Inundation mapping and analysis of Tehri dam after dam breach using HEC- RAS model
Student name: Ms Nissi A Varghese
Guide: Dr Chander Kumar Singh
Year of completion: 2014
Host Organisation: Intergraph SG & I India Pvt. Ltd., New Delhi
Supervisor (Host Organisation): Mr Vasudeva Rao Vemana
Abstract: Natural or induced floods are of increasing concern to water recourse managers and civil
protection services for three main reasons. Firstly, a continuous and ‘unconscious’ increase
of social pressure in the flooding valleys amplifies flood vulnerabilities and consequently
natural induced flood risk. Secondary, the early warning forecasts of impact of potential
climate changes on water resources, in spite of the high uncertainty associated to these
forecasts, points out to larger flood hazards. Thirdly, dam-breach induced accidents may
occur more frequently due to infrastructure aging.
A satellite prospective approach have been done which provides information of Digital
elevation model, network analysis system, cross section profile, spatial flood extent, and flood
damage statics and also in river engineering studies in a cost effective manner. The study has
been carried out for downstream of Tehri dam. The dam is situated at the confluence of river
Bhagirathi and Bhilangana. The downstream areas are Tehri, Pauri, Haridwar and
Dehradun which are highly prone for flood disaster.
Keywords: flood vulnerability, dam-breach, Digital elevation model, network analysis
system, cross section profile.
