Wiktionary英語版

出典:Wiktionary

bioretention

語源

bio- +‎ retention

名詞

bioretention (countable かつ uncountable, 複数形 bioretentions)

  1. retention (removal) of groundwater contaminants
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ウィキペディア英語版

出典:Wikipedia

Bioretention

出典:『Wikipedia』 (2011/06/08 18:21 UTC 版)

英語による解説

ウィキペディア英語版からの引用
引用

Bioretention is the process in which contaminants and sedimentation are removed from stormwater runoff. Stormwater is collected into the treatment area which consists of a grass buffer strip, sand bed, ponding area, organic layer or mulch layer, planting soil, and plants. Runoff passes first over or through a sand bed, which slows the runoff's velocity, distributes it evenly along the length of the ponding area, which consists of a surface organic layer and/or groundcover and the underlying planting soil. The ponding area is graded, its center depressed. Water is ponded to a depth of 15 cm (5.9 in) and gradually infiltrates the bioretention area or is evapotranspired. The bioretention area is graded to divert excess runoff away from itself. Stored water in the bioretention area planting soil exfiltrates over a period of days into the underlying soils.

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