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Which of the following statement is wrong?

[A].	In a trapezoidal notch fall, the top width of the notch is kept between 3/4th to full water depth above the sill of the notch.	[B].	The energy dissipation takes palce by the provision of roughening devices.
[C].	The siphon fall is designed to maintain a fixed supply level in the channel.	[D].	Energy dissipators are provided for small discharges.

Answer: Option D