Urban Flood Modelling of West Zone of Surat City, India

Urbanization has expanded the use of impermeable surfaces, posing issues in dealing with the consequences of climatic changes, such as heavy amounts of precipitation and severity, making cities more vulnerable to urban floods. The study investigates the adequacy of the prevailing storm water drainage network of west zone of Surat city, Gujarat, India. The present study aims to the development of the intensity–duration–frequency curve, rainfall-runoff model, and 1D hydrodynamic model in MIKE+ using the existing topographic and storm water network data of west zone of Surat city. The developed model was used to simulate 2-year and 5-year return period rainfall event in order to determine the maximum discharge at the outlets using the time-area approach. The findings of the study revealed that the current storm water network in west zone of Surat city is insufficient to seamlessly divert the discharge produced by a 5-year return period, 2-h duration rainfall event, necessitating the augmentation of the current network of the west zone, Surat city in the future.