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In geomorphology, a drainage system is the pattern formed by the streams, rivers, and lakes in a particular watershed. They are governed by the topography of the land, whether a particular region is dominated by hard or soft rocks, and the gradient of the land. See: Drainage system (Geomorphology)'.

In agriculture, a drainage system is an intervention to control waterlogging aiming at soil improvement for agricultural production. See: Drainage system (Agriculture).

In industrial and residential areas, a drainage system is a facility to dispose of liquid waste. See: Sustainable urban drainage systems and Sewage.