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Functions of divide wall, undersluice, silt devices

Short answer

Divide wall separates the quiet pocket from weir flow, prevents cross currents, and protects sluices. Under sluices scour silt from the pocket and pass low floods. Silt excluder diverts silty bottom water through tunnels to the river, keeping canal water clear. Silt ejector extracts silt from the canal downstream and returns it to the river.

Explain the functions of the divide wall, under sluices, silt excluder, and silt ejector at the diversion headworks.

  • Divide wall. A wall between the weir and the undersluices (on the head regulator side). It separates the quiet pocket in front of the regulator from the weir, prevents cross currents, protects the sluices from high-velocity flood flow, and also forms one side of the fish ladder.
  • Undersluices. Low-level gated bays beside the head regulator. They scour the silt that settles in the pocket, keep a clear channel in front of the regulator, and pass the low floods.
  • Silt excluder. Tunnels built in the pocket in front of the head regulator. They let the clear upper water go into the canal and pass the silty bottom layer through the undersluices to the river, so the canal water carries less bed load.
  • Silt ejector (extractor). A device on the canal, a little below the regulator, which removes the silt that has entered the canal. Tunnels carry the bottom layer to an escape channel and back to the river.

✓ Answer checked by Claude Opus 5.5 (high effort)

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