By what value the thickness of notch pier should not be less than the water depth?

By what value the thickness of notch pier should not be less than the water depth? Correct Answer Half the water depth

The thickness of the notch pier should not less than half of the water depth and even it can be more when the pier has to carry a superstructure.

Related Questions

Thickness of 8 tyres L, M, N, O, P, Q, R and S is compared. Thickness of no two tyres is same. Thickness of N is more than L but less than 6 tyres. Thickness of O is more than M but less than Q. Thickness of P is less than only two tyres. Thickness of Q is not more than P. Which of the following statement is not correct?
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)