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<br />108:; <br /> <br />I," <br /> <br />T' ~ <br /> <br />Since the completion of the original water supply studies in the <br />mid-196D's and the completion of the feasibility report and DPR in 1967 <br />and 1973, respectively, there has become available l3 additional years <br />of streamflow records as published by the Geological Survey. The total <br />period of record has been extended from l5 (1947-196l) to 28 (l947-1974) <br />years. Because of the availability of these additional streamflow <br />records, it was decided to reanalyze the project water supplies available <br />for the unit. <br /> <br />The reservoir operation study for the period, 1947-1974, results <br />in an average annual project water supply at the dam of l33,000 acre-feet <br />which includes 31,000 acre-feet from the Weldon Valley Canal direct-flow <br />right assumed to be acquired. During the 28-year study period, the project <br />water supply at the dam would have ranged from a low of 21,900 acre-feet <br />in 1955 to a high of 224,000 acre-feet in 1972. It is possible that not <br />all of the direct-flow right will be acquired for project use. Adjust- <br />ments will be made in the contracts with the districts prior to the <br />initial delivery of project water to accommodate that possibility. <br /> <br />The following tabulation compares the marketable project water supply <br />reflected in the 1973 DPR and the current plan. As shown, it is assumed <br />that ,the Weldon Valley Canal direct-flow water rights will be acquired <br />and waters resultfng" from the rights will become part of the marketable <br />supply. <br /> <br />Average annual marketable project water supply <br /> (acre-feet) Oi rect fl ow Project supply <br /> Project water <br /> yield from from Weldon Valley ava il ab 1 e <br />Study period Narrows Reservoi r Canal right at dam <br />1947-l96l 88,40D 31,000 119 ,400 <br />(1973 DPR) <br />1947-l974 102,000 31,000 l33,OOO <br />(current plan) <br /> <br />The 102,000 acre-feet of project water yield from Narrows Reservoir <br />will result in 24,500 acre-feet of divertible return flows for a new <br />water supply of 126,500 acre-feet (109,700 acre-feet in 1973 DPR). <br /> <br />The total water supply available for the project service areas, <br />including the reservoir yield, the Weldon Valley Canal direct-flow <br /> <br />3 <br />