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Learn Principles of Agronomy — B.SC agriculture
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1) Tile drainage

The drainage is accomplished by means of a series of tiles laid in a continuous line at a specified depth and grade so that the free water entering the system will flow out by gravity. A tile drainage system consists of a drainage outlet, tile main, sub mains and laterals. The laterals remove the free water from the soil and the sub-mains carry the tile water to the drainage outlet.

2) Vertical drainage

Vertical drainage is the disposal of drainage water through wells into a porous layer of earth or an open rock formation. Such a layer formation must be capable of taking large volumes of water supply.

3) Mole drains:

 Mole drains are unlined circular earthen channels formed highly cohesive or fibrous soil by a mole plough. Mole channels are usually ranged in diameter from 7.5-10 cm. Spacing ranges from 1.5-9 m and depth from 50-75 cm. The mole plough has a long blade like shank to which attached a cylindrical bullet-nose plug known as mole. As the plough is drawn through the soil, the mole forms.

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