TGPSC HMWSSB Manager 2015 Paper 2 · Question 61

Question 61 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.

1. Manager 2015 Paper 2 (Civil) · Q61 · Water Resources & Irrigation · Irrigation Engineering

   Syphon aqueduct is a cross drainage work provided to carry canal over a natural drain when

   1. Canal bed is well above the HFL of the natural drain
   2. Canal bed is at the same level as the bed of the natural drain
   3. Canal bed is below the HFL of the natural drain
   4. Canal bed is below bed of the natural drain
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   Answer: (3) Canal bed is below the HFL of the natural drain

   When the drain's HFL rises above the canal bed, the drain water passes under the canal through barrels flowing under pressure (syphonic action), so the structure is a syphon aqueduct; if the canal bed is well above the HFL it is an ordinary aqueduct.

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