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What is the shape of upstream wings in design of baffle fall?

What is the shape of upstream wings in design of baffle fall? Correct Answer Circular

The shape given to upstream wings is circular of radius 3.6H3/2 (H = total head over crest) when H is more than 0.3m and 2H when H is less than 0.3m. These circular wings are continued till they subtend an angle of 60 degrees at the centre.

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