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Last modified
7/29/2009 1:55:42 PM
Creation date
3/27/2008 12:36:28 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8040.800
Description
Water Resources for Colorado
State
CO
Date
5/1/2003
Author
US Dept of Agriculture - Natural Resoruces Conservation Service
Title
Colorado Basin Outlook Report May 1, 2003
Water Supply Pro - Doc Type
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<br />Precipitation <br /> <br />April was a dry month for all but the northwest portion of the state. Below average totals <br />were measured in all basins except the Yampa, White, North Platte, and Colorado basins. <br />For the second consecutive month, the lowest precipitation totals were measured in the San <br />Juan, Animas, Dolores, and San Miguel basins where totals of only 57% of average were <br />reported at SNOTEL sites. The highest basinwide precipitation total was measured in the <br />Yampa and White basins at 137% of average for the month. Statewide, totals were 97% of <br />average in April. For the water year, which began on October 1, 2002, percentage of <br />average range from only 77% in the San Juan, Animas, Dolores, and San Miguel basins, to <br />109% in the South Platte Basin. The Colorado Basin is the only other basin reporting an <br />above average water year total at 101 % of average. Statewide water year totals remain the <br />same as last month, at 94% of average. <br /> <br />Reservoir Storage <br /> <br />Reservoir storage continues to show the lingering effect of last year's drought across <br />Colorado. Reservoirs were severely drawn down last summer and remain far from <br />recovery. Statewide, storage volumes dipped to a low point last August at 1.94 million <br />acre-feet below the average mark. Since then, some additional storage progress has been <br />made, but the deficit remains at nearly 1.35 million acre-feet below the average. All basins <br />are reporting well below average volumes, with the lowest percentage reported in the <br />Colorado Basin at only 42%. Volumes in the Arkansas Basin remain nearly as low at only <br />44% of average for this date. Statewide, storage volumes are 60%.of average and are 70% <br />oflast year's May 1 storage. While it's likely we'll see improvements in storage volumes <br />in the coming months as runoff begins, it remains likely we'll see volumes decline as the <br />late summer demands are met. <br /> <br />Streamflow <br /> <br />Only minor adjustments were made in streamflow forecasts across Colorado this month. <br />The most notable changes occurred in the basins of southwestern Colorado, where the <br />below average forecasts were reduced even further this month. Now, forecasts across most <br />of these basins range from only 40% to 55% of average. Volumes of less than 70% of <br />average are also prevalent throughout the Gunnison, White, and Rio Grande basins, and <br />volumes of less than 90% of average prevail throughout the Arkansas, upper South Platte, <br />Yampa, and North Platte basins. The only forecasts that approach average extend through <br />the Colorado River Basin into the northern tributaries of the South Platte Basin. Along the <br />Continental Divide in these basins, runoff volumes are forecast to range from 100% to <br />110% of average. Given these forecasts, there remains little optimism for significant <br />improvement in reservoir storage this year. <br />
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