In-Delta Storage Program Engineering Investigations Control Structures Stakeholders Committee Meeting January 22, 2003 Jeremy Arrich

Reservoir Island Flow Control Structures Four Integrated Facilities Two on Webb Tract; Two on Bacon Island Purpose is to combine all operational components into a single facility for more efficient operations Operational Components include: Fish Screen Inlet/Outlet structures Pumping Plant Bypass Channel Goal is to maximize gravity flow and minimize pumping to reduce operation and maintenance costs

Four Integrated Facilities Two on Webb Tract and Two on Bacon Island

Pumping/Gravity Conduit Integrated Facility Components Pumping Plant Gate Structure Pumping/Gravity Conduit Bypass Channel Engineered Embankment Reservoir 2 3 Forebay Mid-bay Afterbay 1 Trash Rack Transition Pool Fish Screen Sheet Pile Wall River River

Integrated Facility Diversion Flow Paths Reservoir 2 3 1 River River Diversion From River

Integrated Facility Release Flow Paths Reservoir 2 3 1 River River Release To River

Diversion & Release Flow Paths Integrated Facility Diversion & Release Flow Paths Reservoir 2 3 1 River River Release To River Diversion From River

Key Features of Integrated Facility Fish Screen is isolated from other controls with a transition pool Storage diversions and releases can occur when the river and reservoir are at different levels, allowing for year-round operations Diversions and releases are optimized with gravity flow and pumping combinations Required flow under gravity is possible with small head differences Low pool level and pumping units allow for complete drainage of reservoir when necessary

Ongoing Work Finalizing design criteria and procedures for hydraulic analysis and structural design Performing hydraulic analysis to optimize sizes for the fish screen, inlet outlet structures, pumping plant, and bypass channel Preparing structural design for all Integrated Facility components Coordinating with: DWR’s Division of Engineering USBR Central Valley Fish Facilities Review Team (CVFFRT) Consulting Teams CVFFRT has been briefed on the proposed fish screen design, facility layout, and overall operations CVFFRT gave a positive response to the proposed concept