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SWSIReportNov2006
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SWSIReportNov2006
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Last modified
10/18/2011 11:31:30 AM
Creation date
10/12/2007 10:07:22 AM
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Template:
Drought Mitigation
Title
Colorado Water Supply Conditions Update
Date
11/20/2006
Description
Water Availability Task Force Meeting Presentation
Basin
Statewide
Drought Mitigation - Doc Type
Presentation
Document Relationships
ClimateUpdateNov2006
(Attachment)
Path:
\Drought Mitigation\Backfile
LongTermOutlookNov2006
(Attachment)
Path:
\Drought Mitigation\Backfile
NRCSNov2006
(Attachment)
Path:
\Drought Mitigation\Backfile
WATFAgendaNov2006
(Attachment)
Path:
\Drought Mitigation\DayForward
WATFMeetingSummaryNov2006
(Attachment)
Path:
\Drought Mitigation\DayForward
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<br />RIO GRANDE BASIN <br /> <br />Basinwide Conditions Assessment <br />The SWSI value for the month of September was <br />3.8. Flow at the gaging station Rio Grande near Del Norte <br />averaged 1450 cfs (3000/0 of normal). The Conejos River near <br />Mogote had a mean flow of 421 cfs (3630/0 of normal). <br />Precipitation during October in Alamosa was 1.59 inches, 0.92 <br />inches above normal. Rain in the valley and snowfall in the <br />mountains during October 7 through October 9 dramatically <br />increased streamflow and got the winter snow pack off to a <br />great start. <br />The Rio Grande near Del Norte rose from 500 cfs to <br />nearly 2700 cfs in less than 24 hours on October 7. And <br />higher flows lingered through the end of the month. The <br />October total volume was nearly 90,000 acre-feet, the highest <br />October total since 1916. Amazingly, the October amount was <br />greater than the June runoff total this year. <br />That storm system also affected the Conejos River <br />and its tributaries. The monthly total volume of nearly 26,000 <br />acre-feet was the highest since 1904. <br /> <br />Outlook <br />After a poor runoff period of April through June, <br />precipitation in the basin during July through October radically <br />improved the soil moisture and stream flow conditions in the <br />Rio Grande Basin. Despite the quick start to the winter <br />snowpack, a glance at the conditions during the first week of <br />November indicates most of the upper Rio Grande basin is <br />beginning to lag behind normal. <br /> <br />Administrative/Manaqement Concerns <br />Reservoirs in the basin reduced outflows and began <br />storing inflow as October came to a close. The early summer <br />irrigation demand drained most of the storage in the basin's <br />reservoirs. <br />Although the huge increase this fall in the indexed <br />streamflow under the Rio Grande Compact required many <br />administrative adjustments, Colorado is very likely to deliver <br />the amount required this year without much excess. The final <br />results won't be available until January. <br />Compliance with the requirements for metering wells <br />decreed or permitted over 50 gpm is a major activity in the <br />San Luis Valley at this time. Case No. 05CW12, confirmed by <br />the Water Court back in July, requires installation of approved <br />measurement devices and submission of the required forms <br />for all high capacity wells in Water Division 3 by March 1, <br />2007. <br /> <br />Nov-06 <br /> <br />RIO GRANDE BASIN SNSI HISTORY <br /> <br />4.0 <br /> <br /> <br />3.0 <br /> <br />2.0 <br /> <br />I- <br />W <br />S <br /> <br />1.0 <br /> <br />w <br />:3 <br /><( <br />> 0.0 <br />>< <br />w <br />o <br />z <br />- -1.0 <br />>- <br />0:: <br />o <br />-2.0 <br /> <br />-3.0 <br /> <br />-4.0 <br />Jarl-97 Jan-98 Jarl-99 Jarl-OO Jarl-01 Jarl-02 Jan-03 Jarl-04 Jan-05 Jarl-OO <br /> <br />rvDNTH I YEAR <br /> <br />RIO GRANDE NR DELNORTE, FLOW BY WATER YEAR <br /> <br />300,000 <br /> <br /> <br />Q) 250,000 <br />(1) <br />LL <br />a, <br />~ 200,000 <br /> <br />s- <br />o <br />Li 150,000 <br />w <br />> <br />i= <br />::s 100,000 <br />::J <br />~ <br />::J <br />u 50,000 <br /> <br />o <br />Oct <br /> <br />r-.bv <br /> <br />ca:: <br /> <br />Jan <br /> <br />Feb <br /> <br />March <br /> <br />April <br /> <br />---e- V\ET (1987) <br /> <br />--I:r-- A VG <br /> <br />~2007 <br /> <br />---+-- DRY (2002) <br /> <br />REPRESENTAllVE RESERVOIRS <br /> <br />25,000 <br /> <br /> <br />20,000 <br /> <br />Q) <br />~ <br />a, <br />~ 15,000 <br />(1)- <br />Ol <br />co <br />o <br />~ 10,000 <br />::c <br />co <br />(/) <br />::J <br /> <br />5,000 <br /> <br />o <br /> <br />Rio Grande <br /> <br />P1atoro <br /> <br />SantaM3ria <br /> <br />. Avg.1 0/31 Contents <br /> <br />.10/31/06 Contents <br /> <br />5 <br />
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