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.

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