Agriculture Drainage Calculator

You can calculate your needed drainage pipe size by completing the three fields below and clicking "Calculate.

Acres Drained:    % Slope:   
Drainage Coefficient:    

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

Calculate Reset  

GPM CFS Acre-in/24 hrs

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

Pipe Size:
N-12 Single-wall  

You can also calculate acres drained with known pipe size.