Empirical Formula Used For Determination of Runoff
The following empirical formulas or equations are generally used for estimating the runoff from a catchment:
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
[latex]\large Q = \tfrac{123 A}{\sqrt{A + 10.4}}[/latex]
Where,
- Q = Runoff in cumec.
- A = Catchment area in sq. km.
4. Dredge or Burge’s Formula
[latex] Q = 19.6\, \frac{A}{L^{2/3}} [/latex]
- Q = Runoff in cumec.
- A = Catchment area in sq. km.
- L = Length of the drainage basin in kilometers.
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