All, I need to set up a grid iron configuration French drain to drain a lot of standing surface water on top of my clay upper lot.
They will be approximately 200 foot runs on the laterals feeding into an approximately 300-400 ft run main.
Do the French drains need to be below the frost line which is apparently 50 inches deep here? Was going to use solid walled plastic piping with perforations on bottom
Property doesnít need to drain if itís frozen obviously
Have read on some sites about freeze thaw
Damaging some drain pipes
Below frost line will add significantly more trenching hours - i was already planning a 2 ft wide trench with 6 inch pipe
At lower end of the project ie lower elevation Iíd probably be digging deeper than the adjacent waterfront water table