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FLOOD03984
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Last modified
1/29/2010 10:15:22 AM
Creation date
10/5/2006 12:15:42 AM
Metadata
Fields
Template:
Floodplain Documents
County
Douglas
Teller
Arapahoe
Community
Douglas, Teller, Arapahoe Counties
Stream Name
South Platte River
Basin
South Platte
Title
Hydrology Report for Flood Insurance Studies
Date
1/2/1975
Prepared For
FEMA
Prepared By
J.F. Sato & Associates
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />schematic representations are shown :.n l'i,\'\Ire 1. Both 2L,..hr and <br />6-hr rainfall depths were applied using Type II and Type IIA <br />distributions. <br /> <br />The 24-hr Type IIA storm produced discharges higher than other <br />distributions and more closely in agre0n~nl wit', the COE study as <br />follows: <br /> <br />Study <br />COE:, 1976 - Ref. 1 <br /> <br />Fountain Creek at the County Line, Dra:inage Arr"Cl = 11.5 sq. mi.'" <br />Peak Discharges (cfs) <br />1 O:.Y..!:..m 50-=.vr__l.QQ_.::.YE____~.!:~0.:.Y~___. <br />3,000 5,800 7,500 14,000 <br /> <br />This study, JFSA <br /> <br />2,550 <br /> <br />5,670 <br /> <br />7,560 <br /> <br />12,350 <br /> <br />* Drainage Area below El. 9000 ft. is 7.8 square miles. <br /> <br />The 50-yr and 100-yr peak discharge estimates in both studies <br />agree within two (2) and one (1) percent, respectively. The <br />10-yr peak flow estimate in this study is about 15 percent lower <br />than in the previous COE: study, and the 500-yr estimate is about <br />13 percent lower. <br /> <br />We have adopted the COE peak discharges for the hydraulic <br />analysis of Fountain Creek since the 50-yr and 100-yr events <br />match closely the present: TR-20 analy,<;is. From the results of <br />the TR-20 program included as Appendix A and COE estimates <br />mentioned above, the following flows were obtained: <br /> <br />-8.. <br />
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