Mole drainage allows heavy clay soils to be drained cost effectively with spectacular results.
Mole drainage refers to a type of drainage used on heavy soils in conjunction with a pipe and gravel backfill system. Mole drains are ploughed across the paddock and oriented to intercept the gravel filled drain lines. At a 2 metre spacing, approximately 5,000 metres per hectare of channels are created. It is these simple channels that are draining the pasture by rapidly carrying each rainfall event to the piped drainage system. See Fact Sheet #2
Mole plough consists of a round steel bar, (foot), 50mm in diameter attached to a blade that allows the foot to be towed parallel to the surface 450mm deep. Directly behind the foot is 75mm diameter tapered section, (expander), that smoothes and compacts the channel.
The mole drains, spaced 2 metres apart, collect water from the surface and empty into collector drains with gravel backfill, spaced at intervals across the paddock. Although the principal is very simple, mole drainage requires strict adherence to certain rules if they are to be used successfully and efficiently in your drainage program.