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1 ' in Dillon Reservoir and decreased storage in Williams Fork Reservoir. In order to further check the need for rerunning previous simulation runs with the modified StateMod and C1 Data Set (fifth 1 revision), simulation runs for two alternatives were made: (1) Green Mountain Reservoir making the 20,000 acre-feet release and replacing this release using its refill priority and (2) the "Share the Pain" with responsibility for making the 20,000 acre-feet release divided equally among Granby, Green ' Mountain and Williams Fork Reservoirs. Results of these additional simulation runs did not differ significantly enough to change original conclusions presented in the Technical Memoranda concerning these alternatives (see Chapter 3). However, comparing simulations by Denver Water using its daily PACSIM model with StateMod showed differences in accounting for exchanges and substitutions into and out of Dillon, Williams Fork and Wolford Mountain Reservoirs. These differences would overstate the availability of water for release from these reservoirs for meeting the 20,000 acre-foot goal (see Appendix O). Rather than continue to investigate and debate the need for further refinements to the model, it was determined that time would be better spent working on what could be done to meet the 20,000 acre-foot goal. 2.3.3 RIPRAP For purposes of determining the feasibility of each alternative for contributing toward the 20,000 acre- feet, the Final PBO specified the baseline conditions of the StateMod C1 Data Set were to include the RIPRAP projects (see Appendix D of USFWS, December 22,1999). The StateMod C1 Data Set as originally received from the State at initiation of the Phase 2 investigation did not have the following --_C0mponents-ef_IUPRAP adequately-incorporated into the-Cl-Dam Set: ----------- _-_ -_ - ¦ 5,000 acre-feet per year from Ruedi Reservoir, ¦ An additional 5,000 acre-feet in 4 out of 5 years from Ruedi Reservoir or Green Mountain Reservoir, ¦ 10,825 acre-feet per year from Ruedi Reservoir under long-term lease, ¦ 10,825 acre-feet per year on a permanent basis divided equally between east slope and west slope water users. At the present time, this requirement is being met on an interim basis by Williams Fork and Wolford Mountain Reservoirs. A permanent, long ' term solution will have to be established in the future (see section 1.3.1). This permanent solution may not involve the same components as the interim measures. ¦ Up to 6,000 acre-feet per year from Wolford Mountain Reservoir, and ¦ Up to 28,400 acre-feet per year of water resulting from construction of improved water management features for the Grand Valley Water Management Project. ' Implementation of necessary revisions to incorporate the RIPRAP projects into the C1 Data Set resulted in the C1 Data Set Fourth Revision (see Table 2). 2.3.4 CROPS CROPS is a voluntary program, the participation in which is determined on a yearly basis. Individual participation in CROPS is dependent on conditions that are present each year, including snowpack, 1 forecasted streamflows, and reservoir storage levels, among others. CFOPS is perceived to be a firmer 1 PAData\GEN\CWCB\19665\Report Phase 2\FinalReport9.03\Final_CFOPS_Report(9-03).doc 22