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COLORADO WATER SUPPLY CONDITIONS REPORT <br /> February 12, 1990 <br /> Precipitation is for the month of January. Both high elevation and low <br /> elevation precipitation data are included. Reservoir storage and snowpack <br /> conditions were measured on February 1, 1990. <br /> Conditions as a Percentage of Normal <br /> Reservoir <br /> Basin Storage Precipitation Snowpack <br /> South Platte 103% 145% 80% <br /> Arkansas 103% 199% 62% <br /> Rio Grande 85% 107% 26% <br /> Gunnison 128% 55% 44% <br /> Colorado 79% 40% 71% <br /> Yampa/White N/A 50% 80% <br /> San Juan/Dolores 128% 55% 23% <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 February 1, 1990: <br /> Change from <br /> Basin SWSI Value Jan. 1, 1990 <br /> South Platte -0.5 +0.1 <br /> Arkansas -1.8 -1.7 <br /> Rio Grande -3.6 -0.2 <br /> Gunnison -2.8 -0.2 <br /> Colorado -2.5 -1.1 <br /> Yampa/White -1.4 -2.9 <br /> San Juan/Dolores -3.6 -0.1 <br /> SCALE <br /> -4 -3 -2 -1 0 +I +2 +3 +4 <br /> Severe Moderate Below Near normal Above normal Abundant <br /> drought drought normal supply <br />