Two-dimensional (2D) flood analysis and calibration of stormwater drainage systems using geographic information systems

Abstract

In recent years, there has been severe flooding in urban areas as well as coastal and river flooding. Urban flooding is exacerbated by climate change, urbanization, growing population, and the increase of impervious surfaces in urban areas. Stormwater drainage systems that discharge stormwater to a safe location in urban areas are becoming increasingly important. The objective of this study is to analyze and calibrate the flood performance of stormwater drainage systems currently used in the central region of Malatya in a potential flood situation using geographic information systems and the InfoWorks ICM. The model was created using the land use type, buildings, and digital elevation model (DEM), and the analysis was performed by exposing stormwater drainage systems to rainfall events of 5, 10, and 15 min of duration for return periods of 2, 5, and 10 years. The model was then validated using field-observed rainfall and flood data and its performance was evaluated using R2, NSE, RMSE, and MAE metrics. The results showed that the eight stormwater drainage systems currently in operation cannot fully convey stormwater and may pose a risk of loss of life and property in residential areas. In addition, the severity of the flooding was found to increase with an increasing return period. HIGHLIGHTS Analysis based on the hydrodynamic model was performed.; Data that could increase the risk of urban flooding were included in the model.; The analysis of urban flooding was performed using the InfoWorks ICM model.; The model was calibrated by considering field data.; The performance of stormwater drainage systems was evaluated.;

Keywords

• flood analysis
• flood inundation maps
• hydrodynamic modeling
• infoworks icm model
• stormwater drainage systems
• urban flood