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drainage district
Drainage districts occur in England and Wales, varying in size from a few hundred acres to over , all in low lying areas of the country where flood risk management and land drainage are sensitive issues. Most drainage districts are administered by an internal drainage board (IDB), which are single purpose local drainage authorities, dealing with the drainage and water level management of clean water only.〔(What is an internal drainage board? section of the Black Sluice IDB website )〕 Each drainage district has a defined area, and the IDB only has powers to deal with matters affecting that area.
==British Isles==
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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