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<br />A Sevier Case... <br /> <br />The Sevier River Basin in southern Utah is another example where it is <br />especially important to consider regulation. Two diagrams with 1961-90 <br />runoff averages for the April-July period are shown, the one on the left for <br />observed (regulated) volumes and the one on the right for natural <br />(unimpaired) volumes. <br /> <br />OBSERVED or REGULATED <br /> <br />NA TURAL or UNIMPAIRED <br /> <br />nr Gunnison <br />(93) <br /> <br />nr Gunnison <br />(239) <br /> <br /> <br /> <br />nr Sigurd <br />(161) <br /> <br /> <br />nr Sigurd <br />(32) <br /> <br />Vermillion Dam <br />(18) <br /> <br />Vermillion Dam <br />(148) <br /> <br />Piute Res nr Marysvale <br />(85) <br /> <br />Piute Res nr Marysvale <br />(1l5) <br /> <br />nr Kingston <br />(30) <br /> <br />nr Kingston <br />11", (32) <br />"8( " <br /><'ork <br />Sev <br />1er <br /> <br />nr Kingston <br />(83) <br /> <br />nr Kingston <br />11<i,y (30) <br />(Pork <br />Sel" <br />1er <br /> <br /> <br />nr Circleville <br />(45) <br /> <br />nr Circleville <br />(75) <br /> <br />Hatch <br />(49) <br /> <br />Hatch <br />(54) <br /> <br />SEVIER RIVER BASIN <br /> <br />1961-90 AVERAGE April-July Runoff Volumes in 1000 acre-feet <br /> <br />8 <br /> <br />" <br />