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ELAN PROJECT <br />WATER SUPPLY ASSESSMENT NOVEMBER 2, 2017 <br />further explain how OCWD successfully manages the OC Basin to meet these new groundwater <br />monitoring and management requirements. <br />OCWD manages the Basin through the Basin Production Percentage (BPP) which is determined <br />each water year. The BPP is set based on groundwater conditions, availability of imported water <br />supplies, water year precipitation, SAR runoff, and basin management objectives. The BPP <br />represents an established percentage identifying the amount of groundwater all pumpers in the <br />Basin can pump without paying a "pumping tax" or Basin Equity Assessment (BEA) to OCWD. <br />For example, if the BPP is set to 75%, all pumpers within the Basin, including the City, can supply <br />75% of their water needs from groundwater supplies at a cost significantly less than the cost of <br />imported water. If groundwater production is equal to or less than the BPP (i.e. less than 75% <br />in the example above), all producers within the Basin pay a replenishment assessment (RA) fee <br />which is used to fund groundwater replenishment and recharge programs aimed at ensuring <br />the long-term viability and stability of the Basin. If groundwater production is greater than the <br />established BPP for that water year (i.e. greater than 75% in the example above), the BEA is <br />determined for the producer of that amount of groundwater provided in excess of the BPP. The <br />BEA is an additional fee paid on each AF of water pumped above the BPP, making the total <br />cost of that additional water equal to the higher cost of imparted water from Metropolitan. <br />According to OCWD's Engineers Report for fiscal year 2015/16, the actual BPP was 75% as <br />shown in Table 6 below. Total water demands within OCWD were 367,402 AF for the water <br />year (July 1, 2015 to June 30, 2016). This is the lowest figure for total water demands since <br />1982 which was caused by the State of California's emergency drought regulations. <br />Groundwater production for the water year totaled 277,090 AF including any available In -Lieu <br />Program water and excluding Metropolitan Groundwater Storage Program extractions. A total <br />of 47,524 AF of supplemental water was used for the purpose of groundwater replenishment <br />and barrier maintenance. For the water year, the "annual overdraft" (annual basin storage <br />decrease without supplemental replenishment water) was 141,000 AF. The accumulated <br />overdraft decreased from 381,000 AF on June 30, 2015 to 379,000 AF on June 30, 2016. <br />Precipitation within the Basin was 62% of normal rainfall during the water year, totaling 8.40 <br />inches .6 The table below shows the water production data from 2015/16 for the City of Santa <br />Ana. <br />Table 6 0y al Santo Ana Groundwater Produdlon Data 2015.16 <br />Groundwatifr, . <br />5upplemeidal Watar (AF) ": <br />(/�.. <br />Attu cl. <br />Oroundwater <br />... . <br />PP . <br />Pnic(ueor <br />Non- Mt <br />Irrigation etropolitan Toal <br />Conservation Total <br />Delivery <br />Grand <br />Non- <br />Irrigation <br />CUP <br />Purnin <br />Credit <br />Total <br />Only <br />City of Santa <br />Ana <br />29,629 <br />4,524 <br />24,745 <br />8,183 <br />83 <br />8,266 <br />33,012 <br />75.0% <br />Source: OCWD 2015-16 Engineer's Report <br />Over the recent past, production capability of the Basin has increased as a result of increased <br />wastewater reclamation at the Groundwater Replenishment System (GWRS) located in Fountain <br />Valley. The GWRS, which is designed to turn wastewater into drinking water, is one of the most <br />6 OCWD. Engineer's Report, 2015/16, February 2017. <br />FusCOE ENGINEERING, INC. <br />15 <br />55A-122 <br />