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<br />~ ~"! 'J~0
<br />J _.~ RECEIVED
<br />JUN 182001 COLORADO
<br />CoIoradoWatetconseWAfER SUPPLY CONDITIONS UPDATE
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<br />June 2001
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<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 />A warm, dry May led to a dramatic decline in snowpack statewide, from 84% of normai as of May 1, to 24% of'
<br />normal by the end of the month, Consequently, stream flows peaked early, Reservoir storage ranges from 91% in the' .
<br />South Piatte Basin to 133% in the Rio Grande Basin, boding well for maintaining adequate water supplies throughout the!'
<br />summer. However, the YampalWhite basin, with minimal reservoir storage available, will be' most reliant upon r
<br />precipitation to augment the iow water supplies, This month the calculation of the Surface Water Supply Index changes; .
<br />from utilizing snowpack to stream flow, which primarily accounts for the increases seen from last month's values,'
<br />
<br />The Surface Water Supply Index (SWSI) developed by this office and the U,SD.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 1
<br />for June 1, 2001, and reflect the conditions during the month of May,
<br />
<br />Basin
<br />South Platte
<br />Arkansas
<br />Rio Grande
<br />Gunnison
<br />Colorado
<br />YampalWhite
<br />San JuanlDolores
<br />
<br />-4
<br />Severe
<br />Drought
<br />
<br />-3
<br />
<br />-2
<br />Moderate
<br />Drought
<br />
<br />June 1, 2001
<br />SWSI Value
<br />2,3
<br />2,7
<br />3,0
<br />0,9
<br />-0,9
<br />-0.9
<br />2,8
<br />
<br />Change from
<br />Previous Month
<br />+2,2
<br />+4.3
<br />+2,1
<br />+2.4
<br />+0,8
<br />+1,9
<br />+3.0
<br />
<br />Change from
<br />Previous Year
<br />+1,0
<br />+0.5
<br />+4,9
<br />-0,7
<br />-0,7
<br />-2:0
<br />+2;6
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<br />Scale
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<br />Near Normal
<br />Supply
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<br />1
<br />
<br />2
<br />Above Normal
<br />Supply
<br />
<br />3
<br />
<br />4
<br />Abundant
<br />Supply
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