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South Delta Gates & Barriers Overview

Learn about the history, objectives, and operation of the Gates and Barriers in South Delta to manage water levels effectively. Discover the seasonal and permanent barrier installations and their impact on water quality.

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South Delta Gates & Barriers Overview

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  1. South Delta Gatesand Barriers Some Slides borrowed from Mark Holderman

  2. Temporary Barriers Rock Barriers are installed seasonally on as needed basis Combination of weir/culverts (with flap gates) Objective: To protect water levels in South Delta and offset the effects of pumps

  3. History of Barrier Installations

  4. Grant Line Canal Barrier

  5. Head of Old River Barrier

  6. SDIP Permanent Gates • Bottom Hinged • Provide more flexibility than temp. barriers • Objective: To protect water levels and water quality by creating better circulation in South Delta

  7. Modified Plan C Basic ConceptOperate Ag Barriers to Protect Water Levels and Improve Water Quality (on a as needed basis) • The number of barriers operated depends on the hydrology • All ag barriers fully open during flood tide • Middle River and Old River Barriers are fully closed during ebb tide (When they are operated) • Grant Line Canal Barrier only partially open during ebb-tide to prevent water level problems

  8. Plan C Barrier OperationLow SJR Flows (<2500 cfs) or HOR Operating • Middle and Old River barriers closed during ebb tide • GLC Barrier partially open during ebb tide

  9. Plan C Barrier Operation Intermediate SJR Flows (2500<SJR<4000cfs) & HOR Open • Old River barrier closed during ebb tide • GLC Barrier partially open during ebb tide

  10. Plan C Barrier Operation High SJR Flows (4000<SJR<8000cfs) and HOR Open • GLC Barrier partially open during ebb tide

  11. Plan C Barrier Operation Very High SJR Flows (>8000 cfs) and HOR Open • No need to operate any Ag barriers

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