(B) in the main channel upstream of the off-taking channel
(C) in the main channel downstream of the off-taking channel
(D) in the watercourse to regulate the outlets
Official Answer Key:
C
Step-by-Step Solution & Explanation
A cross regulator spans the main/parent channel just downstream of an off-take, so that when it is partially closed it backs up (raises) the water level in the main channel at the off-take point, forcing more discharge into the distributary. A head regulator, not a cross regulator, sits at the head of the off-taking channel itself (A is a distractor naming the wrong structure).
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