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drainage (in agriculture)

drainage, in agriculture, the removal of excess water from the soil, either by a system of surface ditches, or by underground conduits if required by soil conditions and land contour. Diesel or centrifugal pumps are sometimes used to drain large areas. Drainage was practiced in the Nile basin c.400 BC and in ancient Rome. Today drain pipes of clay, concrete, or plastic, laid several feet underground, are much used in the United States, where c.110 million farm acres (44.5 million hectares) were artificially drained in 1987. Proper drainage improves soil structure; increases efficiency of phosphorus fertilizer; conserves soil nitrogen; and controls waterlogging, leaching, and salinization of soils caused by irrigation.

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drainage

drainage
1. The passage of water over and through the land surface, ultimately towards the sea. See dendritic drainage; deranged drainage; discordant drainage; drainage density; drainage pattern; inconsequent drainage; and superimposed drainage.

2. The process of removing the gravitational water from soil, using artificial or natural conditions, such that freely moving water can drain, under gravity, through or off soil. See mole drain and tile drain.

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drainage

drainage
1. The passage of water over and through the land surface, ultimately towards the sea. See DENDRITIC DRAINAGE; DERANGED DRAINAGE; DISCORDANT DRAINAGE; DRAINAGE DENSITY; DRAINAGE PATTERN; INCONSEQUENT DRAINAGE; and SUPERIMPOSED DRAINAGE.

2. Process of removing the gravitational water from soil, using artificial or natural conditions, such that freely moving water can drain, under gravity, through or off soil. See MOLE DRAIN; and TILE DRAIN.

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drainage

drain·age / ˈdrānij/ • n. the action or process of draining something: the pot must have holes in the base for good drainage | the drainage of wetlands. ∎  the means of removing surplus water or liquid waste; a system of drains.

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drainage

drainage (drayn-ij) n. the drawing off of fluid from a cavity in the body, usually fluid that has accumulated abnormally. See also drain.

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drainage

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