# Which of the following is Ryve’s formula, to be used for flood estimation

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GPSC AE CE 2017 Official Paper (Part B - Civil)
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1. Q = C × A2/3
2. Q = C × A3/4
3. Q = C × An
4. Q = C × A1/2

Option 1 : Q = C × A2/3
Free
ST 22: Geotechnical Engineering
1350
20 Questions 20 Marks 15 Mins

## Detailed Solution

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.

CR = CD = coefficient applicable in certain region.

6 < CD < 30

6 < CR < 11
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