Calculate the freeboard for the top levels of the side walls if the mean velocity of water in the chute reach is 3.5 m/s and the mean depth of water in the chute reach under consideration is 4.7 m.

(a) 0.60 m

(b) 1 m

(c) 0.85 m

(d) 0.55 m

This question was addressed to me in class test.

I need to ask this question from Chute Spillway topic in section Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering