Water Planning & Stewardship Committee Item #6b Summary

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Water Planning & Stewardship CommitteeItem #6bSummary

Water Planning & Stewardship CommitteeItem #6bSummary

Subject: Review of Long-Term Delta Actions & Water Supply Planning Implications

Purpose: To open discussions with board members for further direction or recommendations regarding long-term Delta actions.

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Water Planning & Stewardship CommitteeItem #6b

Water Planning & Stewardship CommitteeItem #6b

Summary: Recent actions to protect Delta smelt is likely to challenge MWD and other water users with more prolonged curtailments. In addition, two ongoing efforts (Bay Delta Conservation Plan & Governor’s Delta Vision) are developing long-term solutions, with a recommendation targeted for the end of 2007.

This Board Report provides more detailed information on potential long-term actions, and water supply planning implications.

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Delta Long-Term OptionsDelta Long-Term OptionsWater Planning and Stewardship CommitteeWater Planning and Stewardship Committee

6b6bAugust 20, 2007August 20, 2007



Delta Vision Process -- Long-Term OptionsDelta Vision Process -- Long-Term Options

Other Stakeholder Vision StatementsOther Stakeholder Vision Statements

4







Sac River

Sac River

Sac River

Sac RiverSacramentoSacramentoSacramentoSacramento

StocktonStocktonStocktonStockton

Long-Term VisionLong-Term VisionAlternative ‘Alternative ‘AA’ – Existing Delta with Fortified Levees ’ – Existing Delta with Fortified Levees


SWP PumpsSWP PumpsSWP PumpsSWP Pumps

CVP PumpsCVP PumpsCVP PumpsCVP Pumps

AA

Suisun MarshSuisun MarshSuisun MarshSuisun Marsh

Yolo BypassYolo BypassYolo BypassYolo Bypass

55

Performance– Fishery and water supply conflict remain– Continued vulnerability to seismic risks and

sea-level rise

66



Sac River

Sac River

Sac River



Long-Term VisionLong-Term VisionAlternative ‘Alternative ‘BB’ – Eco-Crescent / Middle River Corridor ’ – Eco-Crescent / Middle River Corridor




Delta Smelt Delta Smelt HabitatHabitat


BB

77

Sac River

Sac River

Sac River









BB

Old RiverOld RiverMiddle RiverMiddle River

88

Sac River

Sac River

Sac River







Suisun MarshSuisun MarshSuisun MarshSuisun Marsh

Yolo BypassYolo BypassYolo BypassYolo Bypass



BB

99

Performance– Stop-gap measure to benefit delta smelt– Continued vulnerability to seismic risks and

sea-level rise– Near-term ecosystem and water supply

benefits

1010



Sac River

Sac River

Sac River



Long-Term VisionLong-Term VisionAlternative ‘Alternative ‘CC’ - Dual-Intake Conveyance’ - Dual-Intake Conveyance

(Eco-Crescent + Conveyance Canal)(Eco-Crescent + Conveyance Canal)





CC

BB

1111

Performance– Addresses vulnerability to seismic risks &

sea-level rise– Operational flexibility– Reduction of fish mortality– Near-term ecosystem and water supply benefits

1212





Sac River

Sac River

Sac River



Long-Term VisionLong-Term VisionAlternative ‘Alternative ‘DD’ - Fully Isolated Conveyance ’ - Fully Isolated Conveyance




DD

1313

Performance– Reduces vulnerability to seismic risks and

sea-level rise– Improved export water quality– Enhances fishery habitat throughout Delta– Enhances ability to screen fish

1414



Alternative Alternative Planning, Design, Planning, Design, ConstructionConstruction

Existing Delta Existing Delta (w/ Fortified Levees)(w/ Fortified Levees)

Levee Rehab Costs TBDLevee Rehab Costs TBD

Eco-CrescentEco-Crescent $0.1 – 0.3 billion$0.1 – 0.3 billion

Fully IsolatedFully Isolated $3.3 – 3.8 billion$3.3 – 3.8 billion

Dual-Intake Dual-Intake (Eco-Crescent + Conveyance (Eco-Crescent + Conveyance

Canal)Canal)$3.8 – 4.4 billion$3.8 – 4.4 billion

Cost ComparisonCost ComparisonLong-Term AlternativesLong-Term AlternativesCost ComparisonCost ComparisonLong-Term AlternativesLong-Term Alternatives

1515

Water Quality ComparisonWater Quality ComparisonLong-Term AlternativesLong-Term Alternatives

Water Quality ComparisonWater Quality ComparisonLong-Term AlternativesLong-Term Alternatives

ExistingExisting Eco-CrescentEco-CrescentDual-Intake/Fully Dual-Intake/Fully Isolated Facility Isolated Facility

(5,000 – 15,000 cfs)(5,000 – 15,000 cfs)

SalinitySalinity (TDS)(TDS) 234 mg/l234 mg/l

5% 5% improvementimprovement

(222 mg/l)(222 mg/l)

32 – 57% 32 – 57% improvementimprovement

(159 to 100 mg/l)(159 to 100 mg/l)

BromideBromide 200 ug/l200 ug/l5% 5%

improvementimprovement(190 ug/l)(190 ug/l)

56 – 90% 56 – 90% improvementimprovement

(88 to 20 ug/l)(88 to 20 ug/l)

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Water Reliability ComparisonWater Reliability ComparisonLong-Term Alternatives (SWP Deliveries)Long-Term Alternatives (SWP Deliveries)

Water Reliability ComparisonWater Reliability ComparisonLong-Term Alternatives (SWP Deliveries)Long-Term Alternatives (SWP Deliveries)

Existing *Existing * Eco-CrescentEco-Crescent Dual-Intake/Fully Dual-Intake/Fully Isolated FacilityIsolated Facility

Low Low ReliabilityReliability

(2.4 - 3.0 MAF)(2.4 - 3.0 MAF)

MediumMediumReliabilityReliability(2.6 –2.8 MAF)(2.6 –2.8 MAF)

HighHighReliabilityReliability(3.0+ MAF **)(3.0+ MAF **)

* Current supplies at risk due to fishery declines** Preliminary studies – alternative capacities/sizes being modeled* Current supplies at risk due to fishery declines** Preliminary studies – alternative capacities/sizes being modeled

1717

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Stakeholder Vision StatementsStakeholder Vision StatementsStakeholder Vision StatementsStakeholder Vision Statements

Environmental Caucus In-Delta Agriculture Allied Fishing Groups Restore the Delta Coalition Environmental Justice Coalition for Water Contra Costa Council (Business) DWR and US Bureau of Reclamation Other Individuals

1919

SacramentoSacramentoSacramentoSacramento



CVP PumpsCVP PumpsCVP PumpsCVP Pumps2020

Documents

Water Planning & Stewardship Committee Item #6b Summary