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Colorado Water Supply Oulook Report April 1 2003
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Colorado Water Supply Oulook Report April 1 2003
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Last modified
8/16/2012 2:34:03 PM
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8/16/2012 1:47:26 PM
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Water Supply Protection
Description
Colorado Water Supply Oulook Report April 1 2003
State
CO
Date
4/1/2003
Title
Colorado Water Supply Oulook Report April 1 2003
Water Supply Pro - Doc Type
Report/Study
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=t <br />•e +3 <br />Precipitation <br />Most of Colorado's March precipitation arrived -in the single mid -month blizzard. Thii <br />storm increased the monthly totals to above average in all basins except the Gunnison an( <br />the San Juan, Animas, Dolores, and San Miguel. As expected, the biggest winner was th <br />South Platte Basin, which reported 204% of its average for the month. The Arkansas an <br />Colorado basins followed with 139% and 131% of average, respectively. For the state <br />precipitation was 123% of average in March.. The storm also improved the water yea <br />totals in those favored basins. The South Platte Basin's water year total is now 113% o: <br />average. Other basins reporting at least 90% of average for the water year include the <br />Arkansas, Yampa and White, and Colorado. Of the six months that have lapsed in the <br />2003 water year, only December and January have been well below average, wh6: <br />November was just slightly below average. Statewide water year totals ate 94% o': <br />average. <br />Reservoir Storage <br />Reservoir storage continues to track at well below average volumes across the state. Las <br />year's extremely low inflows, coupled with heavy summer demands, brought storag <br />volumes . to levels that will most likely require several above average runoff years t restore. Unfortunately, even with the improved runoff forecasts, it remains unlikely tha <br />significant progress will be made in recovering storage volumes this year. As of April 1 <br />the state's reservoir storage remains at only 57% of average and is only 64% of last year' <br />storage on this date. Only the Gunnison Basin has significantly recovered from la: <br />summer's depletions and is now 81% of average. The state's lowest volumes, as a percer <br />of average, were measured in the Colorado Basin, at only 36 % of average. Since last Jul-, <br />when storage volumes bottomed out for the year, the state's deficit has improved by near] <br />500,000 acre -feet. However, it would require an increase of nearly three -times that amour <br />to bring storage volumes back to average. <br />Streamflow <br />Streamflow forecasts improved nearly statewide this month. Those locations affected t <br />the blizzard improved the most, with an improvement of about 20% from last month <br />forecasts. However, even with those large improvements, most locations can continue + <br />expect below average runoff for the summer season. Those basins where the forecas <br />improved the most include the South Platte tributaries along the Front Range, the enti <br />Arkansas Basin, and the upper reaches of the Colorado Basin. For the most pa <br />streamflow volumes in these basins are expected to be between 90% to 110% of averag <br />Towards the southwest, forecasts drop off significantly and remain well below averag <br />Across the San Juan, Animas, Dolores, San Miguel and Upper Rio Grande basins, foreca: <br />range from only 50% to 70% of average. Water users in those basins will most certain <br />face water shortages again this year. <br />
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