Revised Draft Antelope Valley Watermaster 2018 Annual Report
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Revised Draft Antelope Valley Watermaster 2018 Annual Report July 8, 2019 Watermaster Engineer REVISED DRAFT Antelope Valley Watermaster 2018 Annual Report July 8, 2019 2490 Mariner Square Loop, Suite 215 Alameda, CA 94501 510.747.6920 www.toddgroundwater.com Third Annual Report, Calendar Year 2018 Antelope Valley Groundwater Cases, Judicial Council Coordination Proceeding No. 4408, Santa Clara Case No.: 1-05-CV-049053, Superior Court of the State of California, County of Los Angeles - Central District Antelope Valley Watermaster Board of Directors The Antelope Valley Watermaster is charged with administering adjudicated water rights and managing groundwater resources within the Adjudication Area of the Antelope Valley. The five-member Board includes: Robert Parris, Chairperson Dennis Atkinson, Vice Chairperson Adam Ariki John Calandri Leo Thibault Antelope Valley Watermaster Engineer 2490 Mariner Square Loop, Suite 215 Alameda, CA 94501 510.747.6920 www.toddgroundwater.com Table of Contents Message from the Watermaster Board ...................................................................................... i 1 Introduction ...................................................................................................................... 1 1.1 Background ............................................................................................................. 1 1.2 Purpose and Scope ................................................................................................. 3 1.3 Report Organization ............................................................................................... 4 1.4 Stakeholder and Public Review and Comment ...................................................... 8 1.5 Antelope Valley Adjudication Management .......................................................... 9 1.5.1 Watermaster Board ........................................................................................ 10 1.5.2 Watermaster Engineer ................................................................................... 11 1.5.3 Watermaster Legal Counsel ........................................................................... 12 1.5.4 Administrative Staff and Functions ................................................................ 12 1.5.5 Advisory Committee ....................................................................................... 13 1.5.6 Subarea Advisory Management Committees................................................. 13 1.5.7 Rules and Regulations Development.............................................................. 13 1.6 Watermaster Finances ......................................................................................... 15 1.6.1 Watermaster Administrative Budgets ............................................................ 15 1.6.2 Replacement Water Assessments .................................................................. 16 2 Watermaster Activities in 2018 ...................................................................................... 18 3 Monitoring of Safe Yield Components ............................................................................ 21 3.1 Groundwater Basin and Adjudication Area .......................................................... 21 3.2 Safe Yield Determination in the Judgment........................................................... 22 3.2.1 Natural Groundwater Recharge ..................................................................... 23 3.2.2 Native Safe Yield ............................................................................................. 25 3.2.3 Total Safe Yield ............................................................................................... 26 3.3 Climate Data ......................................................................................................... 27 3.4 Streamflow Data ................................................................................................... 29 3.5 Groundwater Levels ............................................................................................. 31 3.5.1 Hydrograph Development and Analysis ......................................................... 32 3.5.2 Groundwater Elevation Contour Maps .......................................................... 33 Revised Draft 2018 Annual Report TODD GROUNDWATER Antelope Valley Watermaster i Watermaster Engineer 3.5.3 Change in Groundwater in Storage ................................................................ 37 3.6 Subsidence Monitoring ........................................................................................ 39 3.7 Groundwater Quality............................................................................................ 40 3.8 Surface Water Quality .......................................................................................... 40 3.9 Groundwater Production Monitoring and Meter Installation ............................. 41 3.9.1 Production Monitoring and Metering ............................................................ 42 3.9.2 Small Pumper Class Production Monitoring ................................................... 43 3.9.3 2018 Land Use Monitoring ............................................................................. 43 4 Water Accounting ........................................................................................................... 45 4.1 Production Right and Production Categories ....................................................... 45 4.2 Rampdown Schedule ............................................................................................ 45 4.3 2018 Reported Production and Water Accounting .............................................. 46 4.4 Imported Water Use and Return Flows ............................................................... 49 4.5 Carry Over Water ................................................................................................. 49 4.6 Replacement Obligations ..................................................................................... 50 4.7 Transfers ............................................................................................................... 50 4.8 Stored Water and Storage Agreements ............................................................... 51 4.9 Drought Program .................................................................................................. 53 4.10 Changes in Use ..................................................................................................... 54 4.11 Well Applications for New or Replacement Production Wells............................. 55 4.12 Wastewater and Recycled Water ......................................................................... 56 5 References ...................................................................................................................... 57 List of Tables Table 1. Minimum Required Elements for the 2018 Annual Report .................................. 4 Table 2. Description of Appendices .................................................................................... 5 Table 3. Rules and Regulations – Sections and Status ...................................................... 14 Table 4. Precipitation and Evapotranspiration Stations ................................................... 28 Table 5. Streamflow Gaging Stations ................................................................................ 30 Table 6. Water Level Data by Source ................................................................................ 34 Table 7. Change in Groundwater in Storage for Management Subareas ......................... 38 Revised Draft 2018 Annual Report TODD GROUNDWATER Antelope Valley Watermaster ii Watermaster Engineer Table 8. Historical Change in Groundwater in Storage ..................................................... 38 Table 9. 2016 to 2018 Estimated Agricultural Acreage in the Antelope Valley ................ 44 Table 10. 2018 Production Reported by Party .................................................................... 46 Table 11. Status of Production Reporting for 2016 and 2017 ............................................ 47 Table 12. District No. 40 Water Demand and Imported Water Supply .............................. 53 Table 13. Drought Program Participants Production in Excess of Rights ........................... 54 List of Figures (following text) Figure 1 Antelope Valley Adjudication Area and Management Subareas Figure 2 Adjudication Production Categories Figure 3 Schematic Diagram Natural Groundwater Recharge Components Figure 4 Conceptual Diagram of Safe Yield Components Figure 5 Precipitation and Streamgage Stations Figure 6 Antelope Valley Precipitation 2018 Figure 7 USGS Water Level Monitoring Network Figure 8 Wells Monitored in March 2018 or March 2019 by Data Source Figure 9 Groundwater Elevations Spring 2018 Figure 10 Groundwater Elevations Spring 2019 Figure 11 Groundwater Elevation Changes Spring 2018 to Spring 2019 Figure 12 Historical Land Subsidence and Monitoring Network Figure 13 Water Supply Wells and Public Water Systems Figure 14 Small Pumper Location Map Figure 15 2018 Land Use Figure 16 Approved Well Applications 2017 and 2018 Revised Draft 2018 Annual Report TODD GROUNDWATER Antelope Valley Watermaster iii Watermaster Engineer Appendices Appendix A: Rampdown Tables Appendix B: Water Accounting Tables Appendix C: Imported Water Tables Appendix D: Imported Water Return Flows Appendix E: Replacement Obligations, 2018 Appendix