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<br />Ou1081.1 <br /> <br />to tile irriGated crops, it would be necessar:r to d,ivert an average of <br /> <br />3.19 acre-feet per acre at the headgate to compensate for the losses <br /> <br />bet>leen the headgate and the farm. Canal los~es average 32 percent of <br /> <br />the headgate delivery. Lateral and farm losses amO'lnt to 5 percent and <br /> <br />25 percent, respectively, of the remaining supply in the canal and <br /> <br />lateral. The usable retm'n flows amount to over 40 p<,rcent of the head- <br /> <br />gate diversion. <br /> <br />The estimated totALideal headgate diversion re'luirements, the <br /> <br />historical headgate diversions to the lands adjusted to simulate Twin <br /> <br />Lakes diversions prior to 1936 when the diversion system '.as completed, <br /> <br />the effective headgate requirements, and the irrigation shortagec are <br /> <br />shown in table 2 for the period 1911-1944. Ditches having senior water <br /> <br />rights often divert more >later than ie needed for a full >later supply, <br /> <br />and di~llhes having junior water rights do not receivc the required <br /> <br />quantities of water. Therefore, the historical headgate diversions have <br /> <br />been adjusted to sho>l the past effective headgate diversions. The past <br /> <br />ehortages have been obtained by subtracting the effective headgate <br /> <br />divernions from the ideal headgate requirements. <br /> <br />.t_.;\~,';"'" <br /> <br />, <br />1.l..,.'.I. <br /> <br />, (i' " <br />I if''- <br /> <br />" <br /> <br />Potential SUDuly <br /> <br />I [l~' <br />, i)' <br />tv'- <br /> <br />, , <br />\ ''l.r'' ....., <br /> <br />The po ten tial ~later supply woul d be <br />, <br />! <br />square miles of Fr:,-ingpan River I drain!l.f;e <br /> <br />derived from e porticn <br /> <br />1"1- <br />of :1"7- <br /> <br />area above e18vation 10,000 <br /> <br />feet west of the Continental Divide in Pitkin County, Colorado. Based <br />SIr1f,V'1(,,1 <br />upon hydrologic studies, an average of.-6€',,{10V acre-feet each year could <br /> <br />have been diverted from the Fryingpan River to the East.ern Slope during <br /> <br /> <br />the 34-year period 1911-1944. The total runoff originating in the <br /> <br />29 <br />