Enter the water depth (in) and the elapsed time (min) into the Soil Infiltration Rate Calculator. The calculator will evaluate the Soil Infiltration Rate.

## Soil Infiltration Rate Formula

The following two example problems outline the steps and information needed to calculate the Soil Infiltration Rate.

SIR = WD / T
• Where SIR is the Soil Infiltration Rate (in/min)
• WD is the water depth (in)
• T is the elapsed time (min)

To calculate soil infiltration rate, divide the water depth by the elapsed time.

## How to Calculate Soil Infiltration Rate?

The following example problems outline how to calculate Soil Infiltration Rate.

Example Problem #1:

1. First, determine the water depth (in).
• The water depth (in) is given as: 5.
2. Next, determine the elapsed time (min).
• The elapsed time (min) is provided as: 30.
3. Finally, calculate the Soil Infiltration Rate using the equation above:

SIR = WD / T

The values provided above are inserted into the equation below and computed.

SIR = 5 / 30 = .167 (in/min)

Example Problem #2:

For this problem, the variables required are provided below:

water depth (in) = 6

elapsed time (min) = 10