Urban flood vulnerability assessment of Vadodara city using rainfall–run-off simula­tions

Abstract

In this study, we demonstrate an approach for citywide urban flood vulnerability assessment based on the capability of storm-water drainage network. The daily rainfall data of 45 years was used for generating Intensity Duration Frequency (IDF) curves of 2, 5, 10, 50 and 100 year return period. The performance of the storm-water drainage network was subsequently evaluated for each of these probable storms using rainfall-runoff simulations in US-EPA's SWMM software. The duration of flooding at drainage nodes under storms of different return period was considered for identifying flood-prone regions in the city. It was observed that about 21% of the city is currently under high and very high urban flood severity zones.