From an application standpoint, the drain I'm designing is a subsurface drain, used to carry water away from the structure foundation.
The water inputs are both seepage and above-ground rainwater flow due to negative grade toward structure. Using the trench-bottom bedded perforated pipe...
For the sand backfilled french drain, what should the clay soil to sand interface "look" like ?
In a disturbed soil situation, what is the relative importance of compaction of existing clay soil at the sand interface point in order to maintain the sand filtering function?
Is a geotextile...
