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n I'd"" ~ I .j~:){.tv't ,-, July 7, 1993 Gunnison Planning Model - Info Theme No. 11 Information Related to Blue Mesa Augmentation The planning model will permit every individual and aggregated demand, including potential demands, to receive augmentation releases from Blue Mesa. To accomplish this, each demand construct will include arcs through which augmentation water can be diverted from the river. Blue Mesa will have release arcs through which augmentation releases are made to the river. Users will enable, disable, or set annual limits upon augmentation through demand-specific input and through inputs via the Blue Mesa dialog box. 1. Specification for Specific Demands. The dialog box for each demand should include an entry field for the annual amount (af) of Blue Mesa augmentation water available to the demand. This amount will be a single non-negative number. In the Baseline Scenario, the default value for all demands will be zero. In the Historical Scenario the default value for all demands will be infinite (or some large number). Users will be able to set the amount on each demand to any non-negative value. The field in the dialog box ought to be in the same area as the field for specification of project water available to the demand. 2. Specification at Blue Mesa. The Blue Mesa dialog box (top) has a field for the annual amount of augmentation water that may be released. This is a single non-negative value expressed in acre- feet. In the Baseline Scenario its default value is zero. In the Historical Scenario its default value is infinite (or a large number). Users will be able to specify any non-negative number for this field. 3. Network Representation. The augmentation limits entered for the reservoir and for demands will be set within the model as the annual limits on "decree" type arcs. The capacities of all such arcs will be reset to their respective annual limit amounts on Blue Mesa Reservoir's "start-fill" date. Each demand will have, in series, a rankless, infinite capacity "gate" arc leading into this "decree arc". Actual flow through the augmentation release arc or the augmentation diversion arcs will be entirely demand- driven. The ranks on the augmentation diversion "decree" arcs will be hard-wired and set high enough to draw water away from the carryover arc in Blue Mesa. During the augmentation release solution step, the "gates" on the augmentation diversion and release arcs are opened and the "decree" arcs compete with the carryover arc in Blue Mesa to draw water out of the reservoir. Water rights (as well as other) "gate arcs" are frozen in the augmentation step. Augmentation will occur automaticially to upstream users (above Blue Mesa and on tributaries) to the extent that there are flows in excess of instream rights or contract- supported flows between the Blue Mesa outlet and the demand. i-..t ,4".-- j