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In fluid dynamics, the Chézy formula describes the mean flow velocity of steady, turbulent open channel flow: : where * is the mean velocity (), * is the Chézy coefficient (), * is the hydraulic radius (~ water depth) (), and * is the bottom slope (). The formula is named after Antoine de Chézy, the French hydraulics engineer who devised it in 1775. ==Usage with Manning coefficient== This formula can also be used with Manning's Roughness Coefficient, instead of Chézy's coefficient. Manning derived〔Manning, R., "On the flow of Water in Open Channels and Pipes." ''Transactions Institute of Civil Engineers of Ireland, vol. 20, pp 161-209, Dublin, 1891, Supplement, vol 24, pp. 179-207, 1895〕 the following relation to C based upon experiments: : where * is the Chézy coefficient (), * is the hydraulic radius (~ water depth) (), and * is Manning's roughness coefficient. Unlike the Manning equation, which is empirical, the Chézy equation is derived from hydrodynamics theory.〔Martin & McCutcheon, 1999, Hydrodynamics and Transport, Lewis〕 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「Chézy formula」の詳細全文を読む スポンサード リンク
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