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, I ~I . . ~ I' '.. 11.":\ '<,I ,. . n-......cl u:.k':>,J Description of Existing Model 5 July August September OClob(r November Dcc~mber 106.200 95,600 80,300 75,000 75.000 72,000 70,000 69,000 68,000 (,0,000 64.000 106,200 January February March April May June Gunnison Tunnel divt=rsions are as contemplated wilh AB Lateral hydropower developmem In place; total tunnel diversions under the baseline scenario are shown in Table R. 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 return flows. The assumed capacHies ofthe various Project facilities 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 I31ue 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 allo\\"3.ble Tunnel diversions downward where necessary; in the baseline scenario this adjustment W'..LS imposed in 1954 and 1977. Bostwick Park Project Silver Jack reservoir, on the Cimarron River, is the principal feature of the Bostwick Park Pro. jecr. Silver Jack is operated with 12,820 af of active storage on a fill and spill b:lSis except for the months of July through October, when operations are based on declining smrage targets The storage targeLS are used to draw storage down prior to sening outlet valves at their wimer release levels; operational Ole. cess to Silver Jack is severely limited in. the winter. The targets used in the model are as follows: N ov.J une July August 12.800 1\.300 7,30U September October 4,800 3.500 Diversions of direct flow and storage water are rOUled through the Cimarron Canal (up m 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. DaI1as Creek Project Ridgway Reservoir is the principal feature of the Dallas Creek Project. In Ihe model, Ridgway is operated on a forecast basis in January through July and on a declining storage target basis in the remaining months. If these releases are not enough, additional releases are made to irrigation use on an as.needed basis and to M&l use follOwing a demand pauern derived from lhe Dallas Creek Dennite Plan Report. The Ridgway M&I 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 mflow (whichever is less) is imposed throughout the )'l'ar, The objective of the forcc:.lSL-bascd rdl'a.sc is La make adequate space in the reservOir to store the upcommg runoff and fill the n:'scrvoir \-\'llhoUl spilling by the end or July. The release is calculated using the following equatiun: