Abstract: Flood hydrodynamic study is an important technique to assess the flood hazards in a flood-prone area. Flood inundation, flood arrival time, flood velocity, and water surface elevation are important parameters to quantify the performance of the hydrodynamic model for flood assessment; however, the sensitivity of these parameters is purely dependent on flood boundary condition, Digital Elevation Model (DEM) resolution, roughness coefficient, and 2D cell size. Therefore, to identify the efficacy of boundary conditions on flood hydrodynamic studies, a present case is performed on the Purna River, Gujarat, India. The Purna River (urban coastal) flood is considered for modeling. The downstream boundary condition is replaced with tidal waves and identify the efficacy in flood parameters in the 2D hydrodynamic condition. The HEC-RAS model is simulated with and without tidal boundary conditions. The model is validated with observed flood heights. The calibration and validation have been performed to check the adequacy and consistency of the model. The model without tide effect unveiled a high R2 value (0.9707) and low RMSE and STD values (0.7045, 0.7251) respectively, demonstrating that the model without tide effect is more efficacious and performs better. The results are elaborated with the significance of tide a flood plain. The critical flood inundation assessment with tidal boundary is an important case study to understand the role of the tidal waves on 2D floods for coastal urban areas. This study could be useful for the decision maker to prepare an efficient flood assessment and resiliency plan for coastal urban flooding.

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