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## 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 × A**^{3/4}

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 A**^{2/3}

Where,

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

### 3. Inglish Formula

Where,

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

### 4. Dredge or Burge’s Formula

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

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How to Calculate Annual Runoff – Problem & Solution