WSP13019 ‎(2)‎

• File Number: 8040.800
• Description: Colorado Water Resources
• State: CO
• Basin: Statewide
• Date: 7/1/1999
• Author: Division of Water Resources
• Title: Colorado Water Supply Conditions Update Reports
• Water Supply Pro - Doc Type: Data

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COLORADO
WATER SUPPL YCONDITIONS U-PDATE

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FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES
ROOM 818,1313 SHERMAN ST., DENVER, CO 80203
303.866.3581; Vv'WW.water.state.co.us

December 1, 200-1 -

This month begins the winter Surface Water Supply Index (SWSI) calculation.- In the winter, the SWSI calculation -
takes into account the regional snowpack in replacement of stream flows. The SWSllndex was below normal' in all
divisions across the state during November. Reservoir index factors and snowpack factors were both below normal
averages for this time of the year. The snowpack ranged from 44% of average in the Rio Grande Basin to 79% of
average in the Gunnison Basin.

The Surface Water Supply Index (SWSI) developed by this office and the U~S.D.A. Natural Resources '
Conservation Service is used as an indicator of mountain-based water supply conditions in the major river baSins of the
state. It is based on snowpack. reservoir storage, and precipitation for the winter period (November thr.Ough Aprit). "
During the winter period. snowpack is the primary component in all basins except the South pjatte- basin Wh~e~ei'Voir_
storage is given the most weight. The following SWSI values were computed for each of the seven major basins _ for - ,
December 1, 2001, and reflect the conditions during the month of November.

Dee 1, 2001 Change From Change From
Basin SWSI Value Previous Month Previous Year
South Platte -2.4 -2.8 -0.7
Arkansas -2.0 -1.5 -0.2
Rio Grande -2.8 -0.9 -4.2
Gunnison -1.2 1.0 0.6-
Colorado -1.8 -0.5 0.0
YampalWhite -1.8 -0.1 -0.4
San JuanlDolores -1.1 1.5 -1.6 --
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Scale
-4 -3 -2 -1 0 1 2 3 A
Severe -Moderate Near Normal Above Normal Abundant y-
Drought _ Drought Supply Supply Supply

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