A stilling basin is the one 

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BPSC AE Paper 6 (Civil) 11 Nov 2022 Official Paper
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  1. which is provided at the foot of a spillway for energy dissipation
  2. which is provided in head race for desilting purposes 
  3. which is used to regulate the water supply to a power plant
  4. None of the above

Answer (Detailed Solution Below)

Option 1 : which is provided at the foot of a spillway for energy dissipation
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Detailed Solution

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Explanation:

  • According to IS 4997-1968: Stilling basin is a structure in which all or part of energy dissipating action is confined. In stilling basin kinetic energy first causes turbulence and is ultimately lost as heat energy.
  • Stilling basin is located at downstream of the spillway and is used for energy dissipation.

Type of Stilling Basin:

  1. Hydraulic jump-type stilling basin
  • Horizontal apron type;
  • sloping apron type;

      2. Jet diffusion and free jet stilling basin
  • Jet diffusion basin;
  • Free jet stilling basin;
  • Hump stilling basin;
  • Impact stilling basin;

Screenshot 2022-10-09 at 11-17-59 IS 11527 Criteria for structural design of energy dissipators for spillways Bureau of Indian Standards Free Download Borrow and Streaming Internet Archive

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