Under-Sluices And Their Function - Civil Engineering

Wednesday, 27 June 2018

Under-Sluices And Their Function

Under-Sluices or Scouring Sluices

The under-Sluices are the openings which are fully controlled by gates, provided in weir wall with their crest at a low level. They are located on the same side as the off-taking canal.

Under sluices are also called scouring sluices because they help in removing the silt near the head regulators.

Functions of Under-Sluices

i)Preserve a clear and defined river channel approaching the regulator.
ii)Control the silt entry into the canal
iii)Pass the low floods without dropping the shutter of the main weir.
iv)Provide greater water-way for floods, thus lowering the flood level.
v)They scour the silt deposited on the river bed above the approach channel.

Design consideration of Under-Sluices

The silt of the under-sluice pocket is kept at or slightly above the deepest river bed and about 0.9 to 1.8 m below silt of the canal head regulator.
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