Abstract
The study is focused on flash flood analyses in Narendra Nagar Road under Bridge in Nagpur city, Maharashtra, India. In this paper causes of submergence of Road under Bridge is determined. Based on 304 mm and 187.4 mm rainfall, the maximum discharge rate of Narendra Nagar watershed were estimated as 49.48 m3/s and 27.69 m3/s respectively. The discharge capacity of main drain in watershed was calculated as 19.76 m3/s through field survey which is very small compared to flood discharge of watershed. In this paper, the highest flood levels (HFL) of two drains were also simulated from the year 1984 to 2017 in HEC RAS software to validate the actual conditions at the bridge site. GIS analyses is also performed to determine the flow accumulation, flow direction, Digital Elevation Map of watershed. Also the location of one bypass channel of 372.27 × 4.33 × 2.17 m ahead to the Road under Bridge is designed to release the surplus discharge of 13.46 m3/s.
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