International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 07 | July 2022
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p-ISSN: 2395-0072
DAM BREAK HAZARD MAPPING: A CASE STUDY OF MULLAPERIYAR DAM Prof. Jose K George1, Aromal Venu2, Anagha K2, Vismaya T2, Amal Anto2 1 Professor,
Department of Civil Engineering, Mar Athanasius College of Engineering, Kothamangalam B.Tech Civil Engineering, Mar Athanasius College of Engineering, Kothamangalam ---------------------------------------------------------------------***--------------------------------------------------------------------2Student,
Abstract -Mullaperiyar Dam is one of the oldest and
The preparation of the DEM file from the ALOS DEM downstream of the Mullaperiyar and Idukki dam is also a part of it.
weakest dams which is on the verge of collapse. Failure of the dam will have a catastrophic effect on people and property downstream. Thus, Dam break analysis has become increasingly critical for enabling rigorous scientific inquiry and analysis into the eminent risk so that proper remedial measures can be taken. Our project aims at performing the dam break analysis of the Mullaperiyar dam and the following Idukki arch dam. The Idukki dam is the largest arch dam in Asia and has an enormously large capacity. If a dam break happens it will be heavily affected by the thickly populated state of Kerala, so it is necessary to do the flood hazard mapping of both the dam. The final product of our project is to construct a flood inundation map.
2. METHODOLOGY The dam break analysis is done by using the flood routing techniques by St. Venant’s formula. This approach deals with the solving of the continuity and the momentum equations. The initial step of the process is to input the basic input data. The input data are generally are;
Key Words: Flood, Dam, Capacity, Flood Hazard Mapping, Inundation 1. INTRODUCTION Dams are across the world in large numbers. The dams are very much beneficial to us in many ways such as irrigation, power generation, flood protection, etc. But the failure of this dam causes a large devastating flood. Overtopping is the major cause of failure about 34 percent of total dam failure, foundation defects cause 30 percent, and piping and seepage cause 28 percent. Since most of the dam failure is due to overtopping, we are considering the Mullaperiyar dam failure to be due to overtopping. The initial task of performing dam failure is to find the route downstream of the dam break flow. The dam break analysis is done by using HEC-RAS (Hydrologic Engineering Centre River Analysis) software, it is modeling software that models hydraulic flow through a river valley in different scenarios. The program was developed by the American Army corps of Engineers. The main objective of performing dam break analysis is to find the
First arrival time of Flood
Maximum depth of the Flooded water
Maximum velocity
Maximum Water Surface Elevation
Duration of flood
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Topographic data
Catchment Hydrology data
Inflow data
Reservoir data
Dam details
The topographic data are derived from the DEM(Digital Elevation Model), It is the topographic undulation of the downstream regions. The Inflow data are the Inflow hyetograph to the dam. Reservoir data and the dam data include the dam height, weir width, capacity, water elevation storage elevation curve, and location details. The entire process is done in two steps, Mullaperiyar dam to the Idukki dam’s upstream valley and the Idukki dam to the Bhoothathankettu barrage, and finally to the Arabian sea.
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