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WSP09347
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Last modified
7/29/2009 9:48:29 PM
Creation date
10/12/2006 3:35:09 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8040.970
Description
Basin Outlook Reports
State
CO
Date
1/1/2002
Author
USDOA
Title
Colorado Basin Outlook Report
Water Supply Pro - Doc Type
Publication
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<br />Precipitation <br /> <br />Mountain precipitation across Colorado was below average statewide during February. During the past <br />12 months, Colorado precipitation measured at SNOTEL sites has exceeded the average in only two <br />months. Those months were April and August 2001. During that same year, statewide precipitation <br />was less than 65% of average during six of those months. FebruarY's statewide precipitation was only <br />56% of average. As expected, totals for the 2002 water year (since October 1,2001) are well below <br />average, statewide. Basinwide water year percentages range from only 49% of average in the San Juan, <br />Animas, Dolores, and San Miguel basins, to a high of only 70% of average in the Yampa and White <br />basins. As of March I, the statewide water year totals are only 63% of average. <br /> <br />Reservoir Storage <br /> <br />While reservoir storage volumes improved slightly from last month, they remain below average across <br />most of the state. Only the Gunnison and Yarnpa basins can boast of a reservoir storage that slightly <br />exceeds the average mark for this date. Statewide, reservoir storage is only 88% of average and is only <br />90% of last year's March I volumes, Not since 1982 has the March storage dipped to below average <br />volumes. In the Arkansas Basin, which is currently reporting a storage volume of 78 % of average, this <br />is the first winter since 1992 that storage has dropped below average. Since that year, volumes have <br />been tracking at nearly 200% of average. On the brighter side, statewide volumes have been steadily <br />improving since November 2001 when a deficit of 615,000 acre-feet was reported. As of this month, <br />this deficit has been reduced to 410,000 acre-feet. <br /> <br />Streamflow <br /> <br />Given the climatic conditions of the past six months, it's not surprising that Colorado's outlook for <br />spring and summer water supplies is pretty dismal. The entire state can expect below average runoff <br />this season, with a number of locations where streamflow volumes will be less than 50% of average, <br />Those areas of most concern include the San Juan, Animas, Dolores, and Rio Grande basins of <br />southwestern Colorado. Across northern Colorado, the South Platte headwaters and the North Platte <br />Basin can also expect less than 50% of average runoff this year. Most of the tributary streams of the <br />Colorado River are forecast to produce the highest volumes as a percent of average. Those basins, <br />which are all forecast at about 70% to 80% of average, include the Fryingpan, Eagle, Blue, Williams <br />Fork and the inflow into Lake Granby, Across the remainder of the state, runoff volumes are projected <br />to range from only 50% to 70% of average. Water users need to carefully consider their supply <br />situation and plan accordingly for one of Colorado's dryer water years on record. <br />
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