We found that calculated water surface profiles for different Manning’s n are slightly lower than the measured one, that indicates a continuous underestimation of the roughness coefficient n by the model. For calibration of Manning’s n-values, six different flow regimes were considered based on mean daily flow records between 20. ![]() In this study, we calibrated and validated Manning’s n roughness coefficient using HEC-RAS for Sarimsakli creek that is tributary of the Kizilirmak river in central Anatolia, Turkey. Therefore, it is essential to calibrate and validate the channel’s Manning’s n roughness coefficient using simulation models. Natural channel’s roughness determination constitutes one the most challenging procedure towards the development of hydraulic models for flood prediction and flood hazard mapping.
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