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<br />physical features Df the watershed can prDduce the rapid CDncen- <br /> <br /> <br />tratiDn Df runDff that characterizes flash flDDds Df high peak <br /> <br /> <br />flDws, small vDlumes, and shDrt duratiDns. <br /> <br />* <br /> <br />-, <br /> <br />* <br /> <br />VELOCITIES OF WATER during the Standard Project FloDd would <br /> <br /> <br />range up tD abDut 26 feet per secDnd (18 miles per hDur) in the <br /> <br />main channel Df the creek. VelDci ties outside Df the main channel <br /> <br /> <br />vary widely, depending upDn IDcatiDn, but wDuld reech abDut 9 feet <br /> <br />per secDnd (8 miles per hDur) in SDme areas. TheSE' high velocities <br /> <br /> <br />during a majDr flDDd would be extremely dangerDus tD life and <br /> <br /> <br />property. VelDcities greater than 3 feet per secDnd cDmbined with <br /> <br />depths Df 3 feet Dr mDre are generally cDnsidered hazardous eVEm <br /> <br /> <br />tD adults. <br /> <br />* <br /> <br />* <br /> <br />-, <br /> <br />DURATION OF FLOODS on FDuntain Creek is relatively shDrt as <br /> <br /> <br />cDmpared tD thDse Dn the Arkansas River at PueblD. FDr the Inter- <br /> <br /> <br />mediate RegiDnal FIDDd, duratiDn abDve bankfull stage wDuld be <br /> <br />, <br />abDut 9 and 10 hDurs, respectiv_ly, in the upper and IDwer reaches <br /> <br /> <br />Df FDuntain Creek. During the Intermediate RegiDnal FIDDd, the <br /> <br /> <br />creek wDuld rise Dver 9 feet in 5 hours with a maximum rate of rise <br /> <br /> <br />of about 2.4 feet per hour in the upper reach. Similarly, the rise <br /> <br /> <br />wDuld be mDre than 10 feet in 5.3 hours with a maximum Df abDut <br /> <br /> <br />2.4 feet per hDur in the IDwer lOeach. The duratiDn Df the Standard <br /> <br /> <br />PrDject FIDDd wDuld be abDut 19 and 20 hDurs, respectively, in the <br /> <br /> <br />upper and IDwer reaches Df FDuntain Creek. During the Standard <br /> <br /> <br />PrDject FIDDd, the stream wDuld rise Dver 17 feet in 8 hDurs with <br /> <br /> <br />a maximum rate Df rise Df about 2.9 feet per hDur in the upper <br /> <br /> <br />reach. The rise wDuld be abDut 18 feet in 8.7 hDurs in the IDwer <br /> <br /> <br />reach with a maximum rate Df abDut 2.9 feet per hDur. <br /> <br />* <br /> <br />* <br /> <br />* <br /> <br />FLOOD DAMAGE PREVENTION MEASURES by IDcal interests cDnsist Df <br /> <br /> <br />imprDvements in the FDuntain Crsek channel whereby it can now <br /> <br />carry apprDximately the 1965 flDDd Df 47,000 cubic feet per secDnd <br /> <br /> <br />frDm the 8th Strset Bridge tD belDw the 4th Street Bridge. <br /> <br />3 <br />