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Last modified
1/26/2010 10:09:15 AM
Creation date
10/5/2006 4:19:31 AM
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Floodplain Documents
County
Statewide
Basin
Statewide
Title
Floodway Determination Using Computer Program HEC-2: Document Number 5
Date
5/1/1974
Prepared For
US
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Ratio of Required Conveyance Reduction (Target). <br />TARGET = (1.159.473 - 1.090.731)/1.159.473 <br />TARGET = {0.0593 <br /> <br />Ratios of Conveyance at Higher Water Surface Elevations <br />LOB RATIO = 125.442/1.159.473 = 0.1082 <br />CH RATIO = 760.559/1.159.473 = 0.6559 <br />ROB RATIO = 273.472/1.159.473 = 0.2359 <br /> <br />Determine Encroachment Stations <br />Left Station (STENCl) <br /> <br />= 0 + (.5 TARGET)/(LOB RATIO) WIDTH <br />= 0 + .5(0.0593)/(0.1082) 50 <br />= 0 + 13.66 = 13.66 <br /> <br />Right Station (STENCR) <br /> <br />= 200 - (.5 TARGET)/(ROB RATIO) WIDTH <br />= 200 - .5(.0593)/(0.2359) 100 <br />= 200 - 12.57 = 187.43 <br /> <br />The cross section data used in the above calculation was coded for <br /> <br /> <br />HEC-2. The computer solution is shown on the following page. <br /> <br />APPENDIX I <br /> <br />1-4 <br /> <br />l~ <br />
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