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Bear Creek Desi~n Capacity Storage Capacity at Spillway Crest (El. 5667) - 55,300 AC.Ft 28, 600_.~c, Ft Reservoir Design (Rainfa~l SPF) (El. 5635.5) Conservation Storage - 100-year Sediment (El 5558) 2,OO~ Ac'Ft Available for flood storage 53,300 Ac Ft Flood storage required under reevaluation is 38,000 Ac Ft (routing of 500-year 60-day volume) - which leaves 15,300 Ac Ft vacant for water supply storage. "" Bear Creek Capacity Update (Mar 1983) Storage capacity ~t Spillway Crest (El 5667) 58,400 Ac ,Ft Conservation Storage - 100-year Sediment (El 5558) 2,000 Ac Fe" Available for Flood Storage 56,400 Ac Ft 56,400 - 38,000 leaves 18,400 for water suppry. 4. Historical Impacts. Although it has been demonstrated through the desi~n calculations that water supply storage is available in Chatfield and Bear Creek, the true measure of the impacts of these changes can only be demonstrated by a. simulated operation of the Tri Lakes system. This' was one of many reasons for, developing the Denver Area Real Time System. The major components of this model are shown on inclosure 2. With the Reservoir Simulation portion of this model', many different combinations of storage, releases and downstream channel constraints were analyzed. These data were displayed in charts and tables that have been previously' distributed. Additional displays have been developed showing the impacts on peak annual pool levels for the simulated period of 1942-1984. These are shown on inclosure~ 5. Impacts on Dam Safety. Chatfield - The maximum surcharge for this project was based on routing the probable maximum flood through the reservoir with a starting pool elevation of 5473. This start- ing elevation corresponds to the storage requirement for a SOO-year spring inflow routing on top of a 20,000 acre-foot conservation pool. The resulting freeboard was 6.4 feet. 2