1 December 19, 2007 North-of-the-Delta Offstream Storage Project Overview State of California Department of Water Resources U.S. Department of the Interior Bureau of Reclamation

2 Feasibility Study Phases Initial Alternatives Plan Formulation Feasibility Study

3 Feasibility Study Phase  Refine and compare alternatives Refine operations Complete feasibility-level design and cost estimates Evaluate environmental effects Perform benefit/cost analysis  Prepare feasibility report and environmental documents (EIS/EIR)  Refine and compare alternatives Refine operations Complete feasibility-level design and cost estimates Evaluate environmental effects Perform benefit/cost analysis  Prepare feasibility report and environmental documents (EIS/EIR)

4 Planning Objectives  Primary Objectives: Increase water supply and water supply reliability and Sacramento Valley water management flexibility Improve Delta water quality Increase the survival of anadromous fish populations in the Sacramento River, as well as the health and survivability of other aquatic species  Secondary Objectives: Provide ancillary hydropower generation Provide additional recreational opportunities Provide incremental flood damage reduction benefits  Primary Objectives: Increase water supply and water supply reliability and Sacramento Valley water management flexibility Improve Delta water quality Increase the survival of anadromous fish populations in the Sacramento River, as well as the health and survivability of other aquatic species  Secondary Objectives: Provide ancillary hydropower generation Provide additional recreational opportunities Provide incremental flood damage reduction benefits

5 Facilities Sites Reservoir Storage Capacity: 1,800 TAF

6 Potential Benefits  Support ecosystem restoration  Increase water supply and water supply reliability for: Urban Agricultural Environmental  Improve Delta water quality  Improve system flexibility  Provide ancillary hydropower generation  Improve flood protection  Increase recreational opportunities  Provide for Delta emergency response  Support ecosystem restoration  Increase water supply and water supply reliability for: Urban Agricultural Environmental  Improve Delta water quality  Improve system flexibility  Provide ancillary hydropower generation  Improve flood protection  Increase recreational opportunities  Provide for Delta emergency response

7 Improve System Flexibility  Sites can provide much needed flexibility to the state’s constrained water management system  Sites can be operated to contribute to the long-term sustainability of the Delta ecosystem, maintain water quality and supply reliability, and mitigate the effects of Delta levee failure  Restoration Action storage could be adaptively managed to support restoration actions in the Sacramento River and the Delta  Added flexibility from Sites can also improve the viability and effectiveness of conjunctive management, water exchanges and transfers  Sites can provide much needed flexibility to the state’s constrained water management system  Sites can be operated to contribute to the long-term sustainability of the Delta ecosystem, maintain water quality and supply reliability, and mitigate the effects of Delta levee failure  Restoration Action storage could be adaptively managed to support restoration actions in the Sacramento River and the Delta  Added flexibility from Sites can also improve the viability and effectiveness of conjunctive management, water exchanges and transfers

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9 Shasta Sites Oroville Folsom ●Provide Stable Flows – Keswick to Colusa ●Increase Cold Water Pool in Shasta Lake ●Improve Fish Passage at RBDD ●Reduce Diversions at TC and GCID Canals ●Provide Supplemental Flows for Cottonwood Establishment ●Provide Stable Flows – Keswick to Colusa ●Increase Cold Water Pool in Shasta Lake ●Improve Fish Passage at RBDD ●Reduce Diversions at TC and GCID Canals ●Provide Supplemental Flows for Cottonwood Establishment Ecosystem Restoration Actions 99

10 Planning Schedule Initial Alternatives Information Report Plan Formulation Report Final Feasibility Report & EIS/EIR Define Initial Alternatives Develop & Evaluate Alternatives Draft Feasibility Report & EIS/EIR

11 Sacramento River Daily Operations Model (DOM)

12 Sacramento River DOM Will provide the foundational daily flow dataset for a number of recently developed models:  Reclamation’s Sacramento River Water Quality Model  TNC Sacramento River Ecological Flows Tool  Reclamation’s Models on Physical River Processes and Riparian Habitat on the Sacramento River  DWR (NODOS) Winter-Run and Spring-Run Life Cycle IOS Models Will provide the foundational daily flow dataset for a number of recently developed models:  Reclamation’s Sacramento River Water Quality Model  TNC Sacramento River Ecological Flows Tool  Reclamation’s Models on Physical River Processes and Riparian Habitat on the Sacramento River  DWR (NODOS) Winter-Run and Spring-Run Life Cycle IOS Models

13 Sacramento River DOM Status  Reservoir operations calibrated based on historical flood and uncontrolled release operations of 1995 – 2003  QA / Agency review and CALSIM II interface need to be completed to support scenario (i.e. project or program) analyses  Methodology has been applied to develop a “hindcast” of the daily flows for 1964 – 2003  Reservoir operations calibrated based on historical flood and uncontrolled release operations of 1995 – 2003  QA / Agency review and CALSIM II interface need to be completed to support scenario (i.e. project or program) analyses  Methodology has been applied to develop a “hindcast” of the daily flows for 1964 – 2003

14 DOM Hindcast  Useful for calibration and verification of models (specifically model efforts that require daily flows from Keswick Dam to Knights Landing)  Some concerns remain about the routing and operations between Ord Ferry and Knights Landing due to sparseness in observations  Does not provide scenario testing capability, but will inform the DOM development as it is integrated with the CALSIM II model  Useful for calibration and verification of models (specifically model efforts that require daily flows from Keswick Dam to Knights Landing)  Some concerns remain about the routing and operations between Ord Ferry and Knights Landing due to sparseness in observations  Does not provide scenario testing capability, but will inform the DOM development as it is integrated with the CALSIM II model