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<br /> <br />Total <br /> <br />525,000 13.1' <br />20,000 af <br /> <br />18,000 af <br /> <br />47 ,00013.1' <br /> <br />610,000 13.1' <br /> <br /> <br />. <br /> <br />Future (without Poudre Unit)--(l) The 610,000 acre-feet <br />depletion was again assumed representative of a year of adequate <br />water supply. (2) Average unavoidable future basin outfiow was <br />estimated to be 80,000 acre-feet, considering effects of Colorado- <br />Big Thompson future return fiws and increased Greeley return fiOlfS. <br />Thus 690,000 acre-feet annual supply wouJ.d be required under future <br />conditions. (80,000 + 610,000 = 690,000) <br /> <br />It is evident that the above evaluations are simplified. They <br />are intended to ShOll only the years and the relative magnitude of <br />the irrigation shortages occurring in the basin. However, a rough <br />check on the depletion figure can be obtained: <br /> <br />Consumptive use Area <br /> <br />Irrigated lands (242,000 acres 2.17 at/a) <br />MuniCipalities (10,000 acres, 2 af/a) <br />Plains reservoir losses -(10,000 acres, <br />1.8 af/a) <br />Depletion not accounted for (seepage areas, <br />water plants, etc.) <br /> <br />Est. Annual C, U. <br /> <br />. <br /> <br />It is anticipated the limited amount of irrigation supply <br />developed by the project will be delivered to individual farms and <br />ditches experiencing 'frequent shortages. Detailed studies of farm <br />shortages will be required during feasibility investigation to <br />determine the delivery pattern of the new supply. <br /> <br />Hydrologic Studies for the Plan of Development <br /> <br />The plan of development for the unit encompasses additional <br />storage and regulation of the available water supply in three broad <br />categories: (a) storage of the unappropriated surplus f'lows; (b) <br />provide storage in Tinmath and Fossil Creek Reservoirs to make <br />maximum use of the return f'lws occurring below Grey Mountain <br />Reservoir; (c) savings realized by the plains reservoir consolidation, <br />capacity replacement, and transfer. <br /> <br />Utilization of' Surplus Flows <br /> <br />The hydrology studies assUll1e that with construction of the <br />Cache la Poudre Unit, a water storage right wouJ.d be filed to <br />enable all unappropriated surplus f'lows to be stored in the unit <br /> <br />. <br /> <br />24 <br />