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Sanitary sewage network is relatively rarely considered as the cause of urban floods. Its hydraulic overload can result not
only in flooding, but also sanitary contamination of subcatchments. Stormwater is the main reason for this overload. In contrast
to the stormwater or combined sewer system, these waters infiltrate into the network in an uncontrolled way, through
ventilation holes of covers or structural faults and lack of tightness of manholes. Part of stormwater infiltrates into the soil,
where it leaks into pipelines. This greatly hinders assessing the quantity of stormwater influent into the sanitary sewer system.
Standard methods of finding correlation between rainfall and the intensity of stormwater flow are ineffective. This is
confirmed, i.a. by the studies performed in an existing network, presented in this paper. Only when residuals analysis was
performed using the ARIMA and ARIMAX methods, the authors were able to develop a mathematical model enabling to
assess the influence of rainfall depth on the stormwater effluent from the sewage network. Owing to the possibility of using
the rainfall depth forecasts, the developed mathematical model enables to prepare the local water and sewerage companies
for the occurrence of urban floods as well as hydraulic overload of wastewater treatment plants.
