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COLORADO <br /> WATER SUPPLY CONDITIONS UPDATE <br /> FROM THE OFFICE OF THE STATE ENGINEER; COLORADO DIVISION OF WATER RESOURCES August, 1998 <br /> ROOM 818,1313 SHERMAN ST.,DENVER,CO 80203; (303)-866-3581 <br /> The SWSI values indicate normal to above normal water supply conditions in the state. Dry conditions in May and <br /> June over most all except the northwest corner of the state have been followed by a very wet July over the entire state. In <br /> addition to providing direct moisture to crops the rains have boosted stream flows. Reservoir storage generally remains good, <br /> being at approximately 115% of average statewide. <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 August 1, 1998 and reflect <br /> conditions during the month of July. <br /> August 1, 1998 Change From Change From <br /> Basin SWSI Value Previous Month Previous Year <br /> South Platte 3.0 +0.5 +0.5 <br /> Arkansas 1.1 +1.0 -0.9 <br /> Rio Grande -0.3 +0.7 -2.6 <br /> Gunnison 0.5 +1.5 -1.8 <br /> Colorado 0.9 +2.5 -0.7 <br /> Yampa/White 2.4 +1.4 +0.3 <br /> San Juan/Dolores 1.1 +1.8 -1.5 <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 />