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In the lower reach of the Rupnarayan River, sedimentation is the result of the combined interaction between fluvial and marine processes. Seasonal variation of available shear stress during high and low tide in connection to critical shear stress is the main factor controlling sedimentation. Sediments are mostly transported by suspension with rolling and graded suspension and are deposited in the environment with low to moderately low energy conditions. Sediments are mainly supplied from the upper and middle catchment of the river with little contribution from the river banks. The result of the work will act as a decision supporting system to the engineers, hydrologists, planners and other concerned authorities, working on the aspects of sedimentation and management of associated problems.