Plenary 12: In-Sewer Processes 3 - Sediments
8:50am - 9:10am
Improving sediment monitoring strategies based on SWMM-HEAT and temperature sensors
1Eawag, Swiss Federal Institute of Aquatic Science and Technology; 2Universidade da Coruña
9:10am - 9:30am
Validation of sediment transport models in a stormwater network using high-resolution turbidity data
1Helmholtz-Centre of Environmental Research – UFZ, Germany; 2Technische Universität Dresden, Institute of Urban Water Management; 3ifak e. V. Magdeburg, Department Water and Energy
Predicting sediment transport at urban catchment scale is a challenge. In this study we aimed to validated a new simplified approach to simulate sediment transport in a stormwater network. We used turbidity and discharge data measured at the outlet of a small urban catchment in Dresden, Germany. The high-resolution data was useful for calibration and validation of the couple model developed using the new approach. The representation of the mobilisation of sediments in the stormwater network was significantly improved. This simplified approach allows a more accurate prediction of the total transported mass of sediments during a rainfall event.
9:30am - 9:50am
First flush assumptions in pollution management for separate stormwater systems: debunking a classical urban (drainage) myth
1Technical University of Denmark, Denmark; 2Chinese Academy of Sciences, China; 3Sino-Danish Center for Education and Research, Denmark & China; 4Institut National des Sciences Appliquées, France; 5University of applied Sciences of Western Switzerland, Switzerland
We reviewed the various definitions of First Flush (FF) investigated in the last half century.
We applied the different FF definitions to a high-resolution dataset of 363 events.
We showed that First Flush is observed in only a minor fraction of the observed events, highlighting the environmental risks using the FF concept for pollution control.
9:50am - 10:10am
New approach for condition-based sewer inspection combined with demand-based sewer cleaning assisted through innovative tools
1University of Natural Resources and Life Sciences, Vienna, Austria; 2AEP Consulting ZT GmbH, Achau, Austria; 3University of Applied Sciences, Aachen, Germany
In Austria and Germany many sewer operators want to turn from mandatory interval-based cleaning and inspection to demand-based cleaning and condition-based inspection strategies. This requires new tools and technologies. So-called manhole-zoom cameras have been developed for a quick view into sewers. The novel aspect of that approach is the combination of a demand-based cleaning strategy with a condition-based inspection strategy by using alternative inspection tools. To conclude the new approach is promising for optimization of operational issues in sewer management and should be implemented in sewer utilities.