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2015 URBAN WATER MANAGEMENT PLAN <br />3.3.5 Metropolitan Conjunctive Use Program <br />Since 2004, OCWD and certain groundwater producers have participated in Metropolitan's Conjunctive <br />Use Program (CUP). This program allows for the storage of Metropolitan water in the OC Basin. The <br />existing Metropolitan program provides storage up to 66,000 AF of water in the OC Basin in exchange for <br />Metropolitan's contribution to improvements in basin management facilities. These improvements include <br />eight new groundwater production wells, improvements to the seawater intrusion barrier, and construction <br />of the Diemer Bypass Pipeline. The water is accounted for via the CUP program administered by the <br />wholesale agencies and is controlled by Metropolitan such that it can be withdrawn over a three -year time <br />period (OCWD, 2013 -2014 Engineer's Report, February 2015). <br />3.3.6 Groundwater Historical Extraction <br />The City pumps groundwater through its twenty operating groundwater wells. A summary of the <br />groundwater volume pumped by the City is shown in Table 3 -2. <br />Table 3.2: Groundwater volume Pumped (AP) <br />3.3.7 Overdraft Conditions <br />Annual groundwater basin overdraft, as defined in OCWD's Act, is the quantity by which production of <br />groundwater supplies exceeds natural replenishment of groundwater supplies during a water year. This <br />difference between extraction and replenishment can be estimated by determining the change in volume <br />of groundwater in storage that would have occurred had supplemental water not been used for any <br />groundwater recharge purpose, including seawater intrusion protection, advanced water reclamation, and <br />the in -Lieu Program. <br />The annual analysis of basin storage change and accumulated overdraft for water year 2013 -14 has been <br />completed. Based on the three -layer methodology, an accumulated overdraft of 342,000 AF was <br />calculated for the water year ending June 30, 2014. The accumulated overdraft for the water year ending <br />June 30, 2013 was 242,000 AF, which was also calculated using the three -layer storage method. <br />Therefore, an annual decrease of 100,000 AF in stored groundwater was calculated as the difference <br />between the June 2013 and June 2014 accumulated overdrafts (OCWD, 2013 -2014 Engineer's Report, <br />February 2015). <br />75E -47 <br />arcadis.com 3 -13 <br />