# Empirical Formula Used For Determination of Runoff

## Empirical Formula Used For Determination of Runoff

The following empirical formulas or equations are generally used for estimating the runoff from a catchment:

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### 1. Dicken’s Formula

Q = C × A3/4

Where,

• Q = Runoff in cumec.
• C = a coefficient varies from 11.5 to 25.
• A = Catchment area in sq.km.

### 2. Ryve’s Formula

Q = C A2/3

Where,

• Q = Runoff in cumec
• C = a coefficient varies from 6.75 to 10
• A = Catchment area in sq.km.

### 3. Inglish Formula

$\large Q = \tfrac{123 A}{\sqrt{A + 10.4}}$

Where,

• Q = Runoff in cumec.
• A = Catchment area in sq.km.

### 4. Dredge or Burge’s Formula

$Q = 19.6\, \frac{A}{L^{2/3}}$

• Q = Runoff in cumec.
• A = Catchment area in sq.km.
• L = Length of the drainage basin in kilometres.