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, , 130n.,"35 July 7, 1993 Gunnison Planning Model - Info Theme No. 12 Information Related to Blue Mesa Replacement The planning model will permit individual and aggregated demands (including potential demands) above Blue Mesa, to receive fill replacement water from Blue Mesa. To accomplish this, each upstream demand construct will include arcs through which replacement water can be diverted from the river. Replacement water is delivered from Blue Mesa by actually reducing the flow through the water rights arcs of Blue Mesa. Users will enable or disable replacement through demand-specific input and through input via the Blue Mesa dialog box. I. Specification at Demand Construct. The dialog box for each demand above Blue Mesa will include a field for the annual amount of fill replacement available to that demand. This can be a number from zero to "no limit". In the Baseline Scenario, the default value for all demands will be zero. In the Historical Scenario the default will be "no limit". 2. Specification at Blue Mesa. The Blue Mesa dialog box should have a button for Fill Replacement. The button merely specifies whether fill replacement is to operate or not; no amount can be specified since the amount available will vary from month to month depending on how much water Blue Mesa stored in the month. 3. Network Representation. At the demand construct the fill replacement pathway is a series of two arcs leading from the river node to the "from node" of the water rights arcs for the demand. The first arc in the pathway is a simple gate that is opened only in the fill replacement solution step; the second arc in the pathway is a "decree" type arc whose cumulative annual capacity is specified by the user as described above. The capacities of all such arcs will be reset to their respective annual limit amounts on Blue Mesa Reservoir's "start-fill" date. The rank on the "decree" arc is hard-wired and set to a value such that, when added to the priorities of the demand's water rights arcs, water will be reallocated away from the Blue Mesa storage right. At Blue Mesa there are no special arcs to accomodate fill replacement; in the replacement solution step the operations code simply re-opens the water rights gate for the reservoir and freezes the flows in the bypass and spillway arcs prior to calling OOK. , ~ ,c,-.J_<,...:,___,_ ! '"