How do land drains work? Land drains work by allowing water to flow into a pipe in waterlogged areas. When soil is saturated either due to the type of soil or how much rainfall there is, no more water can be absorbed so the ground becomes waterlogged.

How deep do you put land drains?

It should be deep enough to allow for 100mm of clean bedding (ideally fine gravel with stones no larger than 10mm) on which the pipe should be laid, then 150mm of standard 20mm shingle above the pipe.

What does a land drain do?

Perforated land drain is used to collect water through the small holes located around the pipe; these holes allow water to seep from the ground into the pipe and be carried away or to percolate back into the soil at a practical rate. … Land drain should only be used for surface water drainage, never for foul water.