Delta Emergency Response Concepts Actions DWR Can Take Today

1. Delta Emergency Response ConceptsActions DWR Can Take Today Division of Flood Management California Department of Water Resources Van Sickle Island, Dec 2005 – Jan. 2006 Floods

2. Planning for Delta Emergencies DWR - Division of Flood Management

3. Types of Delta Emergencies Small-scale events:One or two islands  Flood event  Summer time single island failure Large-scale events:Multiple islands or entire regions  Seismic event  Flood event  Major toxic or waste water spill Long-term trends: Local or regional  Invasive species  Ecological declines  Seepage / subsidence  Climate change / sea level rise DWR - Division of Flood Management

4. Large-Scale Seismic Event DWR - Division of Flood Management

5. DRMS Worst Case Scenario 50 levee failure / breach locations in Central and South Delta 20 islands flooded Long-term recovery estimated to take over one year Large-Scale Island Flooding DWR - Division of Flood Management

6. Worst Case Scenario Overview DWR - Division of Flood Management

7. Goals of DWR Response • Short-term vs. long-term: • Directing a flood fight (life and property) • Securing infrastructure • Securing water supply / water quality • Protect the environment DWR - Division of Flood Management

8. DWR Response Timeframe DWR - Division of Flood Management

9. Building a “Tool-Kit” • Based on a review of various papers, presentations, & reports: • DWR, Statewide OES, Delta counties, State Water Contractors, & other local agencies • Includes reports focused on emergency response & general engineering concepts included in long-term planning processes • Level of detail and scope of all of these reports varies • Some recommendations are dated and conflict DRAFT DWR - Division of Flood Management

10. General Types of Responses • Operational tools • Decreasing export pumping • Increasing upstream releases • Operation of existing structures like DCC • Physical / Site specific • Strategic placement of sheet walls • Installation of emergency pipe lines • Legal • Relaxation of water quality standards DRAFT DWR - Division of Flood Management

11. Examples of DWR Legal Authority Water Code (Section 128): Perform any work required during floods / storms State OES retains authority flowing declaration of emergency Emergency Services Act (Gov. Code Section 8550): Governor may commandeer private property Governor may suspend regulatory statutes & orders Water Code (Section 12994): Effect repairs up to $200k total ($50k per site) in Delta without approval of Reclamation Board or Dept. Fish and Game during a sudden emergency Fish & Game Code (Sections 1601 & 2090): Perform emergency work that impacts some Dept. Fish and Game agreements after providing notice Public Contract Code (Section 10122):Use informal bids to perform emergency repair work DRAFT DWR - Division of Flood Management

12. Responses are initiated from different regions of the state DWR can select specific responses based on the particular event Multiple actions can be initiated as same time Comprehensive list of responses forms a Delta emergency response “Tool-Kit” Regional View DWR - Division of Flood Management

13. Trade-Offs • Changing hydrodynamics and improving water quality has a cost • Responses will have varying impacts on different regions within the Delta DWR - Division of Flood Management

14. Delta-wide Responses EXAMPLE DWR - Division of Flood Management

15. Recommended Actions • Short-term: • Decrease exports as appropriate • Increase releases from some upstream reservoirs as appropriate, taking into account travel times and current storage • Utilize existing rock stockpiles in flood fight • Redirect current state-wide levee maintenance efforts to Delta activities • Intermediate / Mid-term: • Install temporary barriers to limit salinity intrusion due to new tidal prism • Close breaches islands to isolate flooded islands and improve Delta circulation patterns • Long-term: • Use modeling tools to explore consequences of actions before initiating long-term activities • Possibly not dewatering some islands DRAFT DWR - Division of Flood Management

16. Status of DERC • Response actions divided into regions: • Delta-wide, North of Delta, South of Delta,North, Central, South, and West Delta • Detailed technical summaries for each action are being refined: • Each action will have its own summary • Summaries will include discussions on constraints & scaled implementation options • Will recommend several key options based on the documents included in the concept plan • Living “Document”: • Recommendations updated as actions are further defined • Ready-to-Use Presentation will be updated as needed • Deadline: March 1, 2007 DRAFT DWR - Division of Flood Management

17. Next Steps for DERC • Planned Use: • Development of a plan to implement its short-term measures • Guide a formal Emergency Operations Plan (EOP) • Aid in identifying partners whom DWR will need to coordinate the recommended actions • May lead into to the comprehensive planning and recommendations currently underway with other projects such as DRMS DRAFT DWR - Division of Flood Management