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. t"SJ state line. The flows storable in the potential Granada Reservoir would. at times be limited by reservoir capacity and by the 200 secOlld-feet capacity of the diversion canal.. Diversions to the reservoir would be discontinued at such times as the river flows might be carrying heavy sediment loads. Reservoir operation A reservoir. operation study has been prepared for the 3o-year period 1921-1950, inclusive. The river flows for the years prior to the operation of' John Martin Reservoir have been modified to show the effects of the reservoir operation. For purposes of this study the Granada Reservoir was assumed to provide .....'8.ter for the following useSI 1. Evap0ration from a permanent fish pool in both John Martin and Granada Reservoir. 2. Replacement to John Martin Reservoir of depletions resulting' from additional uSe of wator above the John Martin Reservoir, specifically for tho depletions which would result from operation of the Trinidad Reservoir.Prcject to reguJate and conserve all flows of the Purgatoire River at the Trinidad ReServoir site for uso on the potential Trinidad Project, as described in the Trinidad Project Report ~ Appendix D, Irriga- tion Repert, Purgatoire (Picketvdro) River Colorado Review Report on Survey for Flood Control, June 1953, 3. Additional irrigation water Use below John Martin ReServoir in both Colorado and Kansas. It was assumed that the permanent fish pool in John Martin Reservoir would be 7,500 acre-feet and in Granada Reservoir would bo 3,000 acre- feet. These ;;J90ls would provide a minimum 8-foot dopth of water as reconunended by the Color<ldo Game and Fish Dopartment. The depletions to John Martin Reservoir resulting from the maximum operation of the Trinidad Project would be replaced by exchango from Granada Resorvoir. Additional irrigation use from Granada Reservoir was assumed to be 60 percent in Colorado and 40 percent in Kansas. Armual requirements were varied by years in accordance vdth the requirements shown in the recent John Martin Reservoir operational stud~es prepared by the Hydrc- logy Subcommittee of the Oolorado AWR Cross Coordination Group. Addi- tional use above Granada Reservoir could not physically be served directly from the reservoir but would be accomplished by exchange with the John Martin Reservoir. The following basic assumptions of hydrologic conditions were used in the reservoir operation study: -4- .