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<br />'. <br /> <br />Part 4 - Reservoir Data (Contd) <br /> <br />. <br /> <br />Assuming that major floods oocur in the future of magnitude <br />and frequency equivalent to the 190B-1942 period, the effective capacity <br />of the conservation pool will decrease about one-half in 34 years, and its <br />useful life will terminate in about 68 years, unless in the meantime other <br />reservoire are oonstructed upstrewn from Caddoa and are operated for flood <br />eontrol and silt detention purposes. <br />Table 17 assumes that all sediment coming into the reservoir will <br />deposit and aooumulate therein. This assumption is not strictly true <br />beoause of the following conditions. <br />a. At times when water passes through an empty reservoir <br />the silt carried in suspension will be ccnveyed through <br />rather than deposited in the reservoir. Such flow of water <br />also tende to soour out and carry with it some of the <br /> <br /> <br />sediment previously deposited. <br /> <br /> <br />b. At times when silt laden water enters the reservoir pool <br /> <br /> <br />while water is also being released, some of the entering <br /> <br /> <br />silt will be carried through the reservoir without <br /> <br /> <br />deposition therein. <br /> <br /> <br />The above faotors (a and b) will tend to reduce slightly the <br /> <br /> <br />sedimentation rate and correspondingly inorease the effective storage <br /> <br /> <br />capacities shown in Table 17. Quantitative values for these factors are <br /> <br /> <br />difficult of determination and, in any event would be quite small compared <br /> <br /> <br />to the total volumee involved. It is thsrefor proper and oonservative to <br /> <br /> <br />utilize the values shown in Table 17 without refinement for the effeots <br /> <br /> <br />disoussed above. <br /> <br />... <br /> <br />,. <br /> <br />'. <br /> <br />..27.. <br />