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<br /> <br />. <br /> <br />PART III--HYDROLOGY <br /> <br />General <br /> <br />The reconnaissance hydrology studies indicate that the <br />proposed plan wouJ.d develop a new water supply for both irri- <br />gation and municipal and industrial use. The new irrigation <br />supply, as measured at the farm headgate, 'WouJ.d average 15,200 <br />acre-feet annually, of which only 12,000 acre-feet was considered <br />salable for reasons to be discussed later. The ne1f irrigation <br />supply 'WouJ.d be assigned to individual farms and ditches which . if <br />experience a shorter water supply than the area. average. The wl",~ d.....4 ,v <br />nffif water supply available for municipal and industrial use ~., ;-"-'/ . ' ' /, <br />Ej.vera.ges 16.0200 acre-feet annually. The combined peaking capacity -7"",,/ P 'J, <br />of the two powerplants wouJ.d be 274,000 1!Jil and the average energy <br />production wouJ.d be 186, 500,000 KWH annually. <br /> <br />. <br /> <br />The Cache la Poudre River, the largest tributary of the <br />South Platte River, drains an area of approximately 1,900 square <br />miles in the States of Colorado and Wyoming. The in-basin water <br />supply is augmented by a number of transbasin diversions, <br />including the Colorado-Big Thompson Project. <br /> <br />Ap~oximately 242,000 acres of land are irrigated in the <br />basin. Y They are served by about 30 major canal and reservoir <br />systerls which are privately mmed and operated. <br /> <br />Wi thin the Cache la Poudre drainage basin are 75 or more <br />privately owned reservoirs. With respect to storage capacity <br />they range in size from a fffif acre-feet to nearly 20,000. Their <br />aggregate storage rights total more than 200,000 acre-feet. <br />About one-third of the reservoirs are located in the mountains <br />and about two-thirds in the plains, the latter being the irrigated <br />portion of the basin. The principal existing irrigation features <br />including U.S.B.R. installations of the Colorado-Big Thompson <br />Project are shown in Exhibit 2. <br /> <br />The cities of Fort Collins, Greeley, and several smaller <br />municipalities obtain their water supply from the surface waters <br />of the Cache la Poudre River. Most of these municipal supplies <br />have been acquired through purchase of irrigation water rights and <br />facilities. <br /> <br />Of the total water allotments of the Colorado-Big Thompson <br />Project, about one-half are held by water users within the <br /> <br />Y South Platte Basin Report, USBR, Region 7, 1959 <br /> <br />. <br /> <br />II <br />