MMH
Gold Member
I'm putting in a french drain that will catch water from a spring, a big hillside, and gutters from two buildings (my house and a 40x60 pole barn). There will be two curtain drains each going around the back of the buildings that will have 4" HDPE perforated pipe. These two curtains and the pipes whre the gutters from the two buildings will tee to solid 4" HDPE pipe which will run the pipe out to a creak where it will daylight drain. There will be quite a bit of drop, so gravity will help the water flow. The distance from where the curtains & gutters connect to the solid pipe down to the creak is 200' and the drop is 30'. Will a 4" pipe be able to handle this volume of water? If I go with 6" the pipe will be corregated which I don't like as much as the solid smooth pipe. It will also will be more expensive.