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<br />COLORADO WATER SUPPLY REPORT <br />Jack Byers; Keith Vander Horst <br />Colorado Division of Water Resources <br /> <br />COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <br /> <br />November 2002 <br /> <br />FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES <br />ROOM 818,1313 SHERMAN ST" DENVER, CO 80203 <br />303-866-3581; www.water.state.CQ.us <br /> <br />The state enters the 2003 water year with dry conditions statewide, evidenced by all basins having negative SWSI <br />values, The widespread above average precipitation that began in September continued into October over some areas, <br />resulting in select streams experiencing a minor increase in flow, Those basins with increased SWSI values over last <br />month reflect the benefit of those precipitation and stream flow affects, Even though there were some small benefits, all <br />stream flows remain significantly below average, Statewide reservoir storage is also well below normal, at about 52% of <br />average, with only rare instances of individual reservoirs containing above normal amounts, <br /> <br />The Surface Water Supply Index (SWSI) developed by this office and the U,S,D,A, Natural Resources <br />Conservation Service is used as an indicator of mountain-based water supply conditions in the major river basins of the <br />state, It is based on stream flow, reservoir storage, and precipitation for the summer period (May through October), <br />During the summer period, stream flow is the primary component in all basins except the South Platte basin where <br />reservoir storage is given the most weight. The following SWSI values were computed for each of the seven major basins <br />for November 1, 2001, and reflect the conditions during the month of October, <br /> <br />Basin <br />South Platte <br />Arkansas <br />Rio Grande <br />Gunnison <br />Colorado <br />Yampa/White <br />San JuanlDolores <br /> <br />-4 <br />Severe <br />Drought <br /> <br />-3 <br /> <br />-2 <br />Moderate <br />Drought <br /> <br />November 1, 2001 <br />SWSI Value <br />-2,2 <br />-2,5 <br />-2,9 <br />-2,8 <br />-3,5 <br />-3,2 <br />-1,2 <br /> <br />-1 <br /> <br />Scale <br />o <br />Near Normal <br />Supply <br /> <br />Change From <br />Previous Month <br />+0,4 <br />-1,5 <br />+0,3 <br />+0,1 <br />-0,1 <br />-0,2 <br />+1,0 <br /> <br />9 <br /> <br />Change From <br />Previous Year <br />-2,6 <br />-2,0 <br />-1,0 <br />-0,6 <br />-2,2 <br />-1,5 <br />+1,4 <br /> <br />2 <br />Above Normal <br />Supply <br /> <br />3 <br /> <br />4 <br />Abundant <br />Supply <br />