ultimate French Drain calculator Calgary

The answer gives you the estimated drainage rate in cubic feet per hour for a French drain system, based on the rainfall intensity, soil type, and dimensions of the drain that you input.

Drainage Calculator

Rainfall Intensity (inches per hour): Light - 2 year event Moderate - 5 year event Heavy - 10 year event Very Heavy - 25 year event Extreme - 50 year event Calgary 100-year intensity rainfall event

Soil Type: Sand or Gravel Sandy Loam or Loam Clay Loam or Clay

Length of French Drain (linear feet):

Width of French Drain (inches):

Depth of French Drain (inches):

Once you have calculated the drainage rate using the calculator, you can use this value to design the drainage system. You will need to determine the capacity of the drainage system necessary to handle the calculated drainage rate. For example, if the calculated drainage rate is 100 cubic feet per hour, you will need a drainage system with a capacity of at least 100 cubic feet per hour to handle the runoff. To design the drainage system, you will need to determine the appropriate size of the pipes, the slope of the drainage system, the number and location of catch basins or other drainage structures, and other factors specific to your site and the local regulations. It is recommended to consult with a professional engineer or experienced contractor to ensure that the drainage system is designed properly and meets all necessary requirements.