Integrated simulation of urban drainage system and receiving water body during rainfall events for both quantity and quality aspects

This work describes a mathematical model for the integrated simulation of the urban drainage system and the receivingwater body during rainfall events.The developed model, UPSIM (Maglionico, 1998), is a simplified conceptual model that schematised the sewernetworks in several sub-catchments and the river in several stretch, each one simulated with linear canals and reservoirs.For the sewer network, starting from the data recorded by the rain gauges, the model evaluates the net rainfallconsidering the hydrological losses on the catchment; the flow entering in the network through the gully pots isevaluated considering the catchment as a linear reservoir. The network is assumed to be another linear reservoir andtherefore the total outflow is evaluated.