1 Water Planning & Stewardship Committee Item #6b Summary 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.

2 Water Planning & Stewardship Committee Item #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 This Board Report provides more detailed information on potential long-term actions, and water supply planning implications.

3 Delta Long-Term Options Water Planning and Stewardship Committee 6b August 20, 2007 Delta Long-Term Options Water Planning and Stewardship Committee 6b August 20, 2007 Delta Vision Process -- Long-Term Options Other Stakeholder Vision Statements

4 Delta Long-Term Options Water Planning and Stewardship Committee 6b August 20, 2007 Delta Long-Term Options Water Planning and Stewardship Committee 6b August 20, 2007 Delta Vision Process -- Long-Term Options Other Stakeholder Vision Statements

Sac River SacramentoSacramento StocktonStockton SWP Pumps CVP Pumps Suisun Marsh Yolo Bypass 5

Performance – –Fishery and water supply conflict remain – –Continued vulnerability to seismic risks and sea-level rise 6

Sac River SacramentoSacramento StocktonStockton SWP Pumps CVP Pumps Delta Smelt Habitat 7

Sac River SacramentoSacramento StocktonStockton SWP Pumps CVP Pumps Delta Smelt Habitat Old River Middle River 8

Sac River SacramentoSacramento StocktonStockton SWP Pumps CVP Pumps Suisun Marsh Yolo Bypass Delta Smelt Habitat 9

Performance – –Stop-gap measure to benefit delta smelt – –Continued vulnerability to seismic risks and sea-level rise – –Near-term ecosystem and water supply benefits 10

Sac River SacramentoSacramento StocktonStockton SWP Pumps CVP Pumps 11

Performance – –Addresses vulnerability to seismic risks & sea-level rise – –Operational flexibility – –Reduction of fish mortality – –Near-term ecosystem and water supply benefits 12

Sac River SacramentoSacramento StocktonStockton SWP Pumps CVP Pumps 13

Performance – –Reduces vulnerability to seismic risks and sea-level rise – –Improved export water quality – –Enhances fishery habitat throughout Delta – –Enhances ability to screen fish 14

Alternative Planning, Design, Construction Existing Delta (w/ Fortified Levees) Levee Rehab Costs TBD Eco-Crescent $0.1 – 0.3 billion Fully Isolated $3.3 – 3.8 billion Dual-Intake (Eco-Crescent + Conveyance Canal) $3.8 – 4.4 billion Cost Comparison Long-Term Alternatives Cost Comparison Long-Term Alternatives 15

Water Quality Comparison Long-Term Alternatives Water Quality Comparison Long-Term Alternatives ExistingEco-Crescent Dual-Intake/Fully Isolated Facility (5,000 – 15,000 cfs) Salinity (TDS) 234 mg/l 5% improvement (222 mg/l) 32 – 57% improvement (159 to 100 mg/l) Bromide 200 ug/l 5% improvement (190 ug/l) 56 – 90% improvement (88 to 20 ug/l) 16

Water Reliability Comparison Long-Term Alternatives (SWP Deliveries) Water Reliability Comparison Long-Term Alternatives (SWP Deliveries) Existing * Eco-Crescent Dual-Intake/Fully Isolated Facility Low Reliability ( MAF) Medium Reliability (2.6 –2.8 MAF) High Reliability (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 17

18 Delta Long-Term Options Water Planning and Stewardship Committee 6b August 20, 2007 Delta Long-Term Options Water Planning and Stewardship Committee 6b August 20, 2007 Delta Vision Process -- Long-Term Options Other Stakeholder Vision Statements

Stakeholder 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 19

SacramentoSacramento StocktonStockton SWP Pumps CVP Pumps 20