A bioswale* is a vegetated, linear and low sloped pit often established in urban areas near/between roads with the objective to reduce flood risk during or after heavy rain events. The intention of bioswales is comparable to rain gardens. Bioswales absorb, store and convey surface water runoff (mainly draining from roadways) and also remove pollutants and sediments, when the water trickles through the vegetation and soil layer. The choice of vegetation for bioswales is variable but deep-rooted native plants are common and preferred. To support infiltration of water runoff, some swales are equipped with dams or similar constructions. Bioswales are not limited to a certain region/country. If properly planned and planted with native plants, a bioswale is a reasonable contribution to local storm water management and control.
* In literature refers to as swale (source: http://nwrm.eu/sites/default/files/nwrm_ressources/u4_-_swales.pdf)
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