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Abstract
Combined sewer overflow (CSO) can be a critical inflow source for urban rivers during storm events. This paper presents a case study of the Chicago waterway. A three-dimensional (3D) river hydrodynamic model was developed and integrated with an urban rainfall-runoff model using the Open Modelling Interface (OpenMI). Both the effects of CSO discharge on river and river water levels on CSO outlets were considered by the integrated model. A historical storm, which was similar to a 100-year return period rain event, was simulated and compared with field measurements. This study highlights the necessity of quantifying CSO for hydraulic modelling of urban rivers under extreme storm event conditions, and shows that an integrated hydrologic and hydraulic approach can be used to address this challenge. The 3D river hydrodynamic model can deal with the complex hydrodynamics at river confluences and provide better hydrodynamic results for water quality modelling in the future.
Acknowledgements
The authors would like to thank Dr. Sumit Sinha for his help with preparing the computational meshes for the EFDC model. All members of the Tunnel and Reservoir Project (TARP) group are acknowledged for all their hard work in developing the CS-TARP model. The authors would also like to thank Dr. Charles Steve Melching for his comments which improved the manuscript. The opinions and findings presented in this paper are solely those of the authors of the manuscript and do not represent the opinions of any state and federal agencies mentioned in the manuscript.
Notes
No potential conflict of interest was reported by the authors.
Supplemental data for this article can be accessed http://dx.doi.org/10.1080/1573062X.2017.1301504..
