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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />on the sti 11 i ng bas i n was repa i red wi th shot-crete to correct the <br />freeze-thaw induced damage. The cost of repairs on Santa Maria and <br />Continental dams since 1980 has been over $330,000. <br /> <br />Santa Maria Dam has a history of seepage and leaking but only when <br />the reservoir was relatively full. Some of the seepage occurs through <br />a 1 arge 1 ands1 ide or debri s sl ide at the southern corner of the <br />reservoir, but this has always seeped. This seepage is the source of <br />water for Ghost Lake and Seepage Creek in the valley south of the dam. <br />The debris sl ide has been studied extensively and presents no danger <br />for reservoir integrity or additional movement. <br /> <br />However, because the dam does experience increasing seepage as the <br />reservoir fills, a storage volume limit of 32,000 acre-feet (gage <br />height of 73 feet) has been established, limiting the water surface to <br />27 feet below the crest of the dam. This represents a reduction of <br />11,825 acre-feet (27 percent) of the decreed storage right of 43,825 <br />acre-feet. The dam experiences seepage of about 1.5 cubic feet per <br />second (cfs), as measured by a Parshall flume, when the reservoir is <br />at gage height 73 feet. <br /> <br />C. C1 imate Summary <br /> <br />1. Servi ce Area <br /> <br />The water stored in the reservoir is used for irrigating crops in <br /> <br />the western portion of the San Luis Valley, mainiy in Rio Grande and <br /> <br />_ !t <br />