Correct Answer - Option 4 : A stilling pool
Definition of stilling basin:
A depression in a channel or reservoir deep enough to reduce the velocity or turbulence of the flow.
IS code for stilling basin (IS 4997): Criteria for design of hydraulic jump type stilling basins with horizontal and sloping aprons.
How does the energy dissipation occur in stilling basin:
Aprons concrete impact basin is an energy-dissipating device located at the outlet of the spillway in which flow from the discharge conduit strikes a vertical hanging baffle. Energy dissipation occurs as the discharge strikes the baffle, thus, performance is not dependent on the tailwater.
- Stilling basin energy dissipator with pool - MLL Concrete
- Stilling basin energy dissipator with pooapronsl