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,. .~" ~;k -."c~ ',-;}; .,.!: OO!2~2 Description of Existing Model 5 July August September Octob,r November December 106,200 95,600 80,300 75,000 75,000 72,000 January February March April May June 70,000 69,000 68,000 60;000 64,000 106,200 Gunnison Tunnel diversions are as contemplated with AB Lateral hydropower development in place; total tunnel diversions under the baseline scenario are shown in Table 8. The diversions in the various Project canals are constrained to be no more than canal capacities; diversions in excess of con~ sumptive use under each canal are routed as surface and subsurface retufn flows. The assumed capacities of the various Project facilit"ies represented in the model are listed in Table 9. The 1976 Taylor Park Exchange agreement permits the exchange of storage water between Taylor Park and Blue Mesa for the purpose of fishery enhancement on the Taylor and Gunnison Rivers. The Exchange account parameters are monitored in the model and used ex post to adjust allowable Tunnel diversions downward where necessaryj in the baseline scenario this adjustment was imposed in 1954 and 1977. BostWick Park Project Silver Jack reservoir, on the Cimarron River, is the principal feature of the Bostwick Park Pro- ject. Silver Jack is operdted with 12,820 af of active storage on a fill and spilI basis except for the months of July through October, when operations are based on declining storage target'. The storage targets are- used to draw storage down prior to setting outlet valves at their winter release levels; operational ac;'. cess to Silver Jack is severely limited in..the winter. The" targets used in the model are as follows: Nav-June July August 12,800 11,300 7,300 4,800 3,500 September October Diversions of direct flow and storage water are routed through the Cimarron Canal (up to a ca. pacity of 145 cfs) to satisfy municipal and agricultural demands in the Uncompahgre valley; the municipal demands are listed in Table 10 and are based on the average yield of shares held by the City of Montrose. Minimum flows of 15 cfs (winter) and 25 cfs (summer) are imposed below the Canal headgate. Dallas (;rec,k Project Ridgway Reservoir is the principal feature of the Dallas Creek Project. In the model, Ridgway is operated on a forecast basis in January through July and on a declining storage target basis in the remaining mo.nths. If these releases are not enough, additional releases are made to irrigation use on an as.needed basis and to M&1 use following a demand pattern derived from the Dallas Creek Definite Plan Report. The Ridgway M&! demand of 28,100 af is assumed to be exerted just below the reservoir outlet because the precise location of the. demand is yet unknown. A minimum release of 30 cfs or inflow (whichever is less) is imposed throughout the year. The objective of the forecast-based release is to make adequate space in the reservoir to store the upcoming runoff and fill the reservoir without spilling by the end of July. The release is calculated using the following equation: