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. . . .:, :![<,.. 4 ';' .)JO." , Operation study A monthly operation study or Ruedi Reservoir was made for the 19-year period August 1929 through July 1948. This period reflects a critical period of water supply and a complete cycle or operation as the reservoir would have been rull at both the beginning and the end of the period, as well as at some points in the interim. The objective or the study was to determine the manner and extent to which Ruedi Reservoir would meet tbe 2014 requirements ror municipal and industrial water expected to result from' commercial oil shale development. The operation study indicates that in critical years tbe total reservoir water yield would be needed to meet those requirements. In addition the reservoir would provide full replacement requirements as a substitute ror Aspen Reservoir ror the Fryingpan- Arkansas Project and tbe future Twin Lakes Reservoir and Canal Company diversions insofar as rights below Rued! are concerned. The operation study maintained the minimum nsh nows in the Fryingpan River or 39 c. f. s. November through April, and 110 c. f .s. May through October recommended by the Fisb and Wildlife Service. .The Fryingpan- Arkansas Project operating principles provide that these flows be maintained immediately below tbe confluence or Rocky Fo~k and the Fryingpan River a rew hundred feet below Rued! Dim; hence, the esti- mated flows of Rocky Fork during the months of May, JUne, and JUly were considered as being available to contribute to risb flow requirements. Operation study criteria provide for other allowances, including: by-pass of reservoir inflow during the irrigation season of about 8 c. f. s. for decreed irrigation rights between the Ruedi ])lm site and the mouth of tbe Fryingpan River, for decreed irrigation rigbts at cameo or 1,800 c.f.s. during the irrigation season, and for a decreed power rigbt at cameo of 800 c.r.s. during tbenonirrigation season. only consumptive use requirements or municipal and industrial water were considered because additional flows would be .available in the Colorado River for diversion requirements. The retu~n flow rrom municipal and industrial use would enter the river above the point of major existing use. In the present study river losses and control losses ror municipal and industrial' releases from Ruedi Reservoir were disregarded. More detailed studies wil1 consider these matters. 22