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I I I I I I I I I I I I I I I I I I the future demands projected in the CBT/Yindy Gap Environmental Impact Statement. In addition to the 471,285 AF of active storage available on the Yest Slope, the combined capacities of Carter Lake and Horsetooth Reservoir, 237,750 AF, were' included in the Phase II model to provide East Slope storage for CBT and Yindy Gap. Yater stored on the Yest Slope was delivered to East Slope storage through the Adams Tunnel, subject to its total capacity of 550 cfs. The monthly operations of both projects were revised in the computer models to reflect current NCYCD policies. Limitations on winter CBT usage and limitations on carry-over of unused CBT and Yindy Gap quotas have been incorporated. The capacity of Adams Tunnel is reduced by 50 percent during June of each year to account for annual maintenance on the tunnel. The concept of a "unified" system has been incorporated into the models. Yest and East Slope CBT facilities are used for storage and conveyance of Yindy Gap water. In the model simulations, Yindy Gap water was given preference over CBT in conveying water to East Slope demand and/or storage through the Adams Tunnel, provided that this preference does not result in spillage of CBT water or reduced deliveries to CBT users. Under the unified system of operation, it is not necessary to physically transfer Yindy Gap water to the East Slope; it could be delivered prior to transfer if water was available in Carter or Horsetooth Reservoirs. 3.4 DESIGN CONDITION DEFICIT The revised computer models were utilized to simulate the monthly operations of the City's water supply sources under the Design Conditions. The simulation resulted in an estimated deficit of 2,745 AF at the 100-year recurrence interval. This compares to the deficit of 4,851 AF estimated in the Phase I study. In contrast, a deficit of some magnitude occurred once every 3.2 years under the operational constraints simulated in Phase II, 3-13 I