A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Dam Break Flood Hazard Mapping and Vulnerability Analysis in Kulekhani Dam, Nepal
Construction of dam serves numerous purposes. Despite all the advantages, failure of dam structures could result in enormous losses in downstream areas due to unexpected floods. So, dam break study is important to reduce threats of flood in downstream areas during dam failure. The present study was conducted in the year 2021–2022 for Kulekhani Dam in Nepal and it helps to prepare dam break flood hazard map, to identify the vulnerability of downstream and to estimate the time for peak discharge to reach at different sections of the river from Kulekhani Dam to Bagmati River. The equations proposed by Froehlich in 2008 and 1995 were used to calculate dam breach parameters and peak outflow respectively. The maximum flood discharge was calculated as 15,303.61 m3/s. HEC-RAS two-dimensional unsteady flow analysis was performed from which approximately 2.03 km2 of the downstream area was found to be inundated with maximum flood depth of 31.60 m. The cultivable lands, vegetation, roads, bridges, buildings, electric poles and other infrastructures were found to be vulnerable during flood. The peak flood during the dam breach was estimated to reach different settlements in a time period between 60 and 100 min. The model was validated by comparing simulated flood depth and calculated flood depth using the coefficient of determination, Nash–Sutcliffe Simulation Efficiency, RMSE-observation for Standard Deviation Ratio and Percent BIAS which were found to be 1.00, 0.81, 0.44 and −7.81% respectively, all remaining within a prescribed range. Using flood hazard map and vulnerability of the downstream areas, the local government have to identify areas of risk and only then design and extension of market towns, infrastructures, buildings, etc. should be allowed. Concerned authority, local government and national government together have to perform dam break study and prepare flood hazard map, emergency action plan and standard operating procedure, proper evacuation route and open spaces during a disaster.
Dam Break Flood Hazard Mapping and Vulnerability Analysis in Kulekhani Dam, Nepal
Construction of dam serves numerous purposes. Despite all the advantages, failure of dam structures could result in enormous losses in downstream areas due to unexpected floods. So, dam break study is important to reduce threats of flood in downstream areas during dam failure. The present study was conducted in the year 2021–2022 for Kulekhani Dam in Nepal and it helps to prepare dam break flood hazard map, to identify the vulnerability of downstream and to estimate the time for peak discharge to reach at different sections of the river from Kulekhani Dam to Bagmati River. The equations proposed by Froehlich in 2008 and 1995 were used to calculate dam breach parameters and peak outflow respectively. The maximum flood discharge was calculated as 15,303.61 m3/s. HEC-RAS two-dimensional unsteady flow analysis was performed from which approximately 2.03 km2 of the downstream area was found to be inundated with maximum flood depth of 31.60 m. The cultivable lands, vegetation, roads, bridges, buildings, electric poles and other infrastructures were found to be vulnerable during flood. The peak flood during the dam breach was estimated to reach different settlements in a time period between 60 and 100 min. The model was validated by comparing simulated flood depth and calculated flood depth using the coefficient of determination, Nash–Sutcliffe Simulation Efficiency, RMSE-observation for Standard Deviation Ratio and Percent BIAS which were found to be 1.00, 0.81, 0.44 and −7.81% respectively, all remaining within a prescribed range. Using flood hazard map and vulnerability of the downstream areas, the local government have to identify areas of risk and only then design and extension of market towns, infrastructures, buildings, etc. should be allowed. Concerned authority, local government and national government together have to perform dam break study and prepare flood hazard map, emergency action plan and standard operating procedure, proper evacuation route and open spaces during a disaster.
Dam Break Flood Hazard Mapping and Vulnerability Analysis in Kulekhani Dam, Nepal
Lecture Notes in Civil Engineering
Nagabhatla, Nidhi (editor) / Mehta, Yusuf (editor) / Yadav, Brijesh Kumar (editor) / Behl, Ambika (editor) / Kumari, Madhuri (editor) / Shrestha, Nabin (author) / Bhatta, Upendra Dev (author) / Ghimire, Bhola Nath Sharma (author) / Karna, Akhilesh Kumar (author)
International Conference on Trends and Recent Advances in Civil Engineering ; 2022 ; Noida, India
Recent Developments in Water Resources and Transportation Engineering ; Chapter: 7 ; 81-95
2023-09-02
15 pages
Article/Chapter (Book)
Electronic Resource
English
Probabilistic mapping and sensitivity assessment of dam-break flood hazard
| BASE | 2023
Flood Risk = Hazard • Values • Vulnerability
| Taylor & Francis Verlag | 2005
Risk to People Developing New Approaches for Flood Hazard and Vulnerability Mapping
| British Library Conference Proceedings | 2005
Household Vulnerability to Flood Disasters among Tharu Community, Western Nepal
| DOAJ | 2022