Groundwater Assessment Study for the Metropolitan Water District of Southern California
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Groundwater Assessment Study for the Metropolitan Water District of Southern California Southern California Water Dialogue Southern California Water Dialogue May 2008 May 2008
description
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 - PowerPoint PPT Presentation
Transcript of Groundwater Assessment Study for the Metropolitan Water District of Southern California
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 DialogueSouthern California Water Dialogue
May 2008May 2008
Service Area Water SuppliesService 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
OverviewOverview
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
Report ContentReport 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
Regional Overview FindingsRegional 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
Regional Overview FindingsRegional 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
Adjudicated
Un-adjudicated
Management Statute / Adopted Plan
Groundwater Basin Groundwater Basin Governance in 2006Governance in 2006
Northwest MWD Service Area Basins
San Fernando Valley Basins
LA County Coastal Plain Basins
San Gabriel Valley Basins
Orange County Basins
Inland Empire Basins
Eastside MWD Service Area Basins
San Diego County Basins
Trends in Production
(Acre-Feet)
151,844
89,834
240,663
296,845
275,370
163,854
181,085
51,321
122,206
109,071
247,732
319,959
318,477
180,732
213,355
52,531
1985-’94 1995-’04
Northwest MWD Service Area Basins
San Fernando Valley Basins
LA County Coastal Plain Basins
San Gabriel Valley Basins
Orange County Basins
Inland Empire Basins
Eastside MWD Service Area Basins
San Diego County Basins
Trends in Recharge(Acre-Feet)
104,550
64,658
218,945
311,536
284,672
14,212
24,148
--
70,050
74,198
223,217
438,168
258,556
30,060
24,632
--
1992-’93 2004-’05
Comparison of Production and Recharge Trends
Comparison of Production and Recharge Trends
Time period
Average Annual Production (AF)
Average annual recharge (AF)
Production supported by recharge
1985-1994 1,450,817 759,578 52%
1995-2004 1,564,062 741,633 47%
Trends in Recharge MixTrends in Recharge Mix
Average 1985/86 to 1994/95 Average 1995/96 to 2004/05
SpreadingSpreadingRunoff 63%Runoff 63%
InjectionInjectionImported 3%Imported 3% InjectionInjection
Recycled 2%Recycled 2%
In-lieuIn-lieu10%10%
SpreadingSpreadingImportedImported
16%16%
SpreadingSpreadingRecycled 6%Recycled 6%
SpreadingSpreadingRunoff 56%Runoff 56%
InjectionInjectionImported 4%Imported 4%
InjectionInjectionRecycled 1%Recycled 1%
In-lieuIn-lieu11%11%
SpreadingSpreadingImportedImported
21%21%
SpreadingSpreadingRecycled 7%Recycled 7%
Regional Overview FindingsRegional 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
Northwest MWD Service Area Basins
San Fernando Valley Basins
LA County Coastal Plain Basins
San Gabriel Valley Basins
Orange County Basins
Inland Empire Basins
Eastside MWD Service Area Basins
San Diego County Basins
Available Basin Available Basin Storage Space Storage Space (AF)(AF)
945,000
505,000
450,000
245,000
135,000
439,000
500,000
19,000
Approved ProjectsApproved Projects1.1. N. Las Posas (Phases 1&2)N. Las Posas (Phases 1&2)2.2. Long BeachLong Beach3.3. Foothill MWDFoothill MWD4.4. TVMWD / La VerneTVMWD / La Verne5.5. Chino BasinChino Basin6.6. Orange County BasinOrange County Basin7.7. ComptonCompton8.8. Long Beach - LakewoodLong Beach - Lakewood9.9. Upper Claremont Heights – TVMWDUpper Claremont Heights – TVMWD10.10. ElsinoreElsinore
In-Basin Groundwater Storage ProjectsIn-Basin Groundwater Storage Projects
Identified ProjectsIdentified Projects11.11. Raymond Basin - PasadenaRaymond Basin - Pasadena12.12. N. Las Posas (Phase 3)N. Las Posas (Phase 3)
11 33
7722
44
55
66
11111212
88
99
1010
Issues for StorageIssues 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
Groundwater WorkshopsGroundwater 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
