With the construction and putting into operation of the central storage channel of the city of Graz, the load in the influent of the wastewater treatment plant Graz will also change significantly. In addition to the increase in inflow volumes and loads already observed in recent years, which is due to the continuous population growth of the city of Graz, the storage operation of the central storage channel together with the corresponding emptying strategies during and after rain events will lead to an increased combined sewage fraction in the inflow of the WWTP Graz. With the current status of the hydrodynamic model of the city of Graz, a model basis for the evaluation of future inflow volumes and loads to the wastewater treatment plant Graz is available. For this the existing model has to be extended by the final state of the central storage channel including all connections of the existing combined sewer overflows and by a water quality model. For a realistic assessment, suitable, spatially heterogeneous rainfall time series have to be derived for the urban area based on the Cooperative Measuring Network Graz. Finally, fractional inflow pollutographs for the wastewater treatment plant Graz are required as model result in order to be able to calculate corresponding load scenarios for the actual and extended state of the wastewater treatment plant Graz by means of the existing or also a future dynamic model of the wastewater treatment plant Graz.
|Effective start/end date||1/09/20 → 31/01/21|