Riverbank degradation is one of important problems, which is currently influencing the occupation around this area. Considerable part of fertile riverbanks are denudation under overland flow and flooding in Iran every year. Therefore, to overcome this problem and erosion control, it is necessary to have analyzing flow hydraulic behavior prediction and also erodiable bank erosion to planned their controls. However, in this research, Babolrood bank erosion has investigated where 5.5 Km of the channel selected. After mapping at 1:1000 scale using HEC-GeoRAS 103 cross-section have introduced from the mentioned distance which is capable to link whit HEC-RAS and ArcView. Finally Manning friction coefficient identified from each one in bed and flood plain of both left and right side. After flow identification geometric characteristics and Manning friction coefficient to HEC-RAS software, water surface profile calculated in different return period.For prediction of erodiabl and sedimentation area max. and min. rates of the channel bank shear stress for different return period identified and finally the erosional exposed area have cheked in the field
Key words: Bank erosion, HEC-GeoRAS, Babolrood River
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