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I I I I I I I I I I I I I I I I I I I Small Reservoir Feasibility Study S-4 EVAWATION SCENARIOS The basin model was run to evaluate a number of scenarios, The first two scenarios simulated basin hydrologic conditions under current and ultimate in-basin demands, assuming no new facilities or water management measures were implemented by in-basin users but with maximum development of Denver's diversion capabillty, These baseline scenarios thus quantified the need for in-basin facillties or measures, Later scenarios incorporated selected facillties and measures to evaluate their ablllty to meet needs identified by the baseline runs, System performance under each scenario was evaluated in terms of water deliveries to in.basin users, instream flow conditions, reservoir levels, and export deliveries, Baseline Scenarios Water Deliveries Two baseline scenarios were evaluated to determine the need for new faclllties or water management measures in the basin, The first of these scenarios examined conditions under current in-basin demand levels, The second examined conditions under ultimate demand levels, Table S-4 summarizes water delivery shortages to in-basin users under these two scenarios. The apparent reasons for the shortages are given in the footnote to each user, Table 504 Annual Water Delivery Shortages to In-basin Users (values in acre-feet) Current Demands Ultimate Demands Scenario I Scenario II Water User Number Averaae Maximum Number Averaee Maximum Blue River Water District1 0 0 0 3 69 69 Breckenridge Snowmaking1 0 0 0 2 52 70 Climax Mine7 8 711 1730 8 711 1730 Copper Mtn Snowmaking1,2,5 1 30 30 31 56 219 Eagles Nest GoIP 0 0 0 31 9 9 Frisco Gou4 0 0 0 31 5 5 Keystone MuniCipal1,2 0 0 0 31 13 52 Keystone Snowmaking1,5 1 60 60 5 138 383 Mesa Cortina6 4 2 2 4 65 69 Town of Dillon8 0 0 0 2 32 47 Notes: 1. Green Mountain contents at or below minimum target, 2. Insufficient Sales Pool allocation. 3. Decree limit less than demand. 4. ewCB annual volumetric limit on diversions. 5. Diversions curtailed for instream flow maintenance. 6, Historic User Pool (HUP) releases at maximum annual limit. 7, Direct flow rights out of priority and insufficient storage. 8, Insufficient physical supply.