Agriculture Drainage Calculator

You can calculate the number of acres that can be drained with a known pipe size by completing the three fields below and clicking "Calculate."

% Slope:    Pipe Size:      Single Wall N-12


GPM CFS Acre-in/24 hrs  

Notes: GPM = Gallons per minute. CFS = cubic feet of water per second.

Acres Drained:

Drainage Coefficient(in/24 hours)

1" ¾" ½" ⅜" ¼" ⅛"

Note: Drainage coefficient = Rate of water removal in a 24 hour period in inches.

You can also calculate pipe size with known acres to be drained.