Laserfiche WebLink
COLORADO <br /> WATER SUPPLY CONDITIONS UPDATE <br /> FROM THE OFFICE OF THE STATE ENGINEER; DIVISION OF WATER RESOURCES November, 1991 <br /> ROOM 818,13I3 SHERMAN ST..DENVER.CO 80203; (303)-866-3581 <br /> Surface water supplies declined throughout the state during October. Except for the South Platte River basin which <br /> showed above normal supplies, the entire state showed below normal supplies. Generally however, supplies have been <br /> adequate to meet demands. <br /> Statewide precipitation for the month of October was 83% of average ranging from a low of 58% of average in the <br /> San Juan/Dolores/Animas basin to a high of 117%of average in the Colorado River basin. The statewide reservoir storage <br /> was 110%of average on November 1. The San Juan/Dolores/Animas basin has the highest storage rate at 125%of average <br /> while the Rio Grande basin has the lowest storage rate at 88% of average. <br /> The National Weather Service 30 day forecast (October 15 through November 15) statewide is for above normal <br /> precipitation and below normal temperatures.The 90 day forecast(starting October 1) is also for above normal precipitation <br /> and below normal temperatures statewide. <br /> The Surface Water Supply Index (SWSI) developed by this office is used as an indicator of water supply conditions <br /> in the state. It is based on stream flow,reservoir storage,and precipitation for the summer period(May 1st through October <br /> 31). Weight factors are applied to each of the measured hydrologic factors in computing the SWSI values for each basin. <br /> During the summer period, streamflow is the primary component in each basin except the South Platte where reservoir <br /> storage is the primary component. The following SWSI values were computed for each of the seven basins on November <br /> 1 , 1991 and 1990: <br /> November 1, 1991 Change From November 1, 1990 <br /> Basin SWSI Value Previous Month SWSI Value <br /> South Platte +1.9 -0.2 +1.8 <br /> Arkansas -0.4 -0.1 +2.6 <br /> Rio Grande -1.0 -3.6 +2.8 <br /> Gunnison -1.4 -0.1 -1.3 <br /> Colorado -0.7 -2.0 -0.6 <br /> Yampa/White -2.2 -1.5 -1.8 <br /> San Juan/Dolores -1.5 -4.7 +2.7 <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 />