Modelling and implementation of a modified floodgate in SWMM for simulation-based optimization of a sewer network

The discharge of combined sewer overflows (CSO) during rain events and the efficient operation of the sewer system can be a challenge for sewer network operators. Discharges into water bodies will probably have to be reduced even further in future due to new regulations. Long dry weather periods and deposits have a negative impact on the substance of sewer networks and shorten the lifetime of the infrastructure. Activating unused storage volume in the sewer can be an efficient and cost-effective alternative to building new storage volume. One possibility for predictive sewer maintenance can be the use of flushing waves from backed-up wastewater. Basically, sewer network control can utilize a lot of potential and help to overcome future challenges. This report from an application-oriented research project in the city of Jena shows the implementation and modelling of a modified floodgate in SWMM. The Results show the gained storage volume, the reduction of combined sewer discharge and flushing velocities for possible sewer flushing.