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COLORADO WATER SUPPLY CONDITIONS REPORT <br /> May 15, 1990 <br /> Precipitation is for the month of April . Both high elevation and low <br /> elevation precipitation data are included. Reservoir storage and snowpack <br /> conditions were measured on May 1, 1990. <br /> *Conditions as a Percentage of Normal <br /> Reservoir <br /> Basin Storage Precipitation Snowpack <br /> South Platte 102% 82% 96% <br /> Arkansas 122% 240% 79% <br /> Rio Grande 88% 264% 63% <br /> Gunnison 146% 246% 64% <br /> Colorado 86% 124% 73% <br /> Yampa/White N/A 105% 69% <br /> San Juan/Dolores 95% 220% 59% <br /> The Surface Water Supply Index (SWSI) developed by this office is used as an <br /> indicator of water supply conditions in the state. It is based on reservoir <br /> storage, streamflow, and precipitation for the summer period (May 1 - December <br /> 1) and reservoir storage, snowpack, and precipitation for the winter period <br /> (December 1 - May 1) . Weight factors are applied to each of the measured <br /> hydrologic components in computing the SWSI values. These computations are <br /> based on the probability of non-exceedence of individual components; that is, <br /> the probability that a measured value is equal to or less than the historic <br /> average. During the winter period, snowpack is the primary component in each <br /> basin except the South Platte. The following SWSI values were computed for <br /> each of the seven basins on May 1, 1990: <br /> Change from <br /> Basin SWSI Value Apr. 1, 1990 <br /> South Platte -0.8 -0.3 <br /> Arkansas -0.8 +1.5 <br /> Rio Grande -0.5 +2.3 <br /> Gunnison -1.4 +1.4 <br /> Colorado -1 .7 +0.2 <br /> Yampa/White -2.6 -0.8 <br /> San Juan/Dolores -1.7 +1.5 <br /> SCALE <br /> -4 -3 -2 -1 0 +1 +2 +3 +4 <br /> Severe Moderate Below Near normal Above normal Abundant <br /> drought drought normal supply <br /> *Data provided by the Soil Conservation Service, Snow Survey Office (Denver), <br /> U.S. Department of Agriculture <br />