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- 1) Removal of groundwater or surface water, or of water from structures, by gravity or pumping.
2) The discharge of water from a soil by percolation (the process by which surface water moves downwards through cracks, joints and pores in soil and rocks).
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| Abstract from DBPedia | Drainage is the natural or artificial removal of a surface's water and sub-surface water from an area with excess of water. The internal drainage of most agricultural soils is good enough to prevent severe waterlogging (anaerobic conditions that harm root growth), but many soils need artificial drainage to improve production or to manage water supplies.排水（はいすい）は、生活や産業活動に支障を及ぼす過剰な水がある場所から、地表の水もしくは地下水を自然にまたは人為的に除去すること。 排水手法は、排水設備を参照船舶の排水量は、排水量を参照 (Source: http://dbpedia.org/resource/Drainage) |
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