Abstract Full-width sharp-edged broad-crested rectangular weirs in the range 0.1 < h/L ≤ 0.3 situated in rectangular channels are frequently used in submerged flow conditions. To determine the discharge for the submerged flow, submergence coefficient and modular limit shall be known. This article deals with their determination upon a theoretic derivation and experimental research. The equation for modular limit has been determined from energy balance with simplifications. To validate it, extensive experimental research was carried out. However, the derived equation is too complicated for practical use which is why it was approximated by a simple equation applicable for the limited range. The equation for submergence coefficient was derived by modifying Villemonte’s application of the principle of superposition and its coefficients were determined using the data from experimental research of many authors. The new system of equations computes the discharge more accurately than other authors’ equations, with the error of approximately ±10% in full range of the measured data.

中文翻译：

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全宽尖边宽顶矩形堰淹没系数

摘要 位于矩形通道中的 0.1 < h/L ≤ 0.3 范围内的全宽尖边宽顶矩形堰常用于淹没流条件。要确定淹没流的流量，应知道淹没系数和模数限制。本文通过理论推导和实验研究来讨论他们的决定。模数极限方程是从能量平衡和简化中确定的。为了验证它，进行了广泛的实验研究。然而，推导出的方程对于实际应用来说过于复杂，这就是为什么它被一个适用于有限范围的简单方程近似。淹没系数的方程是通过修改Villemonte应用叠加原理而推导出来的，其系数是利用许多作者的实验研究数据确定的。新方程组比其他作者的方程更准确地计算放电，在测量数据的整个范围内误差约为±10%。