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COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <br />FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES August 2008 <br />ROOM 818, 1313 SHERMAN ST., DENVER, CO 80203 <br />303-866-3581; www.water.state.co.us <br />The Surface Water Supply Index (SWSI) developed by this office and the U.S.D.A. Natural Resources <br />Conservation Service is used as an indicator of mountain-based water supply conditions in the major river basins of the <br />state. It is based on stream flow, reservoir storage, and precipitation for the summer period (May through October). <br />During the summer period, stream flow is the primary component in all basins except the South Platte basin where <br />reservoir storage is given the most weight. <br />The statewide SWSI values for the month range from a high value of 2.8 in the Gunnison Basin to a low value of <br />0.8 in the South Platte Basin. Two of the basins (Gunnison, Colorado) experienced a gain from the previous month's <br />values. Four of the basins (South Platte, Arkansas, Rio Grande, YampalWhite) experienced a loss from the previous <br />month's values. One of the basins (San JuanlDolores) remained unchanged from the previous month's values. <br />The following SWSI values were computed for each of the seven major basins for August 1, 2008, and reflect the <br />conditions during the month of July 2008. <br /> August 1, 2008 Change From Change From <br />Basin SWSI Value Previous Month Previous Year <br />South Platte +0.8 - 0.1 - 0.5 <br />Arkansas +1.4 - 0.4 +0.8 <br />Rio Grande +1.0 - 0.6 +0.5 <br />Gunnison +2.8 +1.0 +3.3 <br />Colorado +2.5 +0.5 +3.5 <br />YampalWhite +1.8 - 0.3 +5.5 <br />San Juan/Dolores +1.6 0.0 +2.0 <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 />