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

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

Drainage Coefficient(in/24 hours)

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.