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FLOOD09845
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Last modified
1/26/2010 10:10:48 AM
Creation date
10/5/2006 4:41:17 AM
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Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Basin
Statewide
Title
Floodplain Management Workshop
Date
2/10/1993
Prepared For
Greeley
Prepared By
CWCB
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />~TEP 10 <br /> <br />HYDRAULIC ANALYSIS <br /> <br />Use the results of the Hydrologic Analysis and lhe Field-SUlveyed Cross-Section to determine <br />the Flood Elevation <br /> <br />Estimate flood velocity using Table 'Dlf Estjimatt~d Flow Velocities <br /> <br />1) Consider channel shape <br /> <br />2) Consider composition of channel bottom <br /> <br />3) Consider channel slope <br /> <br />Choose the appropriate methodology for hydraulic analysis <br /> <br />Method 1 <br /> <br />For sites with slow water velocities (less than 5 feet per second) and <br />no significant backl/vater effects use the Continuity Equation: <br /> <br />Q=AV <br /> <br />Method 2 <br /> <br />For sites with higher velocities and no significant backwater effects <br />use any computer program that calculates Manllings Equation <br /> <br />(~) (1.) <br />Q_ 1.49 A D 3 I' 2 <br />I --.(1.n. .,) <br />n <br /> <br />Method 3 <br /> <br />If the backwater effect of constrictions such as bridges or culverts <br />and/or the effect of friction are important considerations, then a Step <br />Backwatl:r Program such as, HEC-2 should be used, The <br />proponent should retain a professional engineer to perform such an <br />analysis. <br />
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