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An arch dam is a solid dam made of concrete that is curved upstream in plan.〔 The arch dam is designed so that the force of the water against it, known as hydrostatic pressure, presses against the arch, compressing and strengthening the structure as it pushes into its foundation or abutments. An arch dam is most suitable for narrow gorges or canyons with steep walls of stable rock to support the structure and stresses. Since they are thinner than any other dam type, they require much less construction material, making them economical and practical in remote areas. ==Classification== In general, arch dams are classified based on the ratio of the base thickness to the structural height (b/h) as:〔 * Thin, for b/h less than 0.2, * Medium-thick, for b/h between 0.2 and 0.3, and * Thick, for b/h ratio over 0.3. Arch dams classified with respect to their structural height are:〔 * Low dams up to 100 feet, * Medium high dams between 100– 300 feet, * High dams over 300 feet. 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「arch dam」の詳細全文を読む スポンサード リンク
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