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Evaluating the Thiessen polygon approach for efficient parameterization of urban stormwater models

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Abstract

Catchment discretization plays a key role in constructing stormwater models. Traditional methods usually require aerial or topographic data to manually partition the catchment, but this approach is challenging in areas with poor data access. Here, we propose an alternative approach, by drawing Thiessen polygons around sewer nodes to construct a sewershed model. The utility of this approach is evaluated using the EPA’s Storm Water Management Model (SWMM) to simulate pipe flow in a sewershed in the City of Pittsburgh. Parameter sensitivities and model uncertainties were explored via Monte Carlo simulations and a simple algorithm applied to calibrate the model. The calibrated model could reliably simulate pipe flow, with a Nash–Sutcliffe efficiency (NSE) of 0.82 when compared to measured flow. The potential influence of sewer data availability on model performance was tested as a function of the number of nodes used to build the model. No statistical differences were observed in model performance when randomly reducing the number of nodes used to build the model (up to 40%). Based on our analyses, the Thiessen polygon approach can be used to construct urban stormwater models and generate good pipe flow simulations even for sewer data limited scenarios.

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Data availability

The simplified sewer network and model parameterization is available from the authors on request.

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Acknowledgements

We thank the Allegheny County Sanitary Authority and Pittsburgh Water & Sewer Authority for graciously providing sewer flow data and field data.

Funding

This work was supported by the National Science Foundation, USA (NSF grant number 1854827).

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Authors

Contributions

Zhaokai Dong contributed to the investigation, methodology, validation, visualization, software, and wrote the original draft. Dr. Daniel Bain contributed to the methodology, resources, review, and editing. Dr. Murat Akcakaya contributed to the funding acquisition, methodology, review, and editing. Dr. Carla Ng contributed to the funding acquisition, methodology, project administration, resources, supervision, review, and editing.

Corresponding author

Correspondence to Carla A. Ng.

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The authors declare no competing interests.

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Dong, Z., Bain, D.J., Akcakaya, M. et al. Evaluating the Thiessen polygon approach for efficient parameterization of urban stormwater models. Environ Sci Pollut Res 30, 30295–30307 (2023). https://doi.org/10.1007/s11356-022-24162-7

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  • DOI: https://doi.org/10.1007/s11356-022-24162-7

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