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. WATER RIGHTS The Cache la Poudre River, like most streams of the eastern slopes of Colorado, has been over appropriated, i,e" rights to divert water for direct use and for storage usually exceed the divertible flow, Water would be available for storage in the Idylwilde Reservoir only during periods of very high flow when all rights are satisfied or during the non-irrigation season when storage demands can be met by stream flow accretions below the Idylwilde Dam site, The project would be operated in conformity with Colorado law, POTENTIAL YIELD OF M&I WATER RIGHTS . The city of Greeley has direct flow rights totaling 12,5 c,f,s, and the City of Fort Collins has rights totaling 19.93 c,f,s" but 4,93 c,f.s. of the latter rights are limited to use during the period April 15 through October 15. The two cities also own rights which permit the importation of water into the basin and rights to obtain water from the Colorado-Big Thompson Project. Historic diversions made through exercising the rights of the M&I interests are not a measurement of the potential yield of these rights because the demand for water has at times been less than the quantity which could have been diverted, The results of studies for estimating the yields obtainable from these rights are presented in table 5, Table 5,--Average annual potential yields from existing M&I water rights (acre-feet) Fort Collins Greeley Item Developed rights Direct flow / C-BT Shares !:': Pleasant Valley Ditch Arthur Ditch North Poudre Irrigation Districts Bob Creek and Columbine Ditch Mountain Reservoirs Subtotal 11,300 8,200 600 2,000 1,300 8,900 10,500 23,400 300 3,900 23,600 Undeveloped rights Transmountain diversions Mountain reservoirs Total 23,400 500 6,300 30,400 !:':I Each share of C-BT rights was judged to yield 0,8 acre-feet of water, . 17