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Last modified
8/16/2009 3:00:53 PM
Creation date
10/4/2006 6:53:56 AM
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Board Meetings
Board Meeting Date
5/19/2003
Description
WSP Section - Colorado River Basin Issues - Coordinated Facilities Operations Study
Board Meetings - Doc Type
Memo
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<br /> <br />\" <br /> <br /> <br />Agenda Item 27 - Coordinated Facilities <br />May 19-20, 2003 Board Meeting <br />Page 2 of 12 <br /> <br />operations). Following the analysis, the agreements andldr operating protocols will be developed, . <br />as needed. The analysis should be completed by September 2000 and agreement on implementation <br />reached by March 2001. An example of the benefits of this proposal is that if an additional 20,000 <br />acrejeet is released in a given year, it would augment spring peakflows by approximately 1,000 cft <br />for 10 days in the IS-Mile Reach. <br /> <br />Reproductive success and natural recruitment are dependent on high spring flows to create and <br />maintain habitat. Augmentation of the spring peak is an essential recovery action upon which the <br />Recovery Program depends to avoid the likelihood of jeopardy and adverse modification of critical <br />habitat. Increased spring peak flows in the IS-Mile Reach, would likely benefit all reaches <br />downstream to Lake Powell. " <br /> <br />Thus, the primary purpose of the Coordinated Facilities Study (CFOPS) is to investigate <br />alternatives for supplying an average of20,000 acre-feet of water to the IS-Mile Reach of the <br />Colorado River during years with spring peak flows between 12,900 cfs and 26,600 cfs. The water <br />supplied is in addition to other sources identified in the RIPRAP and will be done on a voluntary <br />basis without diminishing usable project yield or causing project sponsors to incur significant costs. <br />The water will be made available to supplement spring pe;U<: flows by about 1,000 cfs/day over a 10- <br />day period. A secondary purpose is to enhance flows in the IS-Mile Reach during the late summer <br />and fall period. <br /> <br />A consulting team led by McLaughlin Water Engineers and Leo Eisel (now at Brown & <br />Caldwell) was selected to perform the study and put under contract in March 1999. The total study <br />cost was set at $395,000. The study was divided into two phases. An Executive Committee was <br />also formed to guide the study, help develop and analyZe alternatives, and distribute information <br />about the study. <br /> <br />. <br /> <br />Phase I looked at a wide range of possible alternat~Yes that were subjected to a preliminary <br />screening process in order to arrive at a short list of alternatives that would be intensively studied <br />in Phase II. Phase I was completed and the final report released in September 2000. <br /> <br />Funding for Phase II of the project was secured iand forwarded to the National Wildlife <br />Foundation along with a contract amendment on Octoher 13, 2000. Brown & Caldwell (B&C) <br />began Phase II modeling in November 2000. They p~esented their initial modeling results and <br />corresponding technical memorandum regarding altern~tive 1a.l to the Executive Committee on <br />December 21, 2000. After reviewing the modeling assUmptions and procedures and the technical <br />report, the Executive Committee made suggestions and revisions and established modeling and <br />reporting guidelines for evaluating all alternatives. ' <br /> <br />It was agreed that B & C would use CDSS, the C-l data set, and historical data for 1975 -1991 <br />for their analysis. Spring peak flows in the 1S-Mile Reach were within the recommended 12,900 efs <br />to 26,600 cfs during only six of the 17 years considered! B & C was asked to consider an additional <br />two years in which peak flows were slightly below 12,9PO cfs but could be enhanced to be above <br />12,900 cfs. Therefore, B & C investigated eight years d,uring which CFOPS might enhance the <br />spring peaks in the 1S-Mile Reach. <br /> <br />. <br /> <br />Flood Protection. Water Project Planning and Fl)umce . Stream and Lake Protection <br />Water Supply Protection. Conservation Planning <br />
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