Answer: D. Trapezoidal
A Cipoletti weir is a Trapezoidal weir.
It is a trapezoidal weir. The slopes of cipoletti weir are adjusted in such a way that , the reduction in discharge due to end contraction in the rectangular weir equals the increase in discharge due to triangular portion
tanΘ/2 = 1Θ/4 = 28o
Cd = 0.63
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