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Opimination of stormwater management using conventional (structural) and operational (control) measures - A comparative case study in Belgium
Art der Abschlussarbeit
Master
Autoren
- Opwonya, Daniel
Betreuer
- Prof. Dr. sc. techn. Peter Krebs
- Dr.-Ing. Jens Tränckner
- Dr.-Ing. Frank Blumensaat
Abstract
"Combined sewer overflows (CSOs) cause hydraulic and pollutant stress on the receiving water body and thus a burden for compliance with EU Water Framework Directive (WFD) whereas sewer failure could lead to urban flooding and therefore damage property and in situations of poor sanitation, cause health problems. Therefore integrated modelling of the sewer system can enhance performance.
The task of this study was accomplished by the development of structural and operational
optimisation strategies for urban stormwater management using the sewer network of Kessel-Lo catchment in Belgium as the case study. A hydrodynamic sewer model built on different applications (EPA SWMM, SIMBA and INFOWORKS) was used to develop, implement and compare these strategies using a multi-criteria analysis of different performance indicators such as total spill volume, maximum overflow rate, spill frequency and sewer flooding. Further more a rainfall event based analysis was carried out to ascertain the most relevant performance indicators. The results should a broad range (2% to 65%) of effectiveness at reducing the performance indicators but overall, Real Time Control (RTC) was the best optimisation strategy at reducing total spill volume and spill frequency while addition of storage capacity was the most effective at reducing maximum overflow rate. Throttle flow adjustment had moderate effects on all the indicators while connection of a new subcatchment to the sewer network was the worst management practice envisaged. Finally total spill volume and maximum overflow rate proved to be the most relevant performance indicators. The report explores the relevance of the study to other catchments especially those in developing countries and the potential to improve these strategies."
The task of this study was accomplished by the development of structural and operational
optimisation strategies for urban stormwater management using the sewer network of Kessel-Lo catchment in Belgium as the case study. A hydrodynamic sewer model built on different applications (EPA SWMM, SIMBA and INFOWORKS) was used to develop, implement and compare these strategies using a multi-criteria analysis of different performance indicators such as total spill volume, maximum overflow rate, spill frequency and sewer flooding. Further more a rainfall event based analysis was carried out to ascertain the most relevant performance indicators. The results should a broad range (2% to 65%) of effectiveness at reducing the performance indicators but overall, Real Time Control (RTC) was the best optimisation strategy at reducing total spill volume and spill frequency while addition of storage capacity was the most effective at reducing maximum overflow rate. Throttle flow adjustment had moderate effects on all the indicators while connection of a new subcatchment to the sewer network was the worst management practice envisaged. Finally total spill volume and maximum overflow rate proved to be the most relevant performance indicators. The report explores the relevance of the study to other catchments especially those in developing countries and the potential to improve these strategies."
Schlagwörter
system performance, integrated modelling, Combined sewer overflow, optimisation, Urban Stormwater management, Real Time Control, throttle flow, hydrodynamic, sewer flooding, performance indicators
Berichtsjahr
2008