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STUDY ON EVALUATION OF DISCHARGE OVER SIDE WEIRS

Akira Murota, Teruyuki FUKUHARA, Yoshihiro SUKITA

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Abstract

In this study, it was tried to evaluate a weir discharge by using of weir height and length, and water depth and velocity under the condition of flows along non-side weir channels. A proposed weir discharge equation is expressed as Qs=Cw√2g(Δh)1.5L, in which Qs is side weir discharge, Cw a discharge coefficient, L weir length and Δh, specific energy of flows over side weirs. Cw is domained by L and Froud number of flows along non-side weir channels. A proposed equation can be applied to a subcritical flow in a fully long uniform channel on a mild slope. As a result, the errors between values by experimental formula and ones by experiments were within ±8%.

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What this paper is about

In this study, it was tried to evaluate a weir discharge by using of weir height and length, and water depth and velocity under the condition of flows along non-side weir channels. A proposed weir discharge equation is expressed as Qs=Cw√2g(Δh)1.5L, in which Qs is side weir discharge, Cw a discharge coefficient, L weir length and Δh, specific energy of flows over side weirs. Cw is domained by L and Froud number of flows along non-side weir channels. A proposed equation can be applied to a subcritical flow in a fully long uniform channel on a mild slope. As a result, the errors between values by experimental formula and ones by experiments were within ±8%.

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Available abstract

In this study, it was tried to evaluate a weir discharge by using of weir height and length, and water depth and velocity under the condition of flows along non-side weir channels. A proposed weir discharge equation is expressed as Qs=Cw√2g(Δh)1.5L, in which Qs is side weir discharge, Cw a discharge coefficient, L weir length and Δh, specific energy of flows over side weirs. Cw is domained by L and Froud number of flows along non-side weir channels. A proposed equation can be applied to a subcritical flow in a fully long uniform channel on a mild slope. As a result, the errors between values by experimental formula and ones by experiments were within ±8%.

Key concepts: Weir, Discharge coefficient, Water discharge, Mechanics, Flow (mathematics), Hydrology (agriculture), Geotechnical engineering, Geology

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