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WSP13014
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Last modified
1/26/2010 4:34:40 PM
Creation date
4/3/2008 10:26:36 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.600.10.B
Description
2003 Annual Operating Plan
Basin
Colorado Mainstem
Author
USDOI/BOR
Title
2003 Annual Operating Plan for Colorado River System Reservoirs
Water Supply Pro - Doc Type
Operating Principles/Plan
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<br />Under the most probable inflow conditions during water year 2003, Lake Mead will be at its <br />maximum elevation of 1155.31 feet (352 meters) at the end ofF ebruary 2003 and will decline during <br />the water year to reach its minimum elevation of1138.19 feet (347 meters) at the end of September <br />2003. Releases from Lake Mead for water year 2003 are projected to be 10.0 maf(12,335 mcm). <br />For the purpose of projections, all estimated release amounts for CY 2003 are based on the Full <br />Domestic Surplus condition as the criterion governing the operation of Lake Mead. No flood control <br />releases are required during water year 2003 under any of the three inflow scenarios. <br /> <br />The Interim Surplus Guidelines Record of Decision included ESA conservation measures. One such <br />conservation measure specified in Article X( 4)(2) includes provisions for spawning razorback <br />suckers in Lake Mead. Reclamation continues to provide funding and support for the ongoing Lake <br />Mead Razorback Sucker study. The focus of the study has been on locating populations of <br />razorbacks in Lake Mead, documenting use and availability of spawning areas at various water <br />elevations, continuing ageing studies and confirming recruitment events. No changes in operations <br />were made in water year 2002 to provide rising spring water surface elevations for spawning <br />razorback suckers as there were no equalization or BHBF releases during this timeframe. Based on <br />the anticipated operation of Lake Powell for water year 2003, no changes in operations to provide <br />rising elevations are expected in the spring of 2003. <br /> <br />Lakes Mohave and Havasu <br /> <br />At the beginning of water year 2002, Lake Mohave was at an elevation of 639.64 feet (194.96 <br />meters), with an active storage of 1.608 maf (1,983 mcm). The water level of Lake Mohave was <br />regulated as needed between elevation 634 feet (193.24 meters) and 645 feet (196.06 meters) <br />throughout the water year, ending at an elevation of638.5 feet (194.6 meters) with 1.576 maf(1,944 <br />mcm) in storage. The total release from Lake Mohave through Davis Dam was 10.3 maf(l2,705 <br />mcm) for downstream water use requirements. <br /> <br />For water year 2003, Davis Dam is expected to release 9.7 maf (11,965 mcm). For purposes of <br />projections, all estimated release amounts for CY 2003 are based on the Full Domestic Surplus <br />condition as the criterion governing the operation of Lake Mead. The water level in Lake Mohave <br />will be regulated between an elevation of 630 feet (192 meters) and 643 feet (196 meters). <br /> <br />Lake Havasu started water year 2002 at an elevation of447.33 feet (136.35 meters), with 0.567 maf <br />(699 mcm) in storage. The water level of Lake Havasu was regulated as needed between elevation <br />445 feet (135.6 meters) and 449 feet (136.9 meters). During the year, 7.3 maf(9,004 mcm) was <br />released from Parker Dam. In addition to the releases from Parker Dam, 1.6 maf(1,973 mcm) was <br />diverted from Lake Havasu for the Central Arizona Project (CAP) and 1.28 maf (1,579 mcm) by the <br />Metropolitan Water District (MWD). <br /> <br />F or water year 2003, Parker Dam is expected to release 7.2 maf (8,881 mcm). Diversions from Lake <br />Havasu by MWD and CAP are expected to be 1.19 maf(1,480 mcm) and 1.43 maf(1,764 mcm), <br />respectively. <br /> <br />Mohave and Havasu Reservoirs are scheduled to be drawn down in the late summer and winter <br />months to provide storage space for local storm runoff and will be filled in the spring to meet higher <br /> <br />December 13,2002 <br /> <br />17 <br />
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