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32 1 Q 7 i RUEDr DAM AND RESERVOIR, COLO. Operation study A monthly opera.tion study of Ruedi Reservoir WltS Illade for the 19-year period August 1929 through July 1948. This period reflects a critical period of water supply a.nd a complete cycle of opemtion as the reservoir would have been full at both the begmnlllg and the end of t.he period, as well as at some point~ in the interim. The objective of the study was to det.."llllle the manner and ex- teilt to which Ruedi Resenoir would meet the 2014 requirements for municip,LI and industrial ,yuter expected to result from com- mercial oil sha.le del'elopment. The opemtion study indica.t..s tha.t in critica.l years the tota.l reservoir water yield woull] be needed to meet those requirenlents. Iu a.ddition the reservoir would provide full replacement require.- lnent.s as fL substitute for Aspen Resen.oir for the Fryin~al1.Arkansas project a.nd the future Twin Lakes Reservoir & C,mal Co. diversions Insofar as rights below Ruedi are concerned. The operat.ion study maintained the minimum fish flows in the Fryingpan Riyel' of 39 c.f.s. No,'ember through April, tmd 110 c.f.s. May through October recommended by the Fish and 'Vildlife Service. The Fryingpan- Arkansa.s project opemting principles provide tha.t these flows be ma.intained immediately below the confluence of RocI.;y Fork and the Fryingpall River a. few huudrefl feet helow Ruedi Dam; hence, the estima.ted flows of Roc!-'}' Fork durin(l" the months of May, June, and ,T uly were considered as being av"ilaole to contribute to fish-flow req 11 i remen ts. Operation stndy criteria pro\'ide for other allowances; including bypass of resenToir inflow during the irrigation season of a.bout 8 c.f.s. for decreed irrigation rights between the Ruedi Dam site and the mouth of the Fryingpan Ri,'Cl', for decreed irrigat.ion rights a.t Cu.meo of 1,800 C.f.5. during the irriga.tion season, and for a. decreed power right a.t C<uneo of 800 c.f.s. during t.he nonirrigation season. Only consmu{Jti,'e-use requirements of municipal and industrial wa.ter were conSidered" because additional flows would Ue l.l..\"nilable in the Colora.do River tor diversion requirements. The return flow from municipal and industrial use would enter the river aboye the point of major existing use. In the present study, riyer losses and controllosse..'3 for municipal l1nd indust.ria.l releases from Ruedi Resel'\'oir were disregarded. More deta.iled studies will consider these matt",.s. A detailed study to detCl1lline the municipal a.nd industrial supple- mental wa.ter requirements for "II yea.rs was not made. This would have required a daily operat.ion study of the entire Colorado River system above Cameo. Hmw.ver, such a detailed da.ily study wus made for the yea.rs 1934 and 1944. These daily studies were based on as- sumptions of a. 300-second-foot. mnnicipal a.nd industria] consumpt.ive- use requirement (year 2014) and that a.1I exist.inO' decrees iucluding Denver's Blue River system were in full operati~n. The st.udy also assumed that. t.he pot..nt.ia.l Parshall unit., Eagle Di,'ide unit, 'Vest Divide unit, and Silt project were in operation. The analysis s.llOwed the mllnicipal fmd industrial water require- ment from RnecII Reservoir to be 70,000 acre-feet in 1934 and 41,500 "