A mole plough is a piece of agricultural equipment used to create underground drainage channels – called mole drains – in poorly permeable clay soils. This drainage technique is known as mole drainage. The mole plough is primarily used to dry out wet fields and pastures. The cracks it creates in the topsoil help guide excess water toward the mole drains, which helps control the water table and maintain a sufficiently dry and stable soil for supporting heavy agricultural machinery.