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Drainage
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<p>Drainage is the natural or artificial removal of a surface's water and <a href="/facts/Groundwater/JYM2IDS2">sub-surface water</a> from an area with excess water. The internal drainage of most <a href="/facts/Agricultural/TGztqzJs">agricultural</a> soils can prevent severe <a href="/facts/Waterlogging_(agriculture)/t46n5bue">waterlogging</a> (anaerobic conditions that harm root growth), but many <a href="/facts/Soil/5Ddpr3QM">soils</a> need artificial drainage to improve production or to manage water supplies. </p>