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<br />. <br /> <br />e <br /> <br />. <br /> <br />..... (" . ~ <br />~JJl <br /> <br />54 <br /> <br />water storage function. It is hop8d before that time <br /> <br />that other developments above will so regulate the flm. <br /> <br />that not all of its storage capacity ~ill be naeded, but <br /> <br />it will always be desirable to conGrol the floods of the <br /> <br />region betwoan Boulder Canyon and Glen Canyon, and before <br /> <br />the capacity of the Boulder Canyon is entirely destroyed <br /> <br />the Glen Canyon regulator cml be built to take its place. <br /> <br />It 'Nill then be fresh ar.d empty of silt and will last to <br /> <br />as much later date as the age of the Boulder Cal1YOn reser- <br /> <br />voir at that time arrl will, therefore, solve the silt <br /> <br />problem for a period of two or three hundred years further <br /> <br />into the future than if it is built first, and ce,n, if <br /> <br />desired, be employed as a sluicing agency for sluici~g out <br /> <br />the Boulder Canyon reservoir. <br /> <br />If built first, the Glen Canyon reservoir would imme- <br /> <br />diately begin silting up and if sluiced in the futur3 will <br /> <br />discharg3 its sediment into the reservoir later provided <br /> <br />below and thus re~uire sl'~iciT.g of the same sediment two <br /> <br />or more times. This nr~ltiple sluicing .all not be possible <br /> <br />without shutting QO\Vn the storage ap-d other functions of all <br /> <br />the reservoirs below 1mile they are being sluiced out. <br /> <br />By the time silt deposits hav!l begun to encroach upon <br /> <br />the storage capaa.ity o:c tOle Boulder Canyon re.er'Toir suffi- <br /> <br />cient power e:~nings 7ill have accrued to amortize its cost <br /> <br />and the full ~ei~~t of th3 dam vall .till be ~vailable for <br />