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<br />COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <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.co.us <br /> <br />September 2007 <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. <br /> <br />The statewide SWSI values for the month range from a high value of 2.8 in the San Juan/Dolores Basin to a low <br />value of -2.5 in the Yampa/White Basin. Six of the basins (South Platte, Arkansas, Rio Grande, Colorado, Yampa/White, <br />and San Juan/Dolores) experienced a gain from the previous month's values. One of the basins (Colorado) experienced <br />a loss from the previous month's values. <br /> <br />The following SWSI values were computed for each of the seven major basins for September 1, 2007, and reflect <br />the conditions during the month of August 2007. <br /> <br />Basin <br />South Platte <br />Arkansas <br />Rio Grande <br />Gunnison <br />Colorado <br />Yampa/White <br />San Juan/Dolores <br /> <br />-4 <br />Severe <br />Drought <br /> <br />-3 <br /> <br />-2 <br />Moderate <br />Drought <br /> <br />September 1 , 2007 <br />SWSI Value <br />+2.2 <br />+1.4 <br />+1.2 <br />- 1.2 <br />- 0.1 <br />- 2.5 <br />+2.8 <br /> <br />-1 <br /> <br />Scale <br />o <br />Near Normal <br />Supply <br /> <br />Change From <br />Previous Month <br />+0.9 <br />+0.8 <br />+0.7 <br />- 0.7 <br />+0.9 <br />+1.2 <br />+3.2 <br /> <br />Change From <br />Previous Year <br />+0.8 <br />+2.9 <br />+3.0 <br />- 1.8 <br />+1.0 <br />- 1.9 <br />+4.7 <br /> <br />2 <br />Above Normal <br />Supply <br /> <br />3 <br /> <br />4 <br />Abundant <br />Supply <br />