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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 />Examination of the X-sectional data indicates that, because the topwidths <br />increase very slowly above a depth of approximately 30 ft, a reasonable value <br />for h is 30. <br />v - <br /> <br />The distance weighted average cross-section data is used in Eqs. (5a)-(6c) <br /> <br /> <br />to determine the K and m parameters of the equation B _ Khm. <br /> <br /> - <br /> Table 7 -- VALUES USED IN LEAST SQUARES COMPUTATION OF K and m PARAMETERS <br />i hi log hi (log hi)2 Bi log Bi (log hi)(logBi) <br />1 8 0.90 0.82 455.7 2.66 2.39 <br />2 18 1.26 1.58 849.8 2.93 3.67 <br />3 28 1.45 2.09 1331 3.12 4.51 <br /> h <br /> v <br />4 30 1.48 2.18 1383 3.14 4.64 <br /> 5.08 6.67 11.85 15.23 <br /> <br />15.23 _ (5.08)4{11.85) <br />m = L - 0.84 <br />6.67 - (5408) <br /> <br />Log K = 11484 - 0.84 (5.~8) <br /> <br />= 1. 89 <br /> <br />- <br />K = 10 log K _ 78.2 <br /> <br />. <br /> <br />With these distance weighted average K and m parameters, the new peak <br /> <br /> <br />depth at the dam is found to be 26.53 feet. This value is used in Eqs. <br /> <br /> <br />(19)-(27) to compute the following routing parameters. <br /> <br />1-33 <br />
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