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Zone 7 Water Agency Water Resources Engineering <br />100 North Canyons Parkway, Livermore, Ca 94551 <br />Tel. (925) 454-5000 Fax (925) 454-5727 <br />ORIGINATING SECTION: Water Resources Engineering <br />CONTACT: David Lunn <br />AGENDA DATE: May 16, 2007 <br />ITEM NO. <br />SUBJECT: ANNUAL REVIEW OF THE SUSTAINABLE WATER SUPPLY <br />SUMMARY: <br />Each year Zone 7 staff prepares a water supply assessment of the Livermore-Amador Valley <br />sustainable water supply. Every 5 years Zone 7 includes this information in an update of the <br />Urban Water Management Plan. This report updates the August 2006 information provided to <br />the Tri-Valley Water Retailers Group. The current sustainable supply is 87,500 acre-feet. <br />Operational studies used in this assessment demonstrate that Zone 7 has sufficient water supply <br />to meet future demands for every hydrologic year on record. Operational studies include <br />assessment of the recent final DWR allocation study published in June 2006. The capital <br />facilities needed to convey, recharge, store, treat, pump and deliver this water have been <br />identified and are incorporated into Zone 7's current 10-Year Capital Improvement Plan (CIP). <br />Zone 7 has sufficient sustainable supplies to provide for all potable (treated) water demands <br />through build-out of the cities current general plans and for all currently contracted non-potable <br />(untreated) water demands. <br />Following are the components of the Livermore-Amador Valley's sustainable water supply: <br />SOURCE ACRE-FEET/YEAR <br />State Water Project future average delivery 60,900 <br />Lake Del Valle future average yield 9,300 <br />Byron Bethany Irrigation District (BBID) 2,000 <br />Subtotal- Zone 7 Sustainable Supply 72,200 <br />Safe groundwater yield from Main Basin 13,400 <br />Recycled Water 1, 900 <br />Subtotal: Non-Zone 7 supply 15,300 <br />TOTAL SUSTAINABLE WATER SUPPLY 87,500 <br />