Dicken’s formula for flood peak is given by

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TN TRB Civil 2012 Paper
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  1. Q = CA1/3
  2. Q = CA3/4
  3. Q = CA1/4
  4. Q = CA2/3

Answer (Detailed Solution Below)

Option 2 : Q = CA3/4

Detailed Solution

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Dicken’s Method

It was adopted for Northern India.

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

where

QP = Peak discharge in m3/s.

A = Area in km2.

CD = coefficient applicable in the region.

Important Points:

Different empirical method for determining flood discharge are as follows:

Ryve’s Method

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

This formula is used only in Southern India.

Jarvi’s Method

This formula is applicable for Eastern India.

\({Q_P} = C\sqrt A\)

Inglis Method

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

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

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