To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls
A. Of R.C.C. or steel plate 8 cm thick
B. Of height $${\frac{1}{3}^{{\text{rd}}}}$$ to $${\frac{1}{4}^{{\text{th}}}}$$ the depth of water in the main canal
C. Spaced at interval of $$1\frac{1}{2}$$ times their heights
D. All the above
Answer: Option D
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