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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Urban runoff ： ウィキペディア英語版 Urban runoff Urban runoff is surface runoff of rainwater created by urbanization. This runoff is a major source of urban flooding and water pollution in urban communities worldwide. ==Overview== Impervious surfaces (roads, parking lots and sidewalks) are constructed during land development. During rain storms and other precipitation events, these surfaces (built from materials such as asphalt and concrete), along with rooftops, carry polluted stormwater to storm drains, instead of allowing the water to percolate through soil. This causes lowering of the water table (because groundwater recharge is lessened) and flooding since the amount of water that remains on the surface is greater.〔(Water Environment Federation ), Alexandria, VA; and (American Society of Civil Engineers ), Reston, VA. ("Urban Runoff Quality Management." ) WEF Manual of Practice No. 23; ASCE Manual and Report on Engineering Practice No. 87. 1998. ISBN 1-57278-039-8. Chapter 1.〕 Most municipal storm sewer systems discharge stormwater, untreated, to streams, rivers and bays. This excess water can also make its way into people's properties through basement backups and seepage through building wall and floors. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Urban runoff」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.