Overflowing and flooding in rainwater and sewer system manholes have become very common incidents in recent years. It is a well-known fact that floods spread out to large areas and cause loss of life and property. Consequently, using recent modelling approaches in the design of manholes has gained more importance than ever. The manhole geometry used today is given by national standards. Although the flood of a manhole is typically considered as a result of insufficient capacity of the system, the manhole geometry has distinctive role on the energy loss coefficients of manhole and water level in it. Nowadays, Computational Fluid Dynamic (CFD) programs and large computer capacity present opportunities in accurately modeling water flows in the manholes whose loss coefficients are calculated from the CFD modelling.In this study, water flow is modelled with CFD in a typical half bench manhole given by the Turkish Standards TS EN1917/AC. Moreover, three alternative manholes geometries are generated and water flow in these manholes are modelled with CFD. The energy loos coefficients of all manhole models are calculated and compared.
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