Assign Annual Demand for a Purpose

1. Single Purpose AnalysisIterative Process for Single Purposes – WQ and RF Decrease Annual Demand Decreased Assign Annual Demand for a Purpose CALSIM Simulation Compare the Long-termAverage Annual Friant Unit Delivery to Benchmark Study CALSIM Simulation Completed Same Increased IncreaseAnnual Demand

2. Single Purpose Analysis Millerton Lake Water Budget Components NOT TO SCALE Forecasted Inflow Rain Flood Release Dynamic allocated based on hydrologic conditions and reservoir storage Available Waterfor Canal Delivery Allocation RF Demand Prescribed based on constant or year-type varying demand patterns WQ Demand Available Storage D/S Water Rights Evaporation Canal Loss River Loss Annual Reservoir Available Water

3. Multi-Purpose Analysis Millerton LakeWater Budget Components NOT TO SCALE Forecasted Inflow Rain Flood Release Rain Flood Release Available Waterfor Canal Delivery Allocation Available Waterfor Canal Delivery Allocation Dynamic allocated based on hydrologic conditions and reservoir storage Carryover Requirement RF Demand RF Demand WQ Demand Available Storage WQ Demand D/S Water Rights D/S Water Rights Evaporation Evaporation Canal Loss Canal Loss River Loss River Loss Annual Reservoir Available Water Reservoir with Carryover Storage

4. Initial Evaluation Approach for USJRBSI, Phase 1 • Friant Enlargement Concept • Evaluation scenario only – not an alternative • Increase Millerton Lake by 700 TAF • Simulate operations with additional storage • Identify how problems and opportunities could be addressed. • Use results to guide definition of “Functional Equivalence” • Initial Modeling Assumptions • Based on existing conditions and honoring current laws, rules, and regulations.

5. Initial Evaluation Approach for USJRBSI, Phase 1 Single Purpose Analysis Approach • Initial analysis • Identify the potential water that could be available from a Friant enlargement to address a single problem area • Water quality, supply reliability, or restoration • Identify how other problems and opportunities could be affected • Water quality • River restoration • Water supply reliability • Flood control • Hydropower • Delta inflow

6. Initial Evaluation ApproachSingle Purpose Analysis • Single Purpose Analysis – Operate to address one goal only • Single Purpose - Water Supply (WS) • Single Purpose - Water Quality (WQ) • Single Purpose - Restoration Flow (RF) • Same water supply allocation logic • Maximize the annual water supply to each purpose while maintaining long-term annual total delivery.

7. Single Purpose Analysis (Preliminary Assumptions) Scenarios

8. Single Purpose Analysis (Preliminary Assumptions)Demand Development Demand Development for Single Purposes – WQ and RF Needed for Single Purpose Analysis ? Operating Friant as an Annual Reservoir? Phase of Demand Pattern Development Status Annual Demand

9. Single Purpose Analysis (Preliminary Results) Summary ofCALSIM Results Average Annual Water Allocations for Each Purpose (TAF) Scenario

10. Single Purpose Analysis (Preliminary Results) Annual AverageFriant UnitDelivery Delivery in TAF (Difference from Benchmark)

11. Single Purpose AnalysisNext Steps • Introduce year-type dependent demands for water quality and restoration flow; Options include • Annual quantity based on predetermined proportion • Benchmark Study water delivery amounts by year type • Unimpaired flow amounts by year type • Option to include reductions in a multi-year drought • Refine approach to preserve long-term average delivery • Annual average deliveries by year type • Water supply reliability similar to that of the Benchmark Study • Develop guidelines for evaluating impacts • Ecosystem, water quality, water delivery, economics, etc.