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WSP02638
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Last modified
1/26/2010 12:37:53 PM
Creation date
10/11/2006 11:14:51 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8210.140.20
Description
Colorado River Basin Organizations and Entities - Colorado River Basin States Forum - California
State
CA
Basin
Western Slope
Date
1/1/1981
Author
Myron B Holburt
Title
Annual Report for the Calendar Year 1980
Water Supply Pro - Doc Type
Annual Report
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<br />1702 <br /> <br />would increase its deliveries from that <br />source and reduce its Colorado River <br />deliveries, thus having a like amount <br />credited to its account in Lake Mead. <br />In years of low water supply from the <br />State Water Project, in addition to its <br />annual Colorado River apportionment, <br />Metropolitican would also divert <br />additional water up to the amount <br />credited to its account in Lake Mead. <br />During the year, the Board staff <br />continued working with the staffs of <br />Metropolitan and the Water and <br />Power Resources Service as <br />Metropolitan attempted to adapt the <br />Service's annual simulation computer <br />model of the Colorado River system <br />to Metropolitan's computer. By years <br />end, Metropolitan's staff came to the <br />conclusion that its computer was <br />incompatible with that of the Service, <br />and the efforts to adapt the program <br />were dropped. In lieu thereof, the <br />Board's staff and Metropolitan's staff <br />plan to use the Service's computer to <br />conduct the river operation studies of <br />the banking concept. <br />The Water and Power Resources <br />Service began an investigation entitled <br />"Lower Colorado River Water <br />Conservation and Efficient Use <br />Program, Arizona-California-Nevada- <br />Utah" during 1980. The Service's <br />work plan for this investigation <br />included a study of banking water in <br />Lake Mead as an element that would <br />be studied starting in 1984. Upon <br />receiving a copy of the work plan, the <br />Chief Engineer reminded the Service <br />that it had already been working with <br />the Board on the computer modelling <br />phase of the banking study, and urged <br />the Service to both accelerate its <br />work thereon and to work with the <br />Board on its study which would be a <br />comprehensive analysis. The Service <br />concurred with the Chief Engineer's <br />recommendations on the banking <br />study phase of its investigation. <br /> <br />Possible Additional Colorado River <br />Diversions by Metropolitan Water <br />District <br /> <br />Prior to commencement of Central <br />Arizona Project deliveries, the <br /> <br />Metropolitan Water District may <br />divert about 400,000 acre-feet per <br />year more from the Colorado River <br />than its current level of diversions, up <br />to its contractual entitlement of <br />1,212,000 acre-feet per year. Because <br />of that right, and also due to the <br />temporary availability of low-cost <br />secondary energy from Hoover <br />Powerplant to Metropolitan during <br />1980, the Chief Engineer met with <br />representatives of Metropolitan, <br />Coachella Valley Water District, and <br />Desert Water Agency to discuss the <br />possibility of Metropolitan making <br />advance deliveries of Colorado River <br />water to the two desert area agencies. <br />These agencies have an existing <br />agreement whereby Metropolitan <br />delivers Colorado River water to them <br />in the desert area through its <br />Colorado River Aqueduct in exchange <br />for an equivalent amount of water <br />from the State Water Project <br />delivered to Metropolitan on the <br />Southern California coastal plain. The <br />agreement between the agencies calls <br />for deliveries by Metropolitan of <br />27,884 acre-feet in 1980, increasing to <br />58,373 acre-feet in 1989. This water is <br />to be delivered from the Colorado <br />River Aqueduct in the Whitewater <br />River area to spreading basins so as to <br />percolate into the Coachella Valley <br />ground water basin. <br />By delivering Colorado River water <br />to the spreading basins during the <br />years prior to 1985 in excess of the <br />quantities specified in the agreement, <br />the excess quantities could be <br />accumulated as a stored water credit. <br />/Thereafter, if the stored water would <br />be needed to alleviate a shortage in <br />water supply, Metropolitan could <br />cease its delivery of exchange water <br />to Coachella and Desert and thereby <br />increase the water supplies available <br />to its service area until the stored <br />water was exhausted. <br />The excess deliveries will require <br />construction of additional spreading <br />basins and other facilities, and the <br />agencies are prepared to do the <br />necessary work as soon as a final <br />agreement therefor is entered into by <br />the agencies. <br /> <br />8 <br /> <br />In August, the Department of Water <br />Resources released a report, <br />"Stretching California's Water <br />Supplies: Increased Use of Colorado <br />River Water in California", which <br />focused on the energy savings that <br />would occur if Metropolitan would <br />divert its full contractual entitlement. <br />to Colorado River water and reduce <br />accordingly its State Water Project <br />diversions. The report also identified <br />the proposal discussed above as one <br />of the ways these added deliveries <br />could be stored for later use. The <br />Board's staff provided information to <br />the Department and commented on <br />drafts of the report. <br /> <br />Potential Storage of Colorado River <br />Water in Desert Groundwater Basins <br /> <br />In further consideration of the water <br />supply conditions outlined in the <br />preceding section, Metropolitan also <br />commenced an investigation of the <br />potential for storing Colorado River <br />water in desert groundwater basins <br />along the Colorado River Aqueduct in <br />San Bernardino and Riverside <br />Counties for later withdrawal. <br />In February, the U.S. Bureau of <br />Land Management (BLM) issued a <br />draft report entitled "The California <br />Desert Conservation Area-Plan <br />Alternatives and Environmental Impact <br />Statement". This report could lead to <br />BLM actions that would prevent <br />Metropolitan from storing or <br />withdrawing Colorado River water <br />from the only groundwater basins <br />found to have possibilities for such a <br />plan. This is because portions of the <br />area encompassing those groundwater <br />basins were identified as Wilderness <br />Study Areas and such designations <br />would prevent Metropolitan from <br />implementing a desert groundwater <br />storage program. <br />At a public hearing on the draft <br />report in April by BLM, the Board's <br />Executive Secretary presented a <br />statement which reflected the Board's <br />support of Metropolitan's groundwater <br />storage program and requested BLM <br />to take no actions that would prevent <br />Metropolitan from undertaking <br />activities associated with its <br />
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