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I I I I I I I I I I I I I I I I I I I I - ~ {"\ "'31; / t... -..i ". Scenario D is to assess the delivery system requirements based on the initial results of the W.W. Wheeler & Associates repore on the Lake Meredith Enlargement Feasibility Study, The study's results indicated a proposed Lake Meredith high dam alternative with a high water surface elevation of 4,260-ft. msl. with a useable storage capacity of 80,823 AF. Based on this storage and the storage of Lake Henry, this scenario assesses the amount of Colorado Canal diversions that will effectively use this storage capacity on an annual basis, The Colorado Canal headgate annual average diverted flow to effectively utilize the proposed storage is approximately 405 cfs with an assumed Lake Meredith annual average release flow of one half the diverted flow or 178 cfs. The four water delivery scenarios are summarized in Table I-A with three primary results/conclusions identified below, Based on these results, it is apparent that the Lake Meredith storage capability will be based on physical constraints, and therefore can not effectively use all of the Colorado Canal delivery system capacity, This result is based on an assumption that Lake Meredith average annual releases are approximately one-half of the storage inflows, This assumption needs further analysis and verification during refmement of the Lake Meredith Reservoir enlargement and operation plan, . Based on a previous Lake Meredith Enlargement Study, a combined storage total of Lake Henry and Lake Meredith of approximately 89,000 AF would require a total annual average Colorado Canal diversion of approximately 390 cfs which would effectively utilize little more than half of the canal's capacity (760 cfs). · The topographic contours of the area may economically limit the potential storage capacity of Lake Meredith, URS Greiner - 3 -