Drainage benefits the land
The objective of any form of land drainage is to lower the water-table. This promotes deeper rooting, which improves sward productivity. It also improves the load-bearing capacity of the soil and lessens the damage caused by grazing and machinery.
The potential of the land to be drained should be assessed first, to determine if the costs incurred will result in an economic return through additional yield and utilisation of the grass or other crops.