Drainage
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- Process of removing surface or subsurface water from a soil or area. A technique to improve the productivity of some agricultural land by removing excess water from the soil; surface drainage is accomplished with open ditches; subsurface drainage uses porous conduits (drain tile) buried beneath the soil surface.
Bureau of Reclamation - Cite This Source - This Definition - Agricultural drainage, Drainage system, Gray water, Hydrography, Hydrologic unit code, Internal drainage