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WSP03527
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Last modified
1/26/2010 12:50:53 PM
Creation date
10/11/2006 11:47:11 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
822.600.10
Description
Colorado River Annual Operating Plan - Annual Reports
Basin
Colorado Mainstem
Date
1/1/2003
Author
USDOI/BOR
Title
Annual Operating Plan
Water Supply Pro - Doc Type
Annual Report
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<br />I <br />I <br />I <br /> <br />months. In dr;.' years. the 300 efs for the ~.mile reach can be reduced as agreed to by the :>'10;\ <br />parties. In extremely dry years, the 300 cfs through the Black Canyon can be reduced (0 as Iitlle as <br />200 cfs. although other downstream requirements such as senior water rights could require more <br />flow. Under the most probable inflow conditions. flows through the Black Canyon cfthe Gunnison <br />National Park will be above the minimum release objective during the summer months. To protect <br />both the blue ribbon trout fishery in the Black Canyon and recreational interests. releases during <br />2003 will be planned to minimize large fluctuations in the daily and monthly flows in the Gunnison <br />River below the Gunnison Tunnel diversion. <br /> <br />I <br />I <br /> <br />Under the minimum probable and most probable inflow scenarios. Blue Mesa Reservoir is nOl <br />expected to fill in the summerof2003. With the most probable inflow. Blue ~lesa Resen'oirwill fill <br />to v,'ilhin about 12 feet of full pool in July 2003. <br /> <br />I <br /> <br />I <br /> <br />;\'avajo Reservoir <br /> <br />I <br />I <br /> <br />Exceptional droughl conditions prevailed in the San Juan River basin in 1002 with extremely low <br />runofTin the basin. The April through July unregulated inflow into Navajo Reservoir in water year <br />2002 was 0.038 maf(46.9 mcm). or 4 percent of average. Water year 1002 unregulated inflO\... was <br />0.116 maf(143 mcm) or 10 percenr of average. This inflow was significantly below the previously <br />recorded tow. which occurred in 1977. The San Juan River basin is in an extended dry cycle. April <br />through July unregulated inflow to Navajo Reservoir in water years 1999,2000. and 2001 \"'as 81. <br />44. and 107 percent of average. respeclively. Resen'oir storage in Navajo Resen'oir has been <br />significantly reduced due to these protracted drought conditions. Reservoir storage on September 30. <br />2002 was 51 percent of capacity. The water surface elevation at Navajo Reservoir on September 30, <br />2002 was 6.015.6 feet (1.833.6 meters). 69,4 feet from full. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The final report titled Flow Recommendations for the San Juan River. (Flo\\.' Recommendations) <br />which outlines flow recommendations for the San Juan River below Navajo Darn. was completed by <br />the Biology Committee of the San Juan River Basin Recovery Implementation Program (SJRIP) in <br />t\1ay 1999. The report s:nthesizes research conducted on endangered fish in the San Juan River <br />over a 7-year period. The purpose oflhe report is to provide flow recommendations for the San Juan <br />River Ihat promote the recovery of the endangered Colorado pikeminnow and razorback sucker. <br />maintain important habitat for these two species. as well as the other native species. and provide <br />infomlation for the evaluation of continued water development potential in the basin. It is <br />anticipated that implementation of the Flow Recommendations. or reasonable alternative to it. will <br />allow for a non-jeopardy biological opinion to be issued by the Scryice for the operations of Navajo <br />Dam. <br /> <br />I <br />I <br />I <br /> <br />Due to the severity of the drought and the hydrologic conditions in the San Juan River Basin during <br />the spring runoff period. the Flow Recommendations directed that no spring peak release was <br />necessary from Navajo Reservoir. Although there was no peak release. higher than nornlal base <br />flows were released from !'\a\'ajo Resen'oir during the spring and summer months during water year <br />2002. Releases from Navajo Reseryoir reached 1.000 cfs (28 ems) during this period. These <br />increases were necessary due 10 decreasing flows in the San Juan River endangered fish critical <br /> <br />December 13. 2002 <br /> <br />13 <br />
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