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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 /> The average cross section data is used in Eqs. (5a)-(6c) to determine <br /> - - <br />the average K and m coefficients for the reach. <br /> Table 5.-- VAUES USED IN LEAST SQUARES COMPUTATION OF K AND M <br />i hi log hi (log hi)2 Bi log Bi (log hi)( 10gB i) <br />1 8 0.90 0.82 458 2.66 2.40 <br />2 18 1.26 1.58 863 2.94 3.69 <br />3 28 1.45 2.09 1318.5 3.12 4.52 <br /> h <br /> v <br />4 30 1.48 2.18 1330.5 3.12 4.61 <br /> 5.08 6.67 11.84 15.22 <br /> <br />m = <br /> <br />15.22 _ (508)4(11.84) <br />(5.08)2 <br />6.67 - 4 <br /> <br />= 0.82 <br /> <br />, <br />J <br /> <br />- 11.84 (54.08\ = <br />log K = 4 - .82 I <br /> <br />1.91 <br /> <br />- <br />K =lOlog K 81.75 <br /> <br />- - <br />With these average K and m coefficients, the max depth at the dam may <br />be recomputed using Eq. (8) as follows: <br /> <br />a = ~::; (.0008)1/2 <br /> <br />( 81.75 ) <br />(0.82 + 1 )5/3 <br /> <br />27.29 <br /> <br />r <br /> <br />b = 0.82 + 5/3 = 2.49 <br /> <br />h = <br />Max <br /> <br />95800 <br />27.29 <br /> <br />0/2.49) <br /> <br />= 26.49 <br /> <br />1-25 <br />
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