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<br />COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <br /> <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; WNW.water.state.co.us <br /> <br />May 2008 <br /> <br />The Surface Water Supply Index (SWSI) developed by this office and the U.SDA 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 snowpack, reservoir storage, and precipitation for the winter period (November through April). <br />During the winter period, snowpack is the primary component in all basins except the South Platte basin where reservoir <br />storage is given the most weight. <br /> <br />The statewide SWSI values for April range from a high value of +3.0 in the Gunnison Basin to a low value of +0.1 <br />in the Yampa/White Basin. All of the basins experienced a decline from the previous month's values. <br /> <br />The following SWSI values were computed for each of the seven major basins for May 1, 2008, and reflect the <br />conditions during the month of April. <br /> <br /> May 1 , 2008 Change From Change From <br /> Basin SWSI Value Previous Month Previous Year <br /> South Platte 0.7 -0.4 - 0.5 <br /> Arkansas 2.7 -0.4 4.3 <br /> Rio Grande 2.4 - 0.7 2.6 <br /> Gunnison 3.0 - 0.6 4.5 <br /> Colorado 2.3 -0.4 2.3 <br /> Yampa/White 0.1 - 0.1 2.9 <br /> San Juan/Dolores 1.4 - 1.6 2.4 <br /> Scale <br />-4 -3 -2 -1 0 2 3 4 <br />Severe Moderate Near Normal Above Normal Abundant <br />Drought Drought Supply Supply Supply <br /> <br />1 <br />