R. Malmur, M. Mrowiec
Czestochowa University of Technology, Faculty of Infrastructure and Environment, Institute of Environmental Engineering, Częstochowa, PL


With frequent heavy rainfalls in summer in Poland and fast-melting snow after winter that cause flooding of sewage systems (through excessively high filling levels of water receivers or through difficulties in temporary retention of the excess stormwater), a variety of systems are designed in order to transfer stormwater to water receivers. Outflow of the excess stormwater is usually ensured by gravitational methods using outflow collectors that connect stormwater drains with waterways. This transfer occurs during intensive precipitation, when the excess wastewater overflows through stormwater drains and is transferred directly to water receivers in order to relieve wastewater treatment plants or to prevent from using excessively high diameters of sewers. These systems are useful wherever the filling levels in waterways are not very high or the sewerage system is located relatively high compared to the water receiver: outflow collector is located on a steep slope. In this case, the stormwater that flows through a waterway cannot be returned to the outflow collector. A reverse situation is observed when gravitational outflow is impossible e.g. due to the excessive filling level of water receiver: stormwater can be transferred by means of a variety of retention/transfer reservoirs, which represent modern solutions. These reservoirs are supposed to ensure partial retention of the excess stormwater and transfer of this water to water receivers, either gravitationally or forced, depending on the filling state in the waterway. Furthermore, these reservoirs prevent wastewater from being returned to the system during suddenly rising levels. One of these solutions is a reservoir presented in this paper.

Keywords: drainage system, retention, sewage, sewage reservoirs, transfer reservoirs