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Regrading is the process of grading for raising and/or lowering the levels of land. Such a project can also be referred to as a regrade. Regrading may be done on a small scale (as in preparation of a house site)〔(Trees and Home Construction: Minimizing the impact of construction activity on trees ), University of Ohio Extension Bulletin 870-99. Accessed online 16 October 2007.〕 or on quite a large scale (as in major reconfiguration of the terrain of a city, such as the Denny Regrade in Seattle).〔 Regrading is typically performed to make land more level (flatter), in which case it is sometimes called levelling.〔"Montana, McLaren Tailings", p.35 in (CERCLA Imminent Hazard Mining and Mineral Processing Facilities ), Office of Solid Waste, U.S. Environmental Protection Agency, February 1997. Accessed online 16 October 2007.〕) Levelling can have the consequence of making other nearby slopes steeper, and potentially unstable or prone to erosion. ==Purposes== Reasons for regrading include: * Enabling construction on lands that were previously too varied and/or steeply sloped.〔 * Enabling transportation along routes that were previously too varied and/or steep.〔 * Changing drainage patterns and rerouting surface flow.〔 * Improving the stability of terrain adjacent to developments.〔Malcolm Puller, ''Deep Excavations: A Practical Manual'', Thomas Telford (1996). ISBN 0-7277-1987-4. p. 63.〕 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「Regrading」の詳細全文を読む スポンサード リンク
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