Question

Which weir is of recent origin and their design is based on modern concepts of sub-surface flow?

(a) Gravity weir

(b) Non-gravity weir

(c) Masonry dam with a vertical drop

(d) Concrete weir with sloping glacis

I got this question in unit test.

Question is from Diversion Head Works in division Diversion Head Works, Hydraulic Jump Usefulness in Irrigation Structure of Irrigation Engineering

Answer 1

Correct option is (d) Concrete weir with sloping glacis

For explanation: The design of concrete weir with sloping glacis is based on the modern concepts of sub-surface flow i.e. Khosla’s theory. Sheet piles are driven at sufficient depths at the upstream and downstream floor end. The hydraulic jump is formed on the downstream sloping glacis to dissipate the energy of the flowing water.