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Assessing the efficiency of different CSO positions based on network graph characteristics
R Sitzenfrei1, C Urich, M Möderl
1Unit of Environmental Engineering, University of Innsbruck, Technikerstr. 13, 6020 Innsbruck, Austria. robert.sitzenfrei@uibk.ac.at
Summary
Placing combined sewer overflows (CSOs) downstream in urban drainage systems increases construction costs and CSO efficiency. Upstream CSO placement improves flooding efficiency, highlighting a trade-off for system design.
Area of Science:
- Environmental Engineering
- Urban Planning
- Hydraulic Engineering
Background:
- Urban drainage system design involves spatial layout and pipe-sizing.
- Combined sewer overflow (CSO) and storage unit placement is critical for performance and cost.
- Topological characteristics significantly influence CSO placement decisions.
Purpose of the Study:
- To establish general, case-unspecific rules for CSO and storage unit placement.
- To investigate the impact of placement choices on pipe-sizing, costs, and technical performance.
- To analyze the influence of topological positions on urban drainage system design.
Main Methods:
- Stochastic generation of 2,000 virtual alpine combined sewer systems.
- Utilizing graph characteristics to describe topological positions of CSOs and storage units.
- Evaluating the impact on pipe-sizing, construction costs, CSO efficiency, and flooding.
Main Results:
- Downstream CSO placement correlates with higher construction costs and improved CSO efficiency.
- No significant cost increase was observed at specific topological network positions.
- Upstream CSO placement enhances flooding efficiency, indicating a performance trade-off.
Conclusions:
- CSO and flooding efficiency present a trade-off, necessitating a compromise in design.
- Topological network analysis is crucial for optimizing urban drainage system design.
- Placement strategies for CSOs significantly affect both economic and environmental performance.
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