There is currently a growing focus on endeavors aimed at optimizing the utilization of our present water resources, and implementing novel projects to achieve maximum efficiency. Sophisticated applications are necessary
to determine the flow resistance in open channels for project design, and control process. For the purpose of
studying sediment movement in open channels, rivers, and waterways, an accurate assessment of bed shear stress is
necessary. Shear stress may be calculated using a variety of techniques, however since hydraulic factors vary, the results are not comparable. Moreover, determining the flow resistance for the project design, and control process in open channels necessitates using sophisticated applications. It is imperative to possess knowledge of the channel and flow characteristics to ascertain the hydraulic roughness, which embodies the resistance of the flow. To study the effect of these parameters on bed shear stress, a series of laboratory experiments were conducted. The comparison of results reveals a wide range of shear stress estimates obtained through these methods. Moreover, the height of roughness, and the surface characteristics of base bed significantly influence the cutting velocity. A laboratory flume with dimensions of 8 meters in length, 40 cm in width, and 40 cm height was utilized to conduct a total of 72 experiments. These experiments involved 4 different slope values, 3 flow rates, and 2 types of sediment with particle sizes of 10, 20, and 30 mm, both in rounded and angular. During the experiment, Froude number values were examined, and it was determined that, in 72 experiments the flow regime can be considered subcritical. The data analysis shows that, in relation to the basic equation for shear stress computation, the proportion of inaccuracy in shear stress determination rises as particle size increases.
Key Words: Flow rate, Experimental Flume, Roughness Coefficient, Manning, angular and rounded sediments