S. Topics for this presentation: Item 1 – Design discharges (Hydrology) Item 2 – Channel Bridge Characteristics Item 3 – Hydraulic Analysis using HEC-RAS Item 4 – National Flood Insurance Program1 of 5Hydrology HydraulicsforBridge DesignBridge Hydraulics Overview Topics for this presentation: Item 1 – Design discharges (Hydrology) Item 2 – Channel Bridge Characteristics navigate to this website 3 – Hydraulic Analysis using HEC-RAS Item 4 – National Flood Insurance Program Item 5 – Scour Analysis Channel Protection Item 6 – ODOT Submittal RequirementsItem 1: Hydrology Two primary methods used by ODOT to calculate flood discharges: • USGS report 89-4126 (rural) • USGS report 93-135 (small urban)USGS Report 89-4126: Techniques for Estimating Flood-Peak Discharges of Rural, Unregulated Streams in Ohio • Provides multiple-regression equations to calculate discharges for gaged and ungaged streams • Provides a method to adjust discharges for gaged streams • Contains data from streamflow gaging stationsUSGS Report 89-4126:Drainage AreaSupplement to the Gazetteer • Useful for calculating larger drainage areas • Available from ODNR, listed as an “out of print” publication on websiteSupplement to the GazetteerMain Channel SlopeStorageRegion for Drainage AreaDischarge Calculation for Ungaged Stream: The Region C multiple-regression equation for 100-year flood peak discharges is chosen: Q100 = (RC)(CONTDA)0. What initially appeared to be an elementary problem turns out to be quite complicated. 363 Basic characteristics for the ungaged site are determined: CONTDA = 0. edu and the wider internet faster and more securely, please take a few seconds toupgrade your browser.
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290 square miles SLOPE = 93. 290)0. 13) • Backwater should not be allowed to flood “Unreasonably large areas of usable land” • Backwater should not be increased in urban areasItem 4 – National Flood Insurance Program this • Most Ohio communities participate • Each community adopts local ordinances • Enforced by local floodplain coordinator (see ODNR website for listing)Floodways No encroachment allowed in the designated floodway unless analysis shows no increase in flood levelsNFIP Compliance • Obtain floodway map, flood insurance rate map, and flood insurance study for site. 756(93.
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usgs. gov/bridge/wsp2339. 285(STORAGE+1)-0. They assume that the bridge opening can be made so large that it will completely span the river at such a height that floodwater will never rise anywhere near the deck. pdf)U.
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09 Precipitation 31. 0+1)-0. Bridge Hydraulics Overview. army. Basic Assumptions • my link flow • Flow type constant between sections • Normal depths considered vertical depths • Level water surface across channel • Sediment and air entrainment are negligibleStandard Step MethodDefining flow data in HEC-RAS Required input for steady flow analysis: – Discharge at cross sections with a change in flow. 0)0.
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org/Who_We_Are/What_Is_A_Conservancy_District/Ohios_Conservancy_Districts. Corps of Engineers Flood Studies • U. wr. miamiconservancy. edu no longer supports Internet Explorer.
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htmItem 3 – Hydraulic Analysis HEC-RAS Software – US Army Corps of Engineers (Hydraulic Engineering Center – River Analysis System). 0 percent These values are substituted into the Region C equation: Q100 = 236(0. S Water Supply Paper 1849 (Available online, link found in HEC-RAS help menu) http://wwwrcamnl. S.
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18 (HEC-18): Evaluating Scour at Bridges Published by FHWA Best source of information on scour analysis countermeasuresTotal Scour –three components: • Long term aggradation and degradation • Contraction scour • Local scour© 2022 SlideServe | Powered By DigitalOfficeProMany people, indeed many engineers, who are not familiar with the subject think that constructing a bridge across a river is entirely a problem in structural engineering. dot. gov/sws/fieldmethods/Indirects/nvalues/index. 363 Q100 = 337 cubic read this post here per secondConfirm Suitability of Rural Equations • Check basin characteristics with ranges for region • Characteristics outside range occur infrequentlyUse of Gaging Station Data • For ungaged sites on gaged streams • Confirm that drainage basin is rural and stream is unregulated • Site can be upstream or downstream of gauging station • Results of regression equations are adjusted to agree with data from nearby gaging stationsPeakflow Software • Applies regression equations • Performs gauging station adjustments • Download from ODOT websiteUSGS Report 93-135: Estimation of Peak-Frequency Relations, Flood Hydrographs, and Volume-Duration-Frequency Relations of Ungaged Small Urban Streams in Ohio • Procedure similar to that used for rural streams • Equations are not suitable for all urban streams • Q = f (Area, Slope, BDF)Basin Development Factor (BDF): • A measure of urban development within a drainage basin 0 = No development 12 = Maximum development • Divide basin into three subdivisions • Estimate development in each subdivisionUpper 1/3 Middle 1/3 Lower 1/3 Channel Improvements 1 1 0 Channel Linings 1 1 0 Storm Drains 1 1 0 Curb Gutter Streets 1 1 0 TOTAL 4 4 0 Basin Development Factor (BDF): BDF=4+4+0=8Basin Characteristics Minimum Maximum Drainage Area 0. .