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South Delta Gates and Barriers. Some Slides borrowed from Mark Holderman. 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.

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South delta gates and barriers

South Delta Gatesand Barriers

Some Slides borrowed from

Mark Holderman


Temporary barriers
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





Sdip permanent gates
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


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


Plan c barrier operation low sjr flows 2500 cfs or hor operating
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


Plan c barrier operation intermediate sjr flows 2500 sjr 4000cfs hor open
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


Plan c barrier operation high sjr flows 4000 sjr 8000cfs and hor open
Plan C Barrier Operation High SJR Flows (4000<SJR<8000cfs) and HOR Open

  • GLC Barrier partially open during ebb tide


Plan c barrier operation very high sjr flows 8000 cfs and hor open
Plan C Barrier Operation Very High SJR Flows (>8000 cfs) and HOR Open

  • No need to operate any Ag barriers


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