Question

The Ryve's formula to determine the design discharge from catchment is given by (constant depending on nature of the catchment and location = C; catchment area in
square kilometers = A)
1. CA^3/2
2. CA^2/3
3. AC^3/2
4. AC^2/3

Answer 1

Correct Answer - Option 2 : CA^2/3

Explanation:

Ryve’s Method

This formula is used only in Southern India.

\({Q_P} = {C_R}{A^{\frac{2}{3}}}\)

Rational Method

This method is based on the principle of the relationship between rainfall and runoff. Hence, it can be considered to be similar to empirical method.

\({Q_P} = \frac{1}{{36}}k{P_c}{A^1}\)

Dicken’s Method

It was earlier adopted only in Northern India but now it can be used in most of the States in India after proper modification of the constant.

\({Q_P} = {C_D}{A^{\frac{3}{4}}}\)

Inglis Method

This formula is used only in Maharashtra. Here three different cases are taken into consideration.

\({Q_P} = \frac{{124A}}{{\sqrt {A + 10.4} }} \cong 123\sqrt A\)

where

QP = Peak discharge in m3/s.

A = Area in km2.