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SWSIReportAug2008
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SWSIReportAug2008
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Last modified
10/17/2011 1:25:21 PM
Creation date
8/21/2008 11:24:47 AM
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Drought Mitigation
Title
Colorado Water Supply Conditions Update
Date
8/21/2008
Description
August SWSI Report
Basin
Statewide
Drought Mitigation - Doc Type
Presentation
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RIO GRANDE BASIN <br />Basinwide Conditions Assessment <br />The SWSI value for the month was 1.0. Flow at the <br />gaging station Rio Grande near Del Norte was 1372 cfs, as <br />compared to the long-term average of 1320 cfs (102% of <br />normal). The Conejos River near Mogote had a mean flow of <br />578 cfs (122% of normal). Storage in Platoro, Rio Grande, <br />and Santa Maria reservoirs totaled 98% of normal as of the <br />end of July. <br />streamflow in the upper Rio Grande basin was erratic <br />during July. Some areas of the basin experienced above <br />normal streamflow, such as the Conejos River and its <br />tributaries. Other areas produced below average flows such <br />as Saguache Creek, as temperatures fluctuated widely, but <br />settled to the normal slow decline as the winter snowpack <br />melts out <br />In general, the higher elevations and the Valley floor <br />received below average precipitation during July, and for now, <br />the fifth consecutive month. However, the upper Alamosa <br />River drainage received significant rainfall on several days, <br />creating short-term runoff increases or "spikes" in the <br />hydrograph. The duration of these spikes were about 24 hours <br />apiece and, after a week of this pattern, did raise the baseflow <br />condition. <br />Medano Creek, the stream that flows through the Great <br />Sand Dunes National Park, has experienced a very nice runoff <br />year with live flow past the visitor center since late April. Two <br />trans-mountain diversions, the Medano and Hudson Branch <br />Ditches, diverting water from Medano Creek eastward to the <br />Wet Mountain Valley, had their usual shut down July 15. This <br />increased the flow towards the Park temporarily. <br />Most of the other streams in the upper Rio Grande <br />basin have not received enough rainfall to alter the trend <br />towards below average conditions. <br />Outlook <br />The month of July had generally warmer and drier than <br />normal conditions. However, NOAA weather forecasts for the <br />next month and beyond call for wetter and cooler than normal <br />conditions with particularly high possibility for rainfall the first <br />two weeks of August. <br />Administrative/Management Concerns <br />July had normal administrative duties with reservoir <br />releases, streamflow measurement, headgate diversion record- <br />keeping, and well measurement rule compliance checking. <br />Public Use Impacts <br />Although the runoff season was better than normal, <br />many irrigators felt the pinch of dry conditions and ditches <br />going out of priority. Well pumping increased as surface water <br />supplies dwindled and temperatures rose. <br />4 <br />3 <br />W <br />1 <br />W <br />J <br />Q <br />> 0 <br />x <br />W <br />0 <br />Z <br />-1 <br />} <br />0 <br />-~ <br />-3 <br />1,200,000 <br />1,~,~ <br />Q ~°,°°° <br />0 <br />~ ~~~ <br />W <br />~,~ <br />U ~~ <br />Aug-08 <br />RIO GRANDE @ASIN SWSI HISTORY <br />RIO GRANDE NR DEL NORTE, FLOW BY V1~TER YEAR <br />~ U~Ef (1987) ~ DRY (2002) ~ AVG ~ 2008 <br />5 <br />Jarr99 Jan-0D Jan-D1 Jan-02 Jarr03 Jan-04 JarrD5 JarF06 Jarr07 JarF08 <br />MONTHIYEAR <br />0 <br />Oct Nov Dec Jan Feb March April May June July Aug Sept <br />
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