This paper presents a basic analysis of deposition and erosion processes as an important aspect of sediment management in reservoirs. For this purpose, field data from Haji dam reservoir was analyzed to evaluate the mechanism of sediment deposition and its dependence on the hydraulic conditions especially during floods. This study also includes laboratory experiments and numerical computation to assess these processes under different conditions. Regarding the numerical computation, the bed transients in our experiments were better simulated when the Einstein resistance law was used to compute the effective shear stress in the Ashida-Michiue's sediment transport formula, in comparison to the case using the traditional formulation.