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عمران::
چرخش قوس
Buckets made out of intersecting planes, warped, or compound surfaces have been used for special applications, but as Mason (1993) states ''few designers would have confidence in a bucket invert for high velocity flow formed by anything other than smooth curves'' tends to lean in favor for a circular arc.
Even where the entrance to the bucket is parabolic, the portion downstream of the bucket invert is circular arc as in Amaluza, Equador, and Baishan, China.
H = Fall from crest to bucket invert.
H = height of the spillway from crest to invert hl = difference between lip level and river bed F1 = Froude number at the bucket invert
ds = Depth of scour below tail water level F = Froude number at bucket invert
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