The main purpose of a diversion headworks (weir or barrage) on a river is to:
Choose the correct answer
Store large volumes of water for use in dry season
Raise the water level in the river to divert water into canals under gravity
Generate hydroelectric power only
Control flooding downstream
Correct Answer
B. Raise the water level in the river to divert water into canals under gravity
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Diversion headworks (weir/barrage + head regulators): raise river water level (pondage) to enable gravity flow into off-taking canals. A weir is a fixed crest structure; a barrage has adjustable gates for greater flow control.
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