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I , I I I I I I I J I I I I I I I I I II to take into consideration capacity constraints of the CBT and Vindy Gap systems and to more closely simulate the operating policies of the NCVCD with respect to these projects. The revised computer models were utilized to simulate the monthly operations of the City's water supply sources under the Design Conditions. The principal modifications included: o Allowance for carry-over of CBT water in accordance with NCVCD policies. o Operation of the CBT-Vindy Gap Projects to maXImIze Vindy Gap deliveries in accordance with the recent policy statement by the NCYCD. o Consideration of capacity constraints in the conveyance facilities utilized by Loveland - i.e., Dille Tunnel and Charles Hansen Feeder Canal (CHFC). o CBT shareholders were not allowed to divert more than 50 percent of their entitlement during the winter. The net result of these modifications was that the magnitude of the water supply deficit at the lOO-year recurrence interval in Phase II (2,745 acre-feet) was less than that estimated in Phase I (4,850 acre-feet). In contrast, the Phase II results indicated that a deficit of some magnitude occurred, on average, every 3.2 years while the previous Phase I study indicated that a deficit could be expected every 6.2 years. Thus, future deficits are predicted to be less severe in magnitude but more frequent in occurrence than originally estimated in Phase I. Evaluation of Plan Elements - Twelve unique, specific actions (i.e., Plan Elements) that the City may take to reduce or eliminate projected water supply deficits were evaluated. The evaluations were performed using the computer models as modified in the Phase II study to simulate the monthly operation of the City's raw water supply system. Each Plan Element was first evaluated based on its ability to reduce or eliminate the lOO-year deficit under the Design Conditions and on its cost of implementation. The results of these evaluations are summarized in -5-