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WSP06278
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Last modified
1/26/2010 2:22:02 PM
Creation date
10/12/2006 1:32:10 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8040.970
Description
Drought Preparedness
State
CO
Basin
Statewide
Date
6/1/2002
Author
USDA
Title
Colorado Basin Outlook Report
Water Supply Pro - Doc Type
Report/Study
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<br />0019fJ5 <br /> <br />SAN MIGUEL, DOLORES, ANIMAS, AND SAN JUAN RIVER BASINS <br />as of June 1, 2002'.' <br /> <br />Mountain Snowpack* (Inches) <br /> <br />Precipitation" (% of average) <br /> <br />__current --'-Average <br />__Maximum __Minimum <br /> <br />I I <br />I_Monthly IIlIYear-to-date I <br /> <br /> 45 <br /> 40 <br /> 35 <br />.5 30 <br />..: <br />c <br />!! 25 <br />.. <br />.~ <br />:l <br />.,. 20 <br />W <br />~ <br />.l!l <br />~ 15. <br /> 10 <br /> 5 <br /> 0 <br /> Jan Feb <br />'Based on selected stations <br /> <br /> <br /> 100 <br /> 90 <br /> 80 <br />.. 70 <br />Cl <br />I! 60 <br />.. <br />> <br />< <br />'0 50 <br />.. <br />c <br />.. 40 <br />~ <br />.. <br />Do 30 <br /> 20 <br /> 10 <br /> 0 <br /> Oct Nov Dee Jan Feb Mar Apr May <br /> <br /> <br />Mar Apr May Jun <br /> <br />I; <br /> <br />Out of the 16 SNOTEL snow measuring sites in these basins, none of them has any measurable <br />snow remaining at them on June 1. By mid-May, the warm temperatures and dry conditions had <br />melted out what was left of the record low snowpack leaving extremely dry slopes nearly two <br />months before the average melt out date. Precipitation during April was only 10% of the average <br />for the month. The water year total is only 45% of average, which is only 46% of the amount of <br />precipitation last year by June 1. Reservoir storage has been diminished much further since last <br />month to only 57% of average volume. There is only 57% of the amount stored that there was <br />last year at this time. Given that most of the snow has melted away long ago, combined with the <br />warm, dry conditions, the streamflow forecasts have been reduced below last month's already <br />dismal forecast. Forecast range from only 9% of average at the Inflow to Navajo Reservoir, to <br />24% of average on the San Miguel River near Placerville. <br />
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