DRAINAGE AND LAND RECLAMATION Drainage is necessary to remove excess water from the soil as well as to improve soil porosity and aeration. Soil acidity is reduced by drainage.
Drainage may be carried out by a network of pipes, open drains and ditches. Low-lying areas bordering the sea have been reclaimed by employing drainage techniques in the Netherlands and the fens of Britain. Dykes and sea-walls are constructed to keep out the water, and water remaining in the enclosed land is pumped out by pumps (windmills were used in the past). The polders of the Netherlands are reclaimed farmland.
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