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r 14 <br /> 1 COLORADO <br /> WATER SUPPLY CONDITIONS UPDATE <br /> 4 <br /> FROM THE OFFICE OF THE STATE ENGINEER; DIVISION OF WATER RESOURCES October, 1993 <br /> ROOM 818,1313 SHERMAN ST.,DENVER,CO 80203; (303)-866-3581 <br /> Statewide reservoir storage was 106% of normal at the end of September, with the Rio Grande basin having the highest <br /> storage rate at 215% of normal. <br /> The National Weather Service reports statewide September precipitation as 93% of normal. The weather service's 30 day <br /> outlook(October 1) is for near normal temperatures and above normal precipitation statewide. Their 90 day outlook(October 1) is <br /> for well below normal temperatures and slightly above normal precipitation statewide. <br /> The Surface Water Supply Index (SWSI) developed by this office and the U.S.D.A. Soil Conservation Service is used as <br /> an indicator of water supply conditions in the major river basins of the state. It is based on stream flow, reservoir storage, and <br /> precipitation for the summer period (May through October). During the summer period stream flow is the primary component in <br /> all basins except the South Platte basin where reservoir storage is given the most weight. The following SWSI values were computed <br /> for each of the seven basins on October 1, 1993 and reflect conditions during the month of September. <br /> October 1, 1993 Change From Change From <br /> Basin SWSI Value Previous Month Previous Year <br /> South Platte +3.3 +0.5 +1.4 <br /> Arkansas +2.2 -0.7 +1.1 <br /> Rio Grande +2.3 -0.6 +1.3 <br /> Gunnison +1.0 -2.2 +2.8 <br /> Colorado +2.0 -1.8 +2.8 <br /> Yampa/White +0.6 -0.8 +1.4 <br /> IISan Juan/Dolores +1.9 -0.6 0.0 <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 /> 1 <br />