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<br />~l <br /> <br />. <br /> <br />. <br /> <br />8xpenditures be made for some elements in t~~ :loodw~y, th~n <br /> <br /> <br />El:1Y suc~ recommendations would have ':0 C:l-e 5ubmi~~"d to <br /> <br /> <br />Congress for implementation. <br /> <br /> <br />Sec. 5(b) (1). Since the flows carried by the Colorado <br /> <br /> <br />River below Davis Dam include both t~releases from Davis <br /> <br /> <br />Dam and any inflow from the ephemeral tributaries entering <br /> <br /> <br />the mainstream below the Dam, a flood'Hay, to be effective, <br /> <br /> <br />must have the capacity to carry both the controlled rel~ases <br /> <br /> <br />and such tributary inflows. In this section, the Secretary <br /> <br /> <br />is directed to complete, in consultation with th~ seve:1 Basin <br /> <br /> <br />states and other interested parties, a study of these <br /> <br /> <br />tributary inflows and to determine the bou:1daries of the <br /> <br /> <br />Colorado River Floodway to accommodate both controlled <br /> <br /> <br />releases and tributary inflows. <br /> <br /> <br />The standard level of protection that has been adopted <br /> <br /> <br />in the administration of the National Flood Insurance Act is <br /> <br /> <br />the one-in-one-hundred-year frequency flood. As mentioned <br /> <br /> <br />earlier in this statement, the Corps of Bngineers had <br /> <br /> <br />determined that 40,000 cfs is the maximum release rate that <br /> <br /> <br />historically would have inflicted ~ minimum level of <br /> <br /> <br />downstream damages. Consequently, the bounjaries of the <br /> <br /> <br />Colorado River Floodway should be capable of accommodating a <br /> <br /> <br />one-in-one-hundred-year river flow or a 40,000 cfs flow, <br />'Hhichever is greater, from Davis Dam to the SO'Jtherly <br />International Boundary between the United 3tates anj the <br />Republic of Mexico. <br /> <br />-14- <br />