[amp_mcq option1=”crest” option2=”nappe” option3=”sill” option4=”weir top” correct=”option1″]
The correct answer is: A. crest
The crest is the upper surface of a weir over which water flows. It is the highest point of the weir and is usually horizontal. The crest is designed to control the flow of water and to prevent flooding.
The other options are incorrect.
- B. nappe is the sheet of water that flows over the crest of a weir.
- C. sill is the bottom of a weir.
- D. weir top is the top of the weir, including the crest and the nappe.