How to calculate Gravel for a French Drain with a calculator
The French drain calculator can give you an estimate of how much gravel is needed.
There are affiliate links on this page.I earn a small commission if you buy through them.I would like to thank you for buying through these links.Jake.
The French drain is deep.The standard depth is about 12 inches.This will allow for about 5′′ above a drain pipe and 3′′ of top soil above that.
If there are humps or variability in the slope of the area being trenched, the depth may need to be increased.The pitch can be maintained throughout the entire length of the drain.
Hit calculate after entering the outside diameter of the drain pipe being installed in the trench.For most residential applications, a 4′′ pipe is sufficient.The pipes have an outside diameter of 4.215′′.