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Last modified
8/16/2009 2:43:45 PM
Creation date
2/20/2007 11:04:28 AM
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Board Meetings
Board Meeting Date
11/13/2006
Description
CWCB Director's Report
Board Meetings - Doc Type
Memo
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<br />. <br /> <br />Long Term Augmentation Study: The subgroup looking at long-term augmentation options met in Las <br />Vegas on October 20. This was the 1 SI subgroup meeting since the contractor for the project was selected. <br />The subgroup reviewed results of the interviews conducted with each of the seven basin states and <br />Reclamation. White papers were prepared for each augmentation option by the consultant. The options <br />were discussed and identified as either "long-term augmentation," or "water conservation and water <br />system efficiency improvements" that would supply short-term augmentation or long-term benefits to the <br />system. The options were put into categories for further investigation. <br /> <br />Mexican Treaty and Shortage Subgroup: The 7-State Mexican Treaty subgroup met on October 24 in <br />Phoenix to discuss issues associated with the Mexican Treaty. The goal of this subgroup is to develop a <br />defenseable position on when and how deliveries to Mexico can be shorted. Tom McCann, Central <br />Arizona Project, is chairing this subgroup. To date the group has been composed largely of Arizona and <br />California interests, with little representation from other interests. The work of this subgroup will be <br />presented to the principles at appropriate times. <br /> <br />Upper Colorado River Basin Hydrologic Conditions and Glen Canyon Operations: Releases from <br />Glen Canyon Dam in November 2006 will average 10,000 cubic feet per second (cfs) with a total of <br />600,000 acre-feet scheduled to be released for the month. Daily release fluctuations due to load following <br />will vary between a low 00,000 cfs (during late evening and early morning off-peak hours) to a high of <br />13,000 cfs (during daylight and early evening on-peak hours). In December 2006, scheduled releases will <br />be increased to 800,000 acre-feet. <br /> <br />. <br /> <br />During October 2006, the "Four Comers" region experienced extraordinary amounts of precipitation. <br />Record-breaking daily flows for the month of October were observed on the San Juan, Dolores, San <br />Rafael, FremontJDirty Devil, Escalante, and Pari a Rivers in the first half of October. The most <br />exceptional of these high flows were the flood flows on the Fremont/Dirty Devil on October 6 and 7, <br />2006. The water level stage of the "Dirty Devil above Poison Springs Wash near Hanksville, Utah" <br />increased by more than 15 feet during the flood event. The high inflows downstream of Glen Canyon <br />Dam also brought very large amounts of sediment into the Colorado River providing an opportunity to <br />make releases from Glen Canyon Dam in excess of power plant capacity (BHBF) for beach habitat <br />building purposes. BHBF operations will be discussed at the Glen Canyon Adaptive Management <br />Technical Workgroup meeting on November 8-9. <br /> <br />Unregulated inflow to Lake Powell in water year 2006 (which ended on September 30,2006) was 8.77 <br />million acre-feet, 73 percent of average. Unregulated inflow in October 2006 was 1,018,000 acre-feet or <br />184 percent of average. Lake Powell rarely increases in storage during the month of October. However, <br />in October 2006, Lake Powell increased in storage by 609,000 acre-feet, gaining 6.2 feet in elevation. <br />The elevation of Lake Powell on November 1,2006 was 3,608.0 feet with reservoir storage currently at <br />12.53 million acre-feet, 52 percent of capacity. <br /> <br />The Upper Colorado River Basin has experienced five consecutive years of extreme drought from <br />September 1999 through September 2004. In the summer of 1999, Lake Powell was essentially full with <br />reservoir storage at 97 percent of capacity. Inflow volumes for the five consecutive water years following <br />were significantly below average with total unregulated inflows in water years 2000, 2001, 2002, 2003, <br />and 2004 respectively at 62, 59, 25, 51, and 49 percent of average. Lake Powell storage decreased <br />through this five-year period, reaching a low of 8.0 million acre-feet (33 percent of capacity) on April 8, <br />2005. Hydrologic conditions improved in water year 2005 and Lake Powell storage increased by 2.77 <br />million acre-feet (31 feet in elevation) during water year 2005 with an unregulated inflow of 105 percent <br />of average. <br /> <br />. <br /> <br />In 2006, there was a return to drier condition in the Colorado River Basin and unregulated inflow to Lake <br />Powell in water year 2006 was 73 percent of average. <br /> <br />21 <br />
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