Find the intensity of Rainfall When the duration of Rainfall is Given
First of all, we need to know the formula used to determine rainfall intensity. There are three types of empirical formula, they are
a) For storm duration 5 to 20 minutes
b) For storm duration 20 to 100 minutes
c) Where rainfall is frequent
Here, i = Intensity of rainfall in mm/hr, t = duration of storm in minutes.
Following are the two mathematical example for the determination of rainfall intensity
Mathematical Problem: 1
Find the intensity of rainfall when the storm continues for a period of 75 minutes.
As the duration of rainfall is in between 20 to 100 minutes, so the formula will be
The intensity of rainfall,
Mathematical Problem: 2
Find the intensity of rainfall when the rainfall occurs frequently and the total duration of rainfall is 115 minutes:
As the rainfall occurs frequently, we will use 3rd formula,
So, the intensity of rainfall is