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Groundwater Assessment Study for the Metropolitan Water District of Southern California

Groundwater Assessment Study for the Metropolitan Water District of Southern California. Southern California Water Dialogue May 2008. Service Area Water Supplies. Four million AF of total average annual retail demand

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Groundwater Assessment Study for the Metropolitan Water District of Southern California

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  1. Groundwater Assessment Study for theMetropolitan Water District of Southern California Southern California Water Dialogue May 2008

  2. Service Area Water Supplies • Four million AF of total average annual retail demand • Local groundwater production supplies 37% of the total average annual retail demand in Metropolitan’s service area

  3. Overview • Metropolitan Board requested study in Fall 2005 • Collaborative effort with member agencies and groundwater basin managers • Technical and factual baseline using existing data • Reviews period 1985 through 2004

  4. Report Content • Regional overview and groundwater basin reports • Physical characteristics of each basin, and management, facilities and operations • Regional trends in management, facilities, production, recharge, water levels • Assessment of storage space available

  5. Regional Overview Findings • On average, over 1.5 million AF produced annually from groundwater basins • 0.75 million AF actively recharged each year • Recharge utilizes storm runoff, recycled water, and imported water

  6. Regional Overview Findings • In 2004/05 capital facility investments include: • More than 4,300 active production wells • 36 ASR wells • 5,000 acres of spreading basins • 7 seawater intrusion barriers • 16 desalters • 400 acres of water quality wetlands

  7. Groundwater Basin Governance in 2006 Adjudicated Un-adjudicated Management Statute / Adopted Plan

  8. Trends in Production (Acre-Feet) 1985-’94 1995-’04 Northwest MWD Service Area Basins 151,844 122,206 San Fernando Valley Basins 89,834 109,071 LA County Coastal Plain Basins 240,663 247,732 San Gabriel Valley Basins 296,845 319,959 Orange County Basins 275,370 318,477 Inland Empire Basins 163,854 180,732 Eastside MWD Service Area Basins 181,085 213,355 San Diego County Basins 51,321 52,531

  9. Trends in Recharge (Acre-Feet) 1992-’93 2004-’05 Northwest MWD Service Area Basins 104,550 70,050 San Fernando Valley Basins 64,658 74,198 LA County Coastal Plain Basins 218,945 223,217 San Gabriel Valley Basins 311,536 438,168 Orange County Basins 284,672 258,556 Inland Empire Basins 14,212 30,060 Eastside MWD Service Area Basins 24,148 24,632 San Diego County Basins -- --

  10. Comparison of Production and Recharge Trends

  11. Trends in Recharge Mix Average 1985/86 to 1994/95 Average 1995/96 to 2004/05 InjectionImported 4% InjectionImported 3% InjectionRecycled 1% InjectionRecycled 2% In-lieu 11% In-lieu 10% SpreadingImported21% SpreadingImported16% SpreadingRunoff 56% SpreadingRunoff 63% SpreadingRecycled 6% SpreadingRecycled 7%

  12. Regional Overview Findings • In 2004/05, active recharge utilized 60% of the reported available capacity • In 2004/05, 21% of production was reported as treated or blended for water quality purposes • 3.2 million AF of basin capacity is available for storage subject to resolution of issues and determinations of institutional, operational and economic feasibility

  13. Available Basin Storage Space (AF) NorthwestMWD Service Area Basins 945,000 San Fernando Valley Basins 505,000 LA County Coastal Plain Basins 450,000 San Gabriel Valley Basins 245,000 Orange County Basins 135,000 Inland Empire Basins 439,000 Eastside MWD Service Area Basins 500,000 San Diego County Basins 19,000

  14. In-Basin Groundwater Storage Projects 12 1 3 11 9 4 5 Approved Projects N. Las Posas (Phases 1&2) Long Beach Foothill MWD TVMWD / La Verne Chino Basin Orange County Basin Compton Long Beach - Lakewood Upper Claremont Heights – TVMWD Elsinore 7 2 8 10 6 Identified Projects Raymond Basin - Pasadena N. Las Posas (Phase 3)

  15. Issues for Storage • Need for funding • Water quality treatment • Capital infrastructure • Mismatch of storage with overlying demand • Resolution of institutional disagreements • Regulatory issues • Availability of surplus water to store

  16. Groundwater Workshops • Objective: Develop recommendations to encourage growth in groundwater storage and conjunctive use • Purpose: Provide input to Metropolitan’s IRP Update • Participants: Metropolitan member agencies and groundwater basin managers • Timing: Spring/Summer 2008

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