Step 1:

Enter the Square Feet Drained: 

Step 2:

Choose the Coefficient of Runoff: 

Step 3:

Choose the 25 Year Rainfall

Note: To get your 25 Year Rainfall,
click here to view the US 25-year rainfall map.

Step 4:

Press the Calculate button for results

Step 5:

View your results below

Liquid Flow:

0 Gallons per Minute (GPM)
0 Cubic Feet of Water per Second

Volume of water to be stored:

0 Gallons
0 Cubic Feet