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1 1 1 1 1 1 beneficiaries, including contractors, whose rights are junior to August 1, 1935) and located upstream of GMR, and (e) contents of GMR, exclusive of non-project and junior "refill" right water held in the reservoir, upon the initiation by Reclamation of storage (between April 1 and May 15 of each year). The Colorado River Water Division No. 5 "fill" is achieved when the sum equals 154,645 acre-feet." Blue River Decree Fill. "The sum of the (a) water actually stored in GMR since the initiation of storage (between April 1 and May 15 of each year), (b) releases of all inflow since the initiation of storage (between April 1 and May 15 of each year) greater than 60 cfs (amount that satisfies operating criteria provisions including downstream rights on the Blue River senior to August 1, 1935), (c) depletions caused by Senate Doc. No. 80 beneficiaries, including contractors, whose rights are junior to August 1, 1935 and located upstream of GMR, and (d) contents of GMR, exclusive of non- project water held in the reservoir, upon the initiation by Reclamation of Storage (between April 1 and May 15 of each year) pursuant to the Blue River Decree. The Blue River Decree "fill" is achieved when the sum equals 154,645 acre-feet" The 20,000 acre-feet release to the 15-1\ile Reach would count against the first fill right of a reservoir because under Water Division 5 policy, the allowable fill under a first fill right cannot exceed the difference between a reservoir's Start of Fill Date storage and the maximum decreed storage amount under the first fill right (personal communication with Alan Martellaro, July 2001). StateMod and the C1 Data Set count the 20,000 acre-feet release against the reservoir's first fill right. This policy does not apply to a refill right where water can be diverted under a reservoir's refill priority up to the decreed amount of the refill right. StateMod and the C1 Data-Set correctlyhandle this situation. Power generation effected by the direct flow power right is not debited against the "paper fill" of ' Green Mountain Reservoir by the Division 5 Engineer. StateMod and the C1 Data Set are currently not modeling this situation accordingly; StateMod and the C1 Data Set are debiting such power releases made under the direct flow power right against Green Mountain Reservoir's first fill right. 1 1 1 t Power releases made under the direct flow power right are debited in the accounting against the "Blue River Fill" specified in the Blue River Decrees which define the obligations of Denver Water and Colorado Springs in relationship to Green Mountain Reservoir. Based on the results of the analysis using the C1 Data Set (Fourth Revision) and prior revisions, however, StateMod and the C1 Data Set were not correctly modeling the exchanges and substitutions among Williams Fork Reservoir, Wolford Mountain Reservoir and Dillon Reservoir. Consequently, it was uncertain whether the fill obligations of Dillon Reservoir in relationship to Green Mountain Reservoir under the Blue River Decree were being handled correctly in StateMod and the C1 data sets. The Revised StateMod and C1 Data Set (Fifth Revision) attempted to correct this problem. 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. 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. P:\Data\GEN\CWCB\19665\Report Phase 2\FinalReport9.03\Final_CFOPS_Report(9-03).doc 28