Irrigation - Engineering

Q1:

Pick up the incorrect statement from the following

A Side walls of a venturi head flume are splayed out from the end of the throat at 1 : 10 for a length of 4.5 m

B Length of side walls should be such that the width of the flume is made equal to 2/3rd the bed width of the distributary

C Once the width of the flume becomes 2/3rd of the width of the distributary, the splayed walls are increased to 1 in 3 to get full bed width

D None of these.

ANS:D - None of these.

Anyone, explain the right answer clearly.