55D - RESO FOR 4TH AND CARBILLO - Laserfiche WebLink

Home Browse Search

41" AND CABRILLO WATER SUPPLY ASSESSMENT AUGUST 21, 2020 successfully manages the OC Basin to meet these new groundwater monitoring and management requirements. OCWD manages the Basin through the Basin Production Percentage (BPP) which is determined each water year. The BPP is set based on groundwater conditions, availability of imported water supplies, water year precipitation, SAR runoff, and basin management objectives. The BPP represents an established percentage identifying the amount of groundwater all pumpers in the Basin can pump without paying a "pumping tax' or Basin Equity Assessment (BEA) to OCWD. For example, if the BPP is set to 75%, all pumpers within the Basin, including the City, can supply 75% of their water needs from groundwater supplies at a cost significantly less than the cost of imported water. If groundwater production is equal to or less than the BPP (i.e. less than 75% in the example above), all producers within the Basin pay a replenishment assessment (RA) fee which is used to fund groundwater replenishment and recharge programs aimed at ensuring the long-term viability and stability of the Basin. If groundwater production is greater than the established BPP for that water year (i.e. greater than 75% in the example above), the BEA is determined for the producer of that amount of groundwater provided in excess of the BPP. The BEA is an additional fee paid on each AF of water pumped above the BPP, making the total cost of that additional water equal to the higher cost of imported water from Metropolitan. According to OCWD's Engineer's Report for fiscal year 2017/18, the actual BPP was 75% as shown in Table 5 below. Total water demands within OCWD were 419,477 AF for the water year (July 1, 2017 to June 30, 2018). Groundwater production for the water year totaled 310,025 AF including any available In -Lieu Program water and excluding Metropolitan Groundwater Storage Program extractions. Groundwater stored in the basin increased by 51,000 AF. For the water year, the "annual overdraft" (annual basin storage decrease without supplemental replenishment water) was 195,000 AF. The accumulated overdraft was 277,000 AF on June 30, 2018. .5 The table below shows the water production data from 2017/18 for the City of Santa Ana. Table 5 City of Santa Ana Groundwater Production Data 207 7-18 Groundwater Supplemental Wafer (AF) (AF) Actual Groundwater BPP Producer Non- Metropolitan Conservation Grand Non- Total Iumation CUP Delivery Credit Total Total Irrigation P Only City of Santa 21,327 4,378 25,705 9,265 83 9,348 35,054 73.3% Ana Source: OCWD 2017-18 Engineer's Report Over the recent past, production capability of the Basin has increased as a result of increased wastewater reclamation at the Groundwater Replenishment System (GWRS) located in Fountain Valley. The GWRS, which is designed to turn wastewater into drinking water, is one of the most technologically advanced wastewater treatment plants in the world. A treatment plant expansion of 30 million gallons per day was recently put on line by OCWD increasing the recharge capacity of the GWRS to 100 million gallons per day. This equates to the recycling of over 110,000 AFY of wastewater back into the Basin for future extraction and potable use. A final 5 OCWD. Engineer's Report, 2017/18, April 2019. EUSCOE ENGINEERING, INC. 55D-23 15