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Reevaluate the firm annual yield of Pat Mayse Reservoir in order to determine <br />feasibility of increasing authorized diversions. Some of the existing information may <br />need to be reconciled. Examples include: <br />a. Certificate of Adjudication 02 -4940 authorizes the impoundment of <br />124,500 acre -ft and diversions totaling 61,610acre -ft (55.Omgd). <br />b. The City's Corps of Engineers contract identifies the conservation pool <br />as the space between 415msl and 451ms1 and states that this is <br />estimated to provide 109,600acre -ft of storage after 100 years of <br />sedimentation. See Exhibit A to contract. <br />c. Region D Plan (Table 1.10) identifies the conservation pool as <br />124,500acre -ft and authorized diversions as 59,750acre -ft. <br />2. Review the Corps of Engineers' calculations used to establish sediment pool, <br />conservation pool, and flood pool in an effort to determine whether a more <br />favorable allocation for the conservation pool is possible. <br />3. Evaluate feasibility and cost - benefits of raising the height of the dam at Pat Mayse <br />Reservoir. The costs /benefits analysis should include evaluation of potential liability <br />due to changes in the release of flood flows. , <br />4. Evaluate potential system operation of Lake Pay Mayse and Lake Crook to improve <br />combined yield of both projects. <br />5. Evaluate potential reuse of return flows. Options include: <br />a. Combine City's wastewater return flows with raw water that could be <br />sold to the City of Irving. <br />b. Evaluate potential uses for return flows of raw water sold to Lamar <br />Power. Options include downstream sale of discharge through bed and <br />banks permit or redirecting return flows to Lake Crook or Pat <br />Mayse watershed. <br />You should also ask the engineers to identify other potential evaluations that could be <br />conducted. <br />6 -5 -2008 <br />