As title, we have a recent patio that extends to about 4m from eaves, and is about 7m wide, there is a patch of level lawn carrying on about 3 m beyond the patio edge. the ground falls away on three sides of the lawn section, will be rockery there. The lawn was a bit soggy over the winter, so I want to put perforated drain under the edge of lawn, there is a soakaway under the lawn, crazy deep when I saw it being fitted, but the guttering drain runs close by on its way to the soakaway, I intend to join into that drain.
So how deep should I put the perf drain pipe?
So how deep should I put the perf drain pipe?