International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(5033) Drainage
1 - The removal of excess surface and groundwater from any area. May occur naturally or by virtue of man-made surface or subsurface conduits; also a system of such conduits. 2 - The mode or manner in which surface waters find their way into streams and rivers. 3 - The natural lines of depressions in an area through which storm water escapes to rivers and streams. 4 - The percolation of soil water below the root zone. 5 - An expression of the ease with which excess water can flow naturally from a soil or land surface, as `well drained` or `poorly drained`.

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