## Rainfall Intensity

**. It is expressed in cm / hr. It can be determined with the help of automatic rain gauges.**

*The rainfall intensity is the rate at which it is falling*Rainfall Intensity And Their Formula |

The intensity of rainfall ig greater when shorter periods are considered while it is lower when large periods are considered.

### Formula Of Rainfall Intensity

The intensity of rainfall (p) in mm/hr is given by the following general formula:

**p = 254a / (t+b) mm/hr**

Where,

**t**= Duration of storm in minutes,**a**and**b**are constants.
The following value of

**a**and**b**are considered adequate**a = 30 and b = 10 when t is 5 to 20 minutes.****a = 40 and b = 20 when t is 20 to 100 minutes.**

### Duration of Rainfall

The duration of rainfall is the time for which rain falls with given intensity.

### Frequency of Rainfall

The frequency of rainfall is the number of times it falls.

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