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Last modified
1/25/2010 6:27:22 PM
Creation date
10/4/2006 11:46:57 PM
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Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Basin
Statewide
Title
Procedure for Approximate Dam Failure Floodplain Mapping
Date
1/1/1988
Prepared For
Association of State Dam Safety Officials
Prepared By
John W. Van Sciver
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />WORKSHEET W-l <br /> <br />DAM FAILURE PEAK DISCHARGE <br /> <br />DAM NAME: <br /> <br />CALCULATIONS BY: <br /> <br />LOCATION: <br /> <br />DATE: <br /> <br />PHYSICAL DATA: <br /> <br />Height, H = <br /> <br />Ft. Spillway Freeboard. FB = <br /> <br />Ft. <br /> <br />Crest Width. OW = <br /> <br />Ft. Normal capacity, V = <br /> <br />Acre Feet <br /> <br />Embankment Slopes: Upstream (Zl) = <br /> <br />:1 <br /> <br />Downstream (Z2) = <br /> <br />: 1 <br /> <br />Crest Length, LC - <br /> <br />Ft. <br /> <br />Surface Area. A = <br /> <br />Ac. <br /> <br />Kl = (.2H+IO)/OW = <br />min. 0.5~Kl~1.5 max. <br /> <br />K2=(H6.01)(LC-.54J)(A4.45)(V-5.J9) = <br />For V/H< 200 . min. 0.~K~1.5 max. <br />For 200~V/H~1000, min. 0.05~K2~1.5 max. <br />For V/H>lOOO . min. 0.00~K~1.5 max. <br />use K2 = <br /> <br />use Kl = <br /> <br />KJ =(-2-) .5= <br />Zl+Z2 <br /> <br />K4 = erosiveness of embankment materials <br /> <br />min. 0.~K3~1.5 max. <br /> <br />0.5 ~ K4 ~ 1.0 ~ K4 ~ 1.5 <br />tight stable erosive <br /> <br />use KJ = <br /> <br />use K4 = <br /> <br />ESTIMATED DAM FAILURE PEAK DISCHARGE, Qp CFS: <br /> <br />K =(~)(Kl)(K2)(K3)(K4) = <br />H <br /> <br />-0 10 <br />Tp = (J.37)(v.093)(e-1. 7KV . ) = <br /> <br />Hrs. (Min. 0.25~Tp) <br /> <br />Qp = 24.2 V = <br />Tp <br /> <br />cfs <br /> <br />A-l <br />
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