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Urban stormwater inundation simulation based on SWMM and diffusive overland-flow model
Wenjie Chen1, Guoru Huang2, Han Zhang1
1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China.
Summary
This study presents a simplified urban stormwater inundation model combining SWMM and GIS to simulate flooding. The model accurately predicts inundation extents and depths, aiding in property loss reduction.
Area of Science:
- Environmental Engineering
- Urban Hydrology
- Geographic Information Systems
Background:
- Rapid urbanization exacerbates property losses due to severe urban inundation.
- Effective urban inundation modeling is crucial for mitigating these economic and social impacts.
Purpose of the Study:
- To introduce a simplified urban stormwater inundation simulation model.
- To assess the model's capability in predicting inundation extents and depths in large urban areas.
Main Methods:
- The model integrates the Storm Water Management Model (SWMM) for sewer and junction flows with a GIS-based diffusive overland-flow model for surface runoff and inundation.
- Model calibration and validation were performed using observed rainfall scenarios on Haidian Island, China.
Main Results:
- The model successfully simulated surface runoff and inundation processes.
- Comparisons with field data and InfoWorks ICM showed reasonable inundation depths and extents.
- The model proved effective even for a large study area.
Conclusions:
- The developed simplified model provides a viable tool for urban inundation simulation.
- The model's ability to predict inundation extents and depths supports urban planning and disaster risk reduction efforts.
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