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•' COLORADO WATER SUPPLY CONDITIONS UPDATE FROM THE OFFICE OF THE STATE ENGINEER; DIVISION OF WATER RESOURCES July, 1993 ROOM 818,1313 SHERMAN ST.,DENVER,CO 80203; (303)-866-3581 Cool weather in May and June has allowed the snowpack to melt in a manner which prevented the flooding feared earlier in the spring. It has allowed the runoff to extend later into the summer which should be of benefit to irrigators. Statewide reservoir storage was 118% of normal on June 30, with the Rio Grande basin having the highest storage rate at 190% of normal. The National Weather Service 30 day forecast (July 1) is for below normal temperatures and above normal precipitation statewide. Their 90 day forecast (July 1) is also for below normal temperature and above normal precipitation over the entire state. The Surface Water Supply Index (SWSI) developed by this office and the U.S.D.A. Soil Conservation Service is used as an indicator of water supply conditions in the major river basins of the state. It is based on stream flow, reservoir storage, and precipitation for the summer period (May through October). During the summer period stream flow is the primary component in all basins except the South Platte basin where reservoir storage is given the most weight. The following SWSI values were computed for each of the seven basins on July 1, 1993 and reflect conditions during the month of June. July 1, 1993 Change From Change From Basin SWSI Value Previous Month Previous Year South Platte +2.4 +1.2 +0.6 Arkansas +2.3 -0.6 +2.2 Rio Grande +1.3 -0.1 +2.9 • Gunnison +2.5 -1.0 +3.9 Colorado +1.9 -0.8 +4.1 Yampa/White +2.2 +0.5 +5.7 San Juan/Dolores +2.1 -1.4 +2.7 SCALE -4 -3 -2 -1 0 +1 +2 +3 +4 Severe Moderate Near Normal Above Normal Abundant Drought Drought Supply Supply Supply 1