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<br />SURFACE WATER SUPPLY INDEX <br />DECEMBER 1,1996 <br /> <br />South Platte <br /> <br /> <br /> <br /> <br />Yampa-White <br /> <br /> 1.5 I ~ Major Rivers <br /> ~sln Boundary <br />Colorado I X X I SWSI Number <br />2.9 +4 <br /> I 1.6 Abundant Supply <br /> +3 <br /> Near Normal <br /> 0 <br /> ~nsas Moderate Drought <br /> 03 <br /> Severe Drought <br /> -4 <br /> <br /> <br />The Surface Water Supply Index (SWSI) is a weighted value derived for each major basin which <br />generally expresses the potential availability of the forthcoming season's water supply. The <br />components used in computing the index are reservoir storage, snowpack water equivalent, and <br />precipitation. The SWSI number for each basin ranges from a -4.00 (prospective water supplies <br />extremely poor) to a + 4.00 (prospective water supplies plentiful). The SWSI number is only a <br />general indicator of surface water supply conditions. Further data analysis may be required in <br />specific situations to more fully understand the impacts of abnormally dry or wet conditions <br />suggested by the SWSI. Development of the SWSI has been a cooperative effort between the <br />Colorado State Engineer's Office and the Natural Resources Conservation Service. <br />