24-Deliberate on the Lake Pat Mayse Water Study Committee recommendations

Home Browse Search

HDR-00085438-001 Executive Summa reservoir sediment coilditions. The finn yield of a reservoir is defined as the amount of water which can be annually diverted from a reservoir, without shortage, during a repeat of the historical drought of record. The TWDB recently completed volumetric surveys on both reservoirs and this data was used to estimate 2060 reservoir capacities. The 2060 tirm yields of Pat Mayse and Lake Crook using the modified Red River WAM, updated hydrologic data for the 1950 through 2007 period, and projected 2060 reservoir capacities. The results of the finn yield analyses for Pat Mayse and Lake Crook are shown in Table ES-4. The total combined finn yield of the two reservoirs is 66,960 acft/yr (59.7 MGD) assuming independent operation of the two reservoirs. Tab/e ES-4. Summary of 2060 Water Supply Estimates 2060 Firm Yield acfbyr Reservoir MGD Pat Mayse Lake 59,670 53.2 Lake Crook 7,290 (6.5 Combined 2060 Supply 66,960 59.7 ES.4 Alternative Water Supplies As part of the Pat Mayse Lake study, the Conunittee and the City included in the scope of work the investigation of the following alternatives: • Reuse of return flows, • Diversion of unappropriated flow from Pine Creek and spills from Pat Mayse, • Reallocation of flood storage, • Combined reservoir system operations, and • Over/underdrafting concepts. All alternatives were investigated to detennine the quantity of additional water supply potentially available. Some of the options were combined to determine if paired concepts could produce more water than stand-alone concepts. Plamiing level cost estimates were developed for several of the options for use by the Conunittee. Table ES-5 summarizes the potential 2060 firm Ciry of Paris - Pat Muyse Lake Study ES-7 fal Ja~ruury 2009 - Draft T Pn0,27;s