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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 SIMPLIFIED DAMBREAK DOWNSTREAM ROUTING <br /> <br />To route the flow from the dam to the cross section at mile 12.3, the <br /> <br /> <br />user must first define an average cross section for the reach and then <br /> <br />- <br />fit K and m coefficients. Reducing the data given in Table 1 produces the <br />following table. <br /> <br />. <br /> <br />Table 4.--TOPWIDTH VS. DEPTH FOR EXAMPLE PROBLEM <br />Mile 0.0 Mile 12.3 <br />Depth Topwidth Depth Topwidth* <br />0 0 0 0 <br />8 480 8 437 <br />18 900 18 826 <br />28 1300 28 1337 <br />38 1350 38 1407 <br /> <br />. <br /> <br />*Linearly interpolated to agree with depth value at mile zero. <br /> <br />To determine the average X-section, the depth vs. topwidth data is <br /> <br /> <br />substituted into the relation given in Eq. (18), i.e., <br /> <br />for hl = 8, <br />Bl 480 + 437 458.5 <br /> 2 <br />for h2 = 18; <br /> 900 + 826 863 <br />B2 = = <br /> 2 <br /> - <br />for h3 = 28, <br /> 1300 + 1337 1318.5 <br />B3 = = <br /> 2 <br /> <br />1-24 <br />
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