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COLORADO <br /> WATER SUPPLY CONDITIONS UPDATE <br /> FROM THE OFFICE OF THE STATE ENGINEER; COLORADO DIVISION OF WATER RESOURCES September, 1998 <br /> LOOM 818,1313 SHERMAN ST.,DENVER,CO 80203; (303)-866-3581 <br /> Stream flows and SWSI values were higher for the northern portion of the state during August. Reports from those <br /> areas of the state also indicated that irrigation water supplies were generally adequate. Reports from the southwestern areas, <br /> especially the Durango region, indicate drier weather. Statewide, reservoir storage was at approximately 120% of normal <br /> as of the end of August. <br /> The Surface Water Supply Index (SWSI) developed by this office and the U.S.D.A. Natural Resources Conservation <br /> Service is used as an indicator of mountain based water supply conditions in the major river basins of the state. It is based <br /> on stream flow, reservoir storage, and precipitation for the summer period (May through October). During the summer <br /> period stream flow is the primary component in all basins except the South Platte basin where reservoir storage is given the <br /> most weight. The following SWSI values were computed for each of the seven major basins for September 1, 1998 and <br /> reflect conditions during the month of August. <br /> September 1, 1998 Change From Change From <br /> Basin SWSI Value _ Previous Month Previous Year <br /> South Platte 3.4 +0.4 -0.6 <br /> Arkansas 1.3 +0.2 -1.6 <br /> Rio Grande -0.1 +0.2 -2.7 <br /> Gunnison -1.4 -1.9 -4.3 <br /> Colorado 3.2 +2.3 -0.1 <br /> Yampa/White 2.7 +0.3 -1.1 <br /> San Juan/Dolores 0.1 -1.0 -3.6 <br /> SCALE <br /> -4 -3 -2 -1 0 +1 +2 +3 +4 <br /> Severe Moderate Near Normal Above Normal Abundant <br /> Drought Drought Supply Supply Supply <br /> 1 • <br />