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<br /> <br />COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <br /> <br /> <br /> September 200 8 <br />FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES <br />ROOM 818, 1313 SHERMAN ST., DENVER, CO 80203 <br />303 - 866 - 3581; www.water.state.co.us <br /> <br /> <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 /> <br /> The statewide SWSI values for the month range from a high value of 3.1 in the South Platte Basin to a low value <br />of 0.0 in the Rio Grande and San Juan/Dolores Basin s . The South Platte Basin experienced a gain from the previous <br />month’s values. Th e remaining six basins (Arkansas, Rio Grande, Gunnison, Colora do , Yampa/White, and San <br />Juan/Dolores ) experienced a loss fro m the previous month’s values. <br /> <br />The following SWSI values were computed for each of the seven major basins for September 1, 200 8 , and reflect <br />the conditions during the month of August 200 8 . <br /> <br /> <br /> S eptember 1, 200 8 Change From Change From <br /> Basin SWSI Value Previous Month Previous Year <br /> South Platte + 3.1 + 2.3 +1.7 <br /> Arkansas + 0.4 - 1.0 +0.5 <br /> Rio Grande 0.0 - 1.0 +0. 1 <br /> Gunnison +1.6 - 1.2 +1.9 <br /> Colorado + 1.9 - 0.6 +2.9 <br /> Yampa/White +0.3 - 1.5 + 3.2 <br /> Sa n Juan/Dolores 0.0 - 1. 6 +0.3 <br /> <br /> <br />Scale <br />- 4 - 3 - 2 - 1 0 1 2 3 <br /> 4 <br />Severe Moderate Near Normal Above Normal Abundant <br />Drought Drought Supply S upply Supply <br /> <br /> <br />1 <br />