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Which of the following intake structure types suitability is true in case of a water supply scheme?

  • A.A masonry or RCC intake tower (or intake well) is placed downstream of the gravity dam for augmenting water supply.
  • B.An underground intake chamber consisting of stone masonry in the bed of the river is used for river-based water supply.
  • C.A siphonic intake from the middle of the canal is used for augmenting the water supply from the canal.
  • D.Submersible type of intake structures are normally used for lake-based water supply.

Answer: D

The statement that submersible intake structures are normally used for lake-based water supply is the true one, as the key shows. A submerged intake sits below the water surface in the lake and draws water from there, so it works at every level of the lake. The other statements do not describe the usual practice: an intake tower is placed upstream of a dam (in the reservoir), not downstream, an underground chamber in the river bed is not the usual river intake, and a siphonic intake at the middle of the canal is not the way a canal supply is augmented.

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