University of Tabriz Journal of Civil and Environmental Engineering 2008-7918 53 112 2023 11 22 Evaluation Effect of Changing the Sill Geometries and Positions on Discharge Coefficient of Vertical Sluice Gate Evaluation Effect of Changing the Sill Geometries and Positions on Discharge Coefficient of Vertical Sluice Gate 117 127 15368 10.22034/jcee.2022.52525.2167 FA Rasoul Daneshfaraz Faculty of Engineering, University of Maragheh, Maragheh, Iran Reza Norouzi Faculty of Engineering, University of Maragheh, Maragheh, Iran Parisa Ebadzadeh Faculty of Engineering, University of Maragheh, Maragheh, Iran Journal Article 2022 07 15 In controlling water resources, sluice gates have received attention from researchers due to the ease of installation and simplicity of the operation and the governing equations. The experimental study of (Henry, 1950) is one of the first research publications in this field that estimated the flow discharge coefficient for the sluice gate with a diagram. The studies of (Alhamid, 1999), Rajaratnam and Subramanian (1967), Ferro (2000), Daneshfaraz et al. (2016) and Heidari et al. (2020) are other studies in the field of hydraulics of sluice gate, that explains the importance of research in this field. In the present paper,<em> </em>results of experimental investigations on the effect of applying sill on discharge coefficient in different positions of the sluice gate are presented. The effect of sills including semi-cylindrical, cylindrical, pyramidal and rectangular cube in different widths was investigated. In controlling water resources, sluice gates have received attention from researchers due to the ease of installation and simplicity of the operation and the governing equations. The experimental study of (Henry, 1950) is one of the first research publications in this field that estimated the flow discharge coefficient for the sluice gate with a diagram. The studies of (Alhamid, 1999), Rajaratnam and Subramanian (1967), Ferro (2000), Daneshfaraz et al. (2016) and Heidari et al. (2020) are other studies in the field of hydraulics of sluice gate, that explains the importance of research in this field. In the present paper,<em> </em>results of experimental investigations on the effect of applying sill on discharge coefficient in different positions of the sluice gate are presented. The effect of sills including semi-cylindrical, cylindrical, pyramidal and rectangular cube in different widths was investigated. https://ceej.tabrizu.ac.ir/article_15368_6a0beebbbc0e26ce3268c2a7e3edbdbd.pdf