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<br />~ <br /> <br />~4it expenditures be made for some elements :~ ~~~ :~OOdW3!1 t~~n <br /> <br /> <br />~ny such recommendations would have ::'.J ::~ submi:.:-:?d to <br /> <br />Congress for implementation. <br /> <br />Sec. 5(b) (I). Since the flows carried by t~e Colorado <br /> <br />River below Davis Dam include both t~releases from Davis <br /> <br />Dam and any inflow from the ephemeral tributaries entering <br /> <br />the mainstream below the Dam, a floodway, to be effective, <br /> <br />must have the capacity to carry both the controlled releases <br /> <br />and such tributary inflows. In this section, the Secretary <br /> <br />is directed to complete, in consultation wit~ the seve~ Basin <br /> <br />states and other interested parties, a scudy of these <br /> <br />tributary inflows and to determine the boundaries of the <br /> <br />Colorado River Floodway to accommodate both controlled <br />~ releases and tributary inflows. <br />The standard level of protection t~at has been adopted <br /> <br />in the administration of the National Flood Insurance Act is <br /> <br />the one-in-one-hundred-year frequency flood. As mentioned <br /> <br />earlier in this statement, the Corps of Engineers had <br /> <br />determined that 40,000 cfs is the maximum release rate that <br /> <br />historically wou~d have inflicted 3 mini~um level of <br /> <br />downstream damages. Consequently, t~e boundaries of the <br /> <br />Colorado River Floodway should be capable of accommodating a <br /> <br />one-in-one-hundred-year river flow or a 40,000 cfs flow, <br /> <br />whichever is greater, from Davis Dam to the Southerly <br /> <br />International Boundary between the United States and the <br /> <br />2epublic of Mexico. <br /> <br />. <br /> <br />-14- <br />