TGPSC HMWSSB Manager 2015 Paper 2 · Question 77

Question 77 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) · Q77 · Environmental Engineering · Water Supply

   A sedimentation tank 6m wide, 15m long and 3m water depth is treating 2MLD of water. The surface overflow rate in lt/hr/m² is

   1. 858
   2. 926
   3. 1028
   4. 748
   Show answer

   Answer: (2) 926

   Surface overflow rate = Q/(plan area) = 2×10⁶ litres/day ÷ (6 × 15 = 90 m²) = 22,222 lt/day/m² ÷ 24 ≈ 926 lt/hr/m²; the depth does not enter the calculation.

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