Modelling Infiltration Process, Overland Flow and Sewer System Interactions for Urban Flood Mitigation

Rainfall-runoff transformation on urban catchments involves physical processes governing runoff production in areas (e.g., interception, evaporation, depression, infiltration). Some previous 1D/2D coupled models do not include these processes. Adequate representation of rainfall–runoff–infiltration within a dual drainage model is still needed for practical applications. In this paper we propose new modelling setup which includes the process overland flow and its interaction with sewer network. We first investigated performance an outflow hydrograph generator 2D domain. The effect infiltration losses was evaluated through algorithm added so-called Surf-2D model. Then, surface from surcharge also by coupling SWMM 5.1 (Storm Water Management Model). An evaluation two approaches representing floods carried out based interactions. Two test cases were implemented to validate general, similar results terms peak discharge, water depths against other observed. interactions show significant differences flood extent, maximum inundation volume.