The 'ogee' spillway profile is designed to follow:
Choose the correct answer
A straight inclined slope
The trajectory of the free water nappe over a sharp-crested weir — provides maximum discharge with minimum downstream head
A circular arch
A parabolic arch with tension members
Correct Answer
B. The trajectory of the free water nappe over a sharp-crested weir — provides maximum discharge with minimum downstream head
Why is this the answer?
Ogee spillway profile: shaped to match the lower nappe of a free-overfall jet from a sharp-crested weir for the design head Hd. Above crest: upstream quadrant curves; below crest: downstream quadrant matches nappe trajectory. At design flow: no pressure on spillway face. Below design head: positive pressure (no cavitation); above design head: negative pressure (cavitation risk).
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