The Role of Groundwaterin Effective Water Management Sonoma Valley Basin Advisory PanelMay 31, 2007John WoodlingCA Department of Water Resources

OverviewWhat is Conjunctive Use?The States Role in Groundwater ManagementData ProgramsPartnershipsGrantsExamplesAmerican RiverKern CountyOrange CountyClimate Change

Groundwater is Part of the Hydrologic Cycle

California Water Plan

Additional Water from Management Strategies

Conjunctive Water ManagementCoordinated use of surface and groundwater to increase water supply and improve reliability.GWSWCM

Elements of Conjunctive Use

Surface Water Source Imported waterLocal runoffTreated wastewaterConveyance

Recovery and UseExtraction and direct usePump back to conveyanceSurface water exchange TreatmentConveyance

Recharge Method Direct spreadingInjectionIn-lieu rechargeInduced natural recharge

InstitutionsLaws, Regulations, OrdinancesContracts and AgreementsPolitical SupportFinancing/Economics

Capacity BuildingGW ManagementProject ConstructionThe States RoleDATA PROGRAMS

DWR Bulletin 118 Defined 520 basins in California Hydrologic, physical, and political boundaries GW also occurs in non-alluvial settingshttp://www.groundwater.water.ca.gov/bulletin118/index.cfm

Water Data Library Map based interface for groundwater level data

Local Partnerships Technical assistance Facilitation Stakeholder driven planning Local development of projects

$27 million in grants over five fiscal years 128 studies and projectsMonitoring wells, sampling and analysisGroundwater modelingAquifer testing and pilot studiesWell destructionGroundwater storage feasibility studiesManagement plan development

Local Groundwater Assistance Grants

Construction GrantsProposition 13 provided over $250 million for construction of conjunctive use facilitiesFunded 63 projectsYield of over 300,000 acre-feet of water annuallyTotal project costs over $1 billion through local cost shareProposition 50 provides $500 million for multiple project categories

Proposition 84$1 Billion for IRWM grants$3-4 billion local cost share expectedRegional allocationsProjected 1.2 million acre-feet of water supply$37$73$57$138$36$27$52$60$114$91$215$ in millionsassist local public agencies to meet long term water needs of the state including the delivery of safe drinking water and the protection of water quality and the environment.

Case StudiesAmerican River Basin

Orange County

Kern County

American River Basin Regional Conjunctive Use ProgramFolsom ReservoirGroundwater BasinAmerican RiverSacramento River

Water Purveyors in the American River Basin

Conjunctive Use Program ConceptsIn-lieu recharge alternatives centered around American and Sacramento River treatment plants, limited ASR Conveyance to move surface water to traditional groundwater users in wet yearsExtraction capability for traditional surface water users shift to groundwater in dry yearsIntegrated operation of Folsom Lake and the groundwater basin.

Institutional ControlsSacramento Water Forum AgreementSacramento Groundwater Authority (SGA)JPA of Cities of Sacramento, Citrus Heights and Folsom, and County of Sacramento. Representation delegated to water purveyor boardsEnsure equitable disbursement of costs and benefitsResponsible for monitoring and reporting in basin

Orange County Water District

Orange County Groundwater Replenishment System

Major Partners OCWD OC Sanitation District Project Benefits Provides 72 TAF supply Reduces dependence on imported water Utilizes investments in existing recharge, pumping and distribution facilities Postpones need for new ocean outfall for wastewater Enhances GW basin protection from seawater intrusion Reduces effluent loading to ocean

Kern County Groundwater Banking

San Joaquin Valley Banking Projects Location Map

Kern County

Delano-Earlimart ID

Rag Gulch WD

Kern-Tulare WD

Southern San Joaquin MUD

North Kern WSD

Cawelo WD

Shafter-Wasco ID

Rosedale-Rio Bravo WSD

KCWA Improvement District No. 4

Olcese WD

Arvin-Edison WSD

Tehachapi-Cummings CWD

Tejon-Castac WD

Kern Delta WD

Wheeler Ridge-Maricopa WSD

Henry Miller WD

West Kern WD

Buena Vista WSD

Semitropic WSD

Lost Hills WD

Berrenda Mesa WD

Devils Den WD

Belridge WSD

Lake Isabella

Kern River

Lebec CWD

California Aqueduct

Friant-Kern Canal

Bakersfield

Cross Valley Canal

NON-GROUNDWATER AREAS

GROUNDWATER AREAS

Semitropic Groundwater Banking Program

Kern Fan Banking Unit Berrenda Mesa Project City of Bakersfield 2,800 acres Kern Water Bank Pioneer Project West Kern-Buena Vista Project

Arvin-Edison Water Management Program

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Kern County Conjunctive UseMajor PartnersKern County WA, Arvin-Edison WSD, Buena Vista WSD, Cawelo WD, Semitropic WSD, North Kern WSD & Kern Water Bank Authority

Current projectsIncreased recharge and extraction capacityCVC enlargementCVC Friant Kern IntertiePumping plants for two-way Friant Kern Canal$46 million in Prop 13 fundingIntegrates all surface suppliesImproves dry-year yield

How will climate change affect you?Changes in precipitationChanges in runoff Sea level rise

Increasing TemperaturesProjections

From: Dettinger, 2005

jwoodlin - Probably too detailed

Water Resource Impacts from Increased Temperatures

Less precipitation falling in the form of snow

Earlier snowmelt

Changes in water demand

Increased evapotranspiration losses

Changes in watershed vegetation and related changes in runoff

Increased water temperatures and increased demand for temperature control releases from reservoirs

Increased water temperatures and increased water column productivity (increased algae production, etc.)

Responses to Climate ChangeMitigationAB 32 reduced GHG emissions

AdaptationConservationSurface StorageConjunctive UseLand Use

Needs and IssuesTechnicalStream/Aquifer InteractionClimate changeEnvironmental Benefits/ConsequencesWater Quality Implications of Recharge Subsidence Measurement and MonitoringImproved ModelsEnergy relationshipsSite Specific FactorsScience-based Policy

Needs and IssuesPolitical/InstitutionalLand useWater agency vs. County control Public trust vs. private use Water QualityLegalWater rightsStorage rightsEconomicThird party impactsBenefit/CostPublic funding

The End