.39 0.40 70 615 0.52 0.56 0.59 68 492 0.66 0.76 0.87 66 369 0.85 1.00 1.05 64 246 1.06 1.28 1.21 62 123 1.26 1.41 1.23 60 0 1.09 1.13 1.00 ' Note: The store at the Hoh River Resort is approximately 3,000 ft from the upstream edge of the proposed mid-channel ELJs(near cross section 98). IFirst two ELJs assumed to be located on either side of cross section 60. I `4/0-12217-013h '°dieNode'''.•ood°""'"`"doe Herrera Environmental Consultants 1.,1„ 9n 7no4 43