定義
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). (Source: GEMET - MGH / WHIT)
階層
Broader: Concepts
Concept URI: http://www.informea.org/terms/drainage
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