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<br />~~ Q/0 J1 <br />~ "it II'-! <br />'" <br /> <br />/ <br /> <br />f\"I~ \\?5 <br />oJ 'J.:" ..,1....... <br /> <br />.,' <br /> <br />COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <br /> <br />. 1 <br />! <br /> {. <br /> i <br /> ':} <br /> <br />FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES <br />ROOM 818, 1313 SHERMAN ST" DENVER, CO 80203 <br />303-886-3581; www.water.state.co.us <br /> <br />December 2000 <br /> <br />December 1 marks the beginning of the winter period for Surface Water Supply Index (SWSI) calculation, During' <br />this period, the SWSI calculation shifts from integrating the summer stream flow to utilizing the. winter snowpack, !. <br />Snowpack throughout the state, as of December 1,2000, ranged from 74% of normal in the South Platte Basin to 129% of . <br />normal in the San Juan/Dolores Basin, The statewide average snowpack was 84% of normal. ContinuE!d snowpack ; <br />accumulation will be key to recovering from this summer's drought and ensuring adequate water supplies for next <br />irrigation season, <br /> <br /> <br />The Surface Water Supply Index (SWSI) developed by this office and the U,S.DA 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 snowpack, reservoir storage, and precipitation for the winter period (November through April), <br />During the winter period, snowpack is the primary component in all basins except the South Platte basin where reservoir: <br />storage is given the most weight. The following SWSI values were computed for each of the seven major basins for .... <br />December 1,2000, and reflect the conditions during the month of November. <br /> <br />Basin <br />South Platte <br />Arkansas <br />Rio Grande <br />Gunnison <br />Colorado <br />YampalWhite <br />San Juan/Dolores <br /> <br />December 1, 2000 <br />SWSI Value <br />-1,7 <br />-1.8 <br />1.4 <br />-1,8 <br />-1,8 <br />-1.4 <br />0,5 <br /> <br />Change From <br />Previous Month <br />-3,1 <br />-2,2 <br />+2.4 <br />-0,1 <br />-1,5 <br />-0.4 <br />+1.1 <br /> <br />-4 <br />Severe <br />Drought <br /> <br />Scale <br />o <br />Near Normal <br />Supply <br /> <br />1 <br /> <br />-3 <br /> <br />-2 <br />Moderate <br />Drought <br /> <br />-1 <br /> <br />Change From <br />Previous Year <br />-2,5 <br />+0,9 <br />+5,1 <br />+1,9 <br />+1,3 <br />+2,1 <br />+3,8 <br /> <br />2 <br />Above Normal <br />Supply <br /> <br />3 <br /> <br />4 <br />Abundant <br />Supply <br /> <br /> <br />, <br />