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Overview -- Groundwater Management in California Western States Water Council April 2004.

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Presentation on theme: "Overview -- Groundwater Management in California Western States Water Council April 2004."— Presentation transcript:

1 Overview -- Groundwater Management in California Western States Water Council April 2004

2 GW resources background Supports about 30% of California urban & ag needs in average water years Important drought resource Supplies majority of state’s public water systems (largest urban agencies use surface water, almost all small systems use groundwater)

3 Rights to use of groundwater Not administered by State (unlike surface water) Developed through case law

4 Case law examples City of Los Angeles v. City of San Fernando (1975) – mutual prescription not applicable between public agencies Niles Sand & Gravel Co. v. Alameda County Water District (1974) – public agencies can store water underground & recover stored water

5 Impetus for GW management Seawater intrusion – widespread by 1950s Overdraft, land subsidence Fear of exports State financial assistance Other

6 Physical realities of GW management Limit/regulate extraction Develop new in-basin surface supply Bring in new imported water source Storage/conjunctive use projects require available aquifer capacity, conveyance, and surface water source

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9 GW management techniques Basin adjudication in court (19) Special or general act districts AB 3030 plans (>160 agencies) County ordinances (28)

10 Basin adjudications Expensive Entail years in court system

11 AB 3030 plans Enabling legislation enacted in 1992 Plan adoption is voluntary Hydrologic/hydrogeologic/political boundaries often differ Plans may be multi-agency Are they effective?

12 GW storage projects increasing Existing “large” projects w/ ballpark of 10 MAF total managed capacity More than $500M in state financial assistance authorized Many “small” and “medium” projects now in planning stages, reflecting availability of substantial state funding

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