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RES 07163
City of Pleasanton
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RES 07163
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6/15/2009 1:03:17 PM
Creation date
12/31/2007 1:57:28 PM
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CITY CLERK
CITY CLERK - TYPE
RESOLUTIONS
DOCUMENT DATE
12/18/2007
DESTRUCT DATE
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DOCUMENT NO
RES 07163
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BACKGROUND: <br />Following the most recent multi -year drought (1987 -92), the Zone 7 Board requested an annual <br />report of the Sustainable Water Supply. Typically each April since 1992, the Zone staff has <br />reviewed the Livermore Valley's long -term "sustainable water supply" and has prepared a <br />summary report. Since the last drought, Zone 7 has purchased additional long -term water <br />supplies from the State Water Project (SWP). Zone 7's maximum annual contract amount, now <br />referred to as our "Table A Contract Amount has increased from 46,000 to 80,619 acre-feet. <br />(Note that the Table A contract amount was previously referred to as SWP maximum annual <br />"entitlement" or MAE, but due to potential confusion over the use of the word "entitlement the <br />SWP will no longer use that term.) With these new purchases, Zone 7 has sufficient sustainable <br />water supplies to provide for all potable water demands through buildout and for all currently <br />contracted non potable (untreated) water demands. <br />The scope of the analysis has expanded over the years and has adapted to incorporate changes in <br />State Water Project operations and new Zone 7 facilities. In 2002, staff incorporated multi -year <br />operations modeling and salt balance calculation into our review. This modeling includes an <br />evaluation of all past hydrologic events from the past 80 years and includes the worst single -year <br />drought of record (1977) and the two worst multi -year droughts of record (1928 -34 and 1987- <br />92). In 2004, staff expanded the multi -year modeling to incorporate the new version of the DWR <br />CALSIM II that included coordinated operation of State and Federal operations and included the <br />Environmental Water Account. In 2004 the CALSIMII 2021B version was considered the most <br />effective study for future conditions. <br />In September 2005, Zone 7 updated the Urban Water Management Plan and based it on the most <br />recent data available at that time. DWR had not finalized the "SWP Delivery Reliability Report" <br />and only a draft report (June 2005) was available. At that time Zone 7 utilized "Study Number 7" <br />in the draft report as the most appropriate data source for future SWP delivery. In August 2005, <br />Zone 7 prepared an updated Sustainable Water Supply report to document the data used in the <br />2005 UWMP update. In August 2005, Zone 7 had sufficient storage to maintain a sustainable <br />water supply and meet full deliveries through about 2014 without pumping the local <br />groundwater basin storage below historic lows. In 2006 Zone 7 purchased additional <br />groundwater storage capacity in the Cawelo Water Storage District Banking Program and made <br />the first deliveries of water into storage. With the recent addition of Cawelo Water Storage <br />District, Zone has sustainable water supplies to meet all potable and non potable demands <br />through buildout. <br />In June 2006 DWR published "The State Water Project Delivery Reliability Report 2006" <br />(ht tp: bavdeltaoffice .water.ca.gov /SWPRe105 final .pdf) In the summer of 2006, <br />Zone 7 approved the purchase of storage and pump back capacity in Cawelo Water Storage <br />District and transferred 10,000 acre-feet of water to Cawelo for long term drought reliability. <br />This updated analysis includes the most recent studies from the State reliability report and <br />includes the Cawelo Banking program. <br />2 <br />
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