RiverS_APP_B.pdf
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- WA RRP RIDG 100(2), RIVER S BRIDGE REPLACEMENT Federal contract opportunity
- Solicitation number
- DTFH7017B00007
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Physical Data RiverS_APP_B
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APPENDIX B
Table 1: Peak Discharge Estimates
Table 2: Water Surface Elevation, Clearance, Flow Velocity
Table 1.
Peak Discharge Estimates
Peak Discharge Estimation Method
D ra in ag e A re a
(s q . m il es
) Recurrence Interval
10-year 50-year 100-year 500-year
FEMA FIS – Flood Profiles 118
8322 cfs 12,584 cfs 13,868 cfs 17,287 cfs
Flood Profiles 22 ft 26 ft 27 ft 29.5 ft
Notes:
1. Columbia River Flood Profiles, Flood Insurance Study, Clark County, Washington and Incorporated
Areas (Flood Insurance Study Number 53011CV001A).
2. Flood profile elevation datum: NAVD 88
Table 2.
Proposed Lake River Bridge
Recurrence Interval 10-year 50-year 100-year 500-year
Existing Water Surface Elevation (feet)
22 26 27 29.5
Clearance (feet)
14.4 10.4 9.4 6.9
Flow Velocity (ft/sec)
1.40 1.51 1.55 1.63
Notes:
1. Elevation datum – NAVD88
2. Clearance is distance between low chord and water surface (Bridge low chord – 36.4 feet)
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