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constraints are satisfied and mass balance is preserved. CRAM uses the Out-of-Kilter (OKA) <br />algorithm for the simultaneous solution of the mathematical equations and allocation of flows. <br />Specific Aspects of Functionality <br />Inflows . Inflows are introduced into the CRAM model directly and are allocated or routed according <br />to water right priorities and various operating rules. The inflow locations are fixed in the model, but <br />the inflow amount may vary over the simulation period. Return flows are a special type of inflow <br />which are calculated as a function of diversions according to user specified parameters. Model <br />inflows, in general, represent virgin/natural or baseline/adjusted flows. <br />Reservoir Operations . Reservoirs are characterized by CRAM according to three parameters: 1) <br />water rights; 2) physical capacities; and 3) operating rules. Water rights parameters for reservoirs <br />consist of decree amounts and priorities. CRAM charges carryover to the senior decrees first. <br />Physical capacity parameters include storage and outlet works capacities, elevation/area/capacity <br />tables, and monthly evaporation rates. CRAM computes evaporation as a function of storage <br />contents. Operating rule parameters include annual limits on the amounts of water which may be <br />released for different purposes, monthly storage targets or release amounts, and minimum pool <br />constraints. Cram is capable of handling multiple storage accounts within a reservoir. <br />Demands . Demands are generally characterized by five types of parameters: 1) water rights; 2) <br />physical diversion capacities; 3) diversion requirements; 4) supplemental water sources; and 5) <br />return flow characteristics. Return flows occur whenever a demand is less than 100 percent <br />consumptive. The location and timing of the return flow pattern may be specified for each demand. <br />The Gunnison River basin model has been set up with numerous potential reservoirs, demands, and <br />instream flow reaches which allow the user to simulate the effects of new projects. The location of <br />the potential projects cannot be moved, but the size, amount, and operating rules can be changed. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />The CRAM model is not available for use as a water rights planning model in the CRDSS project <br />because it is proprietary. It is concluded and recommended that the model be eliminated from <br />further consideration for the CRDSS project because of its proprietary status. <br />2 <br />A275 05.10.94 1.15-9 Fosha, Hyre <br />