In predicting flood, the mapping and estimation of flood volume and various hydrodynamic models are developed and applied to several rivers with the aid of computers and numerical techniques. Results from this investigation showed that a value of Manning’s coefficient of 0.025 gave an acceptable agreement between observed and simulated values of water levels. ![]() ![]() Graphical and statistical approaches were used for model calibration and verification. The HEC-RAS model was adopted, calibrated, and validated in adopting two sets of observed water levels. HEC-RAS software was the simulation tool used in this study. This study submits the results of the proposition of a hydraulic model in order to determine the roughness coefficient (Manning’s coefficient n) of the Tigris River along 3.5 km within the Maysan Governorate, south of Iraq. In understanding the hydraulic characteristics of river system flow, the hydraulic simulation models are essential tools.
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