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grassed waterway
A grassed waterway consists in a to 48-metre-wide (157 ft) native grassland strip of green belt. It is generally installed in the thalweg, the deepest continuous line along a valley or watercourse, of a cultivated dry valley in order to control erosion. A study carried out on a grassed waterway during 8 years in Bavaria showed that it can lead to several other types of positive impacts, e.g. on biodiversity.〔Fiener P., Auerswald K. (2003). Concept and effects of a multi-purpose grassed waterway. Soil Use and Management 19, 65-72.〕
==Distinctions==
Confusion between "grassed waterways" and "vegetative filter strips" should be avoided. The latter are generally narrower (only a few metres wide) and rather installed along rivers as well as along or within cultivated fields. However, buffer strip can be a synonym, with shrubs and trees added to the plant component, as does a riparian zone.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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