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<br />. <br /> <br />Reservoirs control significant amounts of return flow and tribu- <br />tary inflw below Grey Mountain Reservoir. It may be desirable <br />to transfer parts of decrees for these reservoirs in order to <br />lower losses. <br /> <br />studies based on the estiraated plains reservoir operations <br />of the group of 28 reservoirs indicate 52,000 acre-feet capacity <br />is needed in the plains area to control the tributary inflow below <br />Grey Mountain. This capacity along with the 20 ,000 acre-feet of <br />desired minimum storage in the plains reservoirs was considered as <br />the amount of plains storage capacity that shouJ.d not be transferred. <br /> <br />The estimated maximum aggregate content in the reservoirs <br />during the study period was 135,000 acre-feet, or some 12,000 acre- <br />feet less than the 147,000 acre-feet decreed capacity. This <br />difference is believed to be indicative of storage right capacity <br />which is now unavailable due to fledimentation or deterioration of <br />facilities. It was assumed that 10,000 acre-feet of this presently <br />unusable capacity wouJ.d be replaced along with the plains reservoir <br />consolidation. The total storage to be consolidated in the unit <br />reservoirs is assumed to be 73,000 acre-feet as indicated belOlf: <br /> <br />. <br /> <br />Estimated maximum content during study period <br />(present usable capaCity) ----------------------135,000 AF <br />Unusable capacity which wouJ.d be replaced ------__ 10,0~ <br />Total usable capacity with the Cache la <br />Poudre Unit for existing storage decrees--------145,000 AF <br /> <br />Capacity remaining in plains reservoirs ---------- 72,000 AF <br />Consolidated storage in unit reservoirs ---------- 73,000 AF <br /> <br />The total water developed by the consolidation, capacity replace- <br />ment, and transfer of plains storage rights wouJ.d be 13,000 acre-feet, <br />the sum of the following three components: <br /> <br />l--Reduced losses while fining. A canal loss estimated at <br />20 percent of the river diversion would be saved by storing <br />'fater in the unit reservoirs which are located on the river. <br />This saving was determined lJ,S the difference between the <br />historic cane.110ss of 15,300 acre-feet per year (Col 2, Table 6) <br />and the anticipated canal loss with the cor,lbined operation of <br />the storage rights with the Poudre Unit of 9,200 acre-feet per <br />year (Col 7, Table 6) --------------------------------- 6,100 AF/Yr <br /> <br />. <br /> <br />2--Increa.sed diversion to storage under the plains storage <br />ri&hts. An increased diversion to storage under the existing <br />decrees will be possible ~lith the anticipated operation of <br />the Cache la Poudre Unit due to the addition of 10,000 acre- <br />feet . r-e placement capacity to the present usable capacity and <br /> <br />29 <br /> <br />