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COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- PHYSICAL MODELLING OF THE JIRKOV DAM BELL-MOUTH SPILLWAY Jan SVEJKOVSKÝ Head of the Department of Dam Monitoring and Safety, POVODÍ OHŘE, STATE ENTERPRISE CZECH REPUBLIC Martin KRUPKA Department of Water Management Development, POVODÍ OHŘE, STATE ENTERPRISE CZECH REPUBLIC 1. INTRODUCTION Bell-mouth spillways are not a common type of spillways in the Czech Republic. One of the oldest bell-mouth spillways is situated at the Jirkov Dam (Fig. 1). When compared to other spillways of this type, an unusuall solution was used for the intake and the circular bottom end of the vertical shaft. The physical model was built in order to clarify the hydraulic conditions during flood flows. 1078