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Groundwater Production Current Water Year: For the first six months of the current WY (October 2011 through March 2012), production was 112,069 AF (89,448 AF in the CB and 22,621 AF in the WCB). This is 7,939 AF (7.6%) more than the same time period the previous year. Taking this trend into account and the fact that this year is currently a dry year which could result in increased water use, and the potential lack of an In-Lieu program, it is estimated that the pumping in the CBWCB will be 243,500 AF in the current year (199,000 AF in the CB and 44,500 AF in the WCB). Ensuing Water Year: To estimate production for the ensuing year, recent averages are used in addition to knowledge of changing conditions that might affect pumping. Actual pumping patterns can vary considerably throughout the year based on a pumper’s individual operational needs, water demands, conservation efforts and hydrology. To estimate the ensuing year’s groundwater pumping, WRD used the three-year average of actual pumping. For the CB, WYs 2007/2008 – 2009/2010 were used. The most recent year 2010/2011 was not used since pumping was anomalously low due to the In-Lieu program with the City of Long Beach. In addition, in 2007/2008 the City of Long Beach pumped extra water that was previously put in storage, so that extra pumping was excluded from the averaging. Therefore, the three year average for CB pumping is 200,000 AF. For the WCB, WYs 2008/2009 – 2010/2011 were used to produce an average of 44,500 AF. Both basins combined equal 244,500 AF as the ensuing year pumping estimate. Table 1 shows the groundwater production amounts for the previous, current, and ensuing water years. Measurement of Production With few exceptions, meters installed and maintained by the individual producers measure the groundwater production from their wells. Through periodic testing, DWR as Watermaster verifies the accuracy of individual meters and orders corrective measures when necessary. The production of the few wells that are not metered is estimated on the basis of electrical energy consumed by individual pump motors, duty of water, or other reasonable means. Carryover and Drought Provisions The "carryover" of unused rights influences the actual amount of production for any given year. The "carryover" for any single year is 20% of the allotted pumping right in both the Central and West Coast Basins. This provision of the Judgments extends the flexibility with which the pumpers can operate. Conversely, the use of rights beyond the annual allotted quantity affects the annual production amount in the opposite manner. During emergency or drought conditions, WRD can allow under certain conditions an additional 27,000 AF of extractions for a four-month period (17,000 for CB and 10,000 for WCB). This provision has yet to be exercised but offers the potential use of an additional 7.8% pumping in the CB and 15% in the WCB. The Central Basin Judgment also contains an additional Drought Carryover provision available to all Central Basin water rights holders after a declaration of a Water Emergency by the WRD Board of Directors. The Drought Carryover allows water rights holders to carryover an additional 35% of WRD Engineering Survey and Report, 2012 II-2
Groundwater Production their APA (or 35 AF, whichever is larger) beyond the annual 20% described above during the period that the Declared Water Emergency is in effect. The intent of the action is prevent further degradation of the groundwater basins by helping to restore groundwater levels and improving the water supply in the aquifers by providing an incentive to groundwater producers in the Central Basin to reduce pumping for a particular period of time. A Declared Water Emergency is defined in the Judgment as: "A period commencing with the adoption of a resolution of the Board of Directors of the Central and West Basin Water Replenishment District declaring that conditions within the Central Basin relating to natural and imported supplies of water are such that, without implementation of the water emergency provisions of this Judgment, the water resources of the Central Basin risk degradation. In making such declaration, the Board of Directors shall consider any information and requests provided by water producers, purveyors and other affected entities and may, for that purpose, hold a public hearing in advance of such declaration. A Declared Water Emergency shall extend for one (1) year following such resolution, unless sooner ended by similar resolution.” WRD Engineering Survey and Report, 2012 II-3
Page 2 and 3: Water Replenishment District Of Sou
Page 4 and 5: taking advantage of surplus purchas
Page 6 and 7: TABLE OF CONTENTS (Continued) CHAPT
Page 8 and 9: GLOSSARY OF ACRONYMS ABP AF AFY APA
Page 10 and 11: BOARD SUMMARY Board Summary Distric
Page 12 and 13: Board Summary Using currently avail
Page 14 and 15: Introduction 4) The Board by resolu
Page 18 and 19: CHAPTER III GROUNDWATER CONDITIONS
Page 20 and 21: Groundwater Conditions In connectio
Page 22 and 23: Groundwater Conditions Well 3S/12W
Page 24 and 25: Groundwater Conditions After consid
Page 26 and 27: Groundwater Replenishment Recommend
Page 28 and 29: Groundwater Replenishment September
Page 30 and 31: CHAPTER V PROJECTS AND PROGRAMS Pro
Page 32 and 33: Projects and Programs the recharge
Page 34 and 35: Projects and Programs The Groundwat
Page 36 and 37: Projects and Programs purposes; and
Page 38 and 39: Projects and Programs contamination
Page 40 and 41: Projects and Programs recycled wate
Page 42 and 43: Projects and Programs developed thr
Page 44 and 45: Table 1 GROUNDWATER CONDITIONS AND
Page 46 and 47: Table 3 WRD PROJECTS AND PROGRAMS P
Page 48 and 49: Water Year Inches Table 5 HISTORICA
Page 50 and 51: Table 7 ACCUMULATED OVERDRAFT CALCU
Page 52 and 53: Table 9 QUANTITY OF WATER REQUIRED
Page 54 and 55: HISTORICAL AMOUNTS OF WATER PURCHAS
Page 56 and 57: HISTORICAL AMOUNTS OF REPLENISHMENT
Page 58 and 59: WATER YEAR HISTORICAL AMOUNTS OF WA
Page 60 and 61: FIGURES
Page 62 and 63: 240 220 200 180 160 140 120 100 80
Page 64 and 65: 120 100 80 60 40 20 0 -20 -40 -60 -
Page 66 and 67:
PLATES
Page 68 and 69:
ROSEMEAD WEST COVINA SOUTH EL MONTE
Page 70:
Water Replenishment District of Sou
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