Exchange between drainage systems and surface flows during urban flooding: Quasi-steady and dynamic modelling in unsteady flow conditions

•Development of a quasi-steady and a dynamic model for urban drainage.•The developed models take into account explicitly local head losses.•The developed models perform well in unsteady flow conditions.•The developed models perform better than the typical weir/orifice approach.•The dynamic model estimates the evolution of the water level in a manhole.