<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Full-width sharp-edged broad-crested rectangular weirs in the range 0.1 &lt; <italic>h</italic>/<italic>L</italic> ≤ 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.</p></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.

Submergence coefficient of full-width sharp-edged broad-crested rectangular weirs

Faculty of Civil Engineering, Institute of Water Structures

Slovak University of Technology in Bratislava

Faculty of Civil Engineering, Department of Hydraulic Engineering

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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...

Submergence coefficient of full-width sharp-edged broad-crested rectangular weirs

Published Online: Nov 15, 2019

Page range: 329 - 338

Received: Jun 11, 2018

Accepted: Jul 12, 2019

DOI: https://doi.org/10.2478/johh-2019-0022

Keywords
Modular limit, Relative weir height, Full-width sharp-edged broad-crested weir, Submergence coefficient

© 2019 Zbyněk Zachoval et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Submergence coefficient of full-width sharp-edged broad-crested rectangular weirs

Published Online: Nov 15, 2019

Page range: 329 - 338

Received: Jun 11, 2018

Accepted: Jul 12, 2019

DOI: https://doi.org/10.2478/johh-2019-0022

KeywordsModular limit, Relative weir height, Full-width sharp-edged broad-crested weir, Submergence coefficient

© 2019 Zbyněk Zachoval et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Modular limit, Relative weir height, Full-width sharp-edged broad-crested weir, Submergence coefficient