Discussion
When the bed slope of the discharge carrier in a chute spillway changes from steeper to milder, we provide a
Answer: A
A concave vertical curve is provided.
Where the floor of a chute changes from a steeper slope to a milder one, the profile bends upwards, like the bottom of a valley. That change is made with a concave (sag) vertical curve, usually a circular arc of generous radius, so that the fast-moving water is turned gradually and the dynamic pressure on the floor stays within limits.
A convex vertical curve is needed in the opposite case, where the slope changes from milder to steeper; it must be flat enough (shaped to the jet trajectory) for the flow to stay in contact with the floor. A reverse curve is an S-shaped combination of the two, and a converging transition narrows the chute in plan, not in profile.
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