Improper envelope material or application, that is, poor placement, tearing of envelope material, sealing of envelope with soil or ochre. Collapse of drain pipe because of excess surface load, weak pipe or improper backfilling methods. Plugging of pipe by organic wastes, and roots. Certain types of plastic may be adversely affected through brittleness and cracking by surfactant chemicals, therefore, milk house wastes should not be permitted to enter a corrugated plastic tubing. Drain problems can be confirmed through simultaneously observing the drain discharge and the height of the water table between drains.
Some soils have a greater tendency toward sedimentation than others.
Soils of uniform grain size are unable to form a natural soil filter. These soils have been identified as very fine sands, loamy fine sands, fine sands and silts as well as some organic soils. Such soils are unstable when saturated and will flow into the drain pipe or seal and block the entry of water into the pipe. All soils with structural instability create low soil permeability. The upward force of water entering a drain pipe may exceed the buoyant soil particle weight and result in instability and soil movement unless natural bridging occurs.