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Last modified
1/25/2010 7:10:20 PM
Creation date
10/5/2006 2:35:53 AM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Basin
Statewide
Title
The NWS Simplified Dam Break-Flood Forecasting Model
Date
5/16/1986
Prepared By
FEMA
Floodplain - Doc Type
Historic FEMA Regulatory Floodplain Information
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<br />EXAMPLE MAXIMUM BREACH OUTFLOW DISCHARGE AND DEPTH CALCULATION <br /> <br />The following data on the reservoir and breach are gathered: <br /> <br />Reservoir surface area at max pool level, <br /> <br /> <br />Height of max pool level above final breach elevation <br /> <br /> <br />Average final breach width (estimated), <br /> <br />Time to maximum breach size (time of failure), <br /> <br /> <br />Additional outflow at time tf' <br /> <br />As' = 350 acres <br />H = 50 ft <br />, <br />Br' 100 ft <br />tf> 45 minutes <br />Qo' = 5000 cfs <br /> <br />These values are substituted into Eqs. (1) and (2) to determine the maximum <br />breach outflow. i.e. <br /> <br />C <br /> <br />23.4 (350) <br />100 <br /> <br />= 81.9 <br /> <br />Qbmax <br /> <br />= 3.1(100) (i?. <br />60 <br /> <br />81.9 <br />+ 81.9 <br />/5'0 <br /> <br />) <5000 - <br /> <br />95800cfs <br /> <br />From a topographic map the following cross-sectional data is obtained: <br /> <br /> Table 1 -- X-SECTION DATA FOR EXAMPLE PROBLEM <br />Mile 0.0 Mile 12.3 Mile 40.5 <br />Elev Topwidth Elev Topwidth Elev Topwidth <br />5532 0 5483 0 5370 0 <br />. <br />5540. 480 5490 400 5380 590 <br />5550 900 5500 770 5390 930 <br />5560 1300 5510 1330 5400 1440 <br />5570 1350 5520 1400 5410 1460 <br /> <br />1-9 <br />
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