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<br />. <br /> <br />Greeley and Fort Collins have two ways of meeting the resultant <br />increased needs for M&I water from future growth in population, One <br />way is to increase, as needed, the utilization of their existing water <br />rights until these rights are ultimately fully exercised, The second <br />method is through their annexation policies which, in brief, are as <br />follows: the city of Greeley requires that water rights of 0,8 ac,-ft, <br />per acre and Fort Collins 2 aC,-ft. per acre be assigned to each city <br />respectively for each acre of land annexed. The results of studies <br />for estimating future M&I supplies, requirements, and shortages are <br />summarized in tables 8 and 9, <br /> <br />WATER UTILIZATION <br /> <br />. <br /> <br />An operation study was initiated for the potential Idylwilde <br />Reservoir, This study, insofar as it was completed, was to <br />feasibility standards, and was made on the assumption that the <br />project water would be used for meeting future M&I needs, Included <br />in the operations, were the effects of transferring the rights of <br />some existing mountain reservoirs into Idylwilde and also the <br />effects of transferring on a "space available" basis, the rights <br />of some existing plains reservoirs, Transfer of the mountain <br />reservoirs was proposed to reduce OM&R expenses, and the transfer <br />of the plains reservoir rights was proposed to reduce losses from <br />evaporation and seepage. Work on the operation study was terminated <br />when it was revealed that projected M&I supplies from existing and <br />potential nonfederal sources appeared to be adequate to meet the <br />estimated future needs until 2010 for Fort Collins and 2025 for <br />Greeley, <br /> <br />A mass curve analysis was made to demonstrate that the entire <br />167,000 acre-feet of storage capability of the Idylwilde site would <br />be required to regulate the total available surplus flow, The inter- <br />relationship of capacity, yield, and cost was shown to be such that <br />the lowest cost per acre-foot of yield could be obtained by constructing <br />a reservoir which utilized the full capacity potential of the site. <br /> <br />River outlet works with 2,000 c,f,s, capacity would be required for <br />meeting maximum requirements to satisfy downstream water rights and an <br />assumed municipal demand on storage. <br /> <br />From these incomplete studies, the regulation of storable surplus <br />flow by, the potential Idylwilde Reservoir would yield approximately <br />20,000 acre-feet of project water annually, <br /> <br />The operation studies indicated also that flows normally stored <br />in some plains reservoirs could be temporarily regulated in Idylwilde, <br />and that storage from several municipal-owned reservoirs located in <br />the mountains could be permanently transferred. Furthermore, the <br /> <br />. <br /> <br />21 <br /> <br />