Correct option is B
The
overflowing sheet of water on a weir is termed as the
nappe. It is the water that flows over the crest of the weir, forming a smooth, continuous sheet as it falls downstream.
Definitions of Other Terms:
·
Head:
· Refers to the height of water above the crest of the weir.
·
Upstream:
· Refers to the area or side of the weir where the water is stored before flowing over the crest.
·
Crest:
· Refers to the top edge of the weir over which the water flows.
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