A Dam Break Analysis Using HEC-RAS 2D Hydrodynamic Modeling for Decision-Making System

Flood is the disastrous phenomenon of the nature, especially, when it is associated with large dams. The large dam is constructed for multipurpose use, however the major objective to operate to reduce the flood threat at downstream. In recent climatic uncertainty and extremity, dam operation is the challenging part for flood resilience. In addition, old dams have chances to break under extreme condition. To strengthen the resilience condition and improve the decision-making system, recent state-of-art to utilize a dam break analysis for prior threat detection. This is the case of dam break analysis, it has been developed for Madhuban large dam in Gujarat. The Hydrologic Engineering Center's River Analysis System (HEC-RAS) 5.0.7 version of hydrodynamic model in 2D environment is developed for studies. The digital elevation model, flood hydrograph and elevation capacity curve of dam has been utilized for building the model. The entire approach is simulated under the unsteady flow condition. The water surface elevation, water depth, velocity, arrival time, and inundation maps have been prepared under the guideline of Dam Rehabilitation and Improvement Project (DRIP). Probable future catastrophe has been identified and addressed for future resilience. The case will help to produce the flood mitigation strategies associated with dam break case in Gujarat.