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The study was conducted on the Adwa dam, located at Mirzapur Uttar Pradesh. When they occur, the dam failures can cause immense damage and loss of life and property. The study considers Complete hydraulic simulation and analysis for a hypothetical breakdown of the Adwa dam was carried out using the DEM (Digital Elevation Model) computer model of the United States Army Corps of Engineers (USACE), the River Analysis System (HEC-RAS) hydrological engineering centre. The average breach width and breach development time of the dam is calculated through the Froehlich regression equation (2008) using the Adwa dam geometrical information. The flood inundation map was generated by HECRAS and imported into Q-GIS to delineate the areas flooded under the assumed dam break scenario. The details of water surface elevations, depth of flood, flood arrival time and velocity of flood wave at different locations of downstream gives an idea about extent of flooding. Study showed that a total of 52 villages were affected by the flood, with the average discharge flow from the dam being breached being 4436.9175m3/s (CMS) at 5:30 hours following dam breach due to piping failure mode. The average water volume collected at the end of the simulation period is 273305.68 1000m3 due to piping failure, respectively. The simulation results showed that in the event of Adwa dam failure, some areas including residential, agricultural and industrial areas were listed as having a very high risk of flooding due to the significant difference in water surface level and ground elevation value. Emergency evacuation will take place within 41 minutes of breach of dam.

Dam break analysis and flood inundation mapping using HEC-RAS for piping failure