Sediment particles along a river bed initiate movement when hydrodynamic drag and lift forces overcome gravitational resistance. The bed shear stress $(\tau_0)$ generated by turbulent open channel flow is expressed as: $$\tau_0 = \gamma_w \cdot R \cdot S$$ Where $\gamma_w$ is unit weight of water, $R$ is hydraulic radius, and $S$ is energy slope. The critical shear stress $(\tau_c)$ required to initiate grain motion for coarse non-cohesive sediment $(d > 6\text{ mm})$ is evaluated using Kramer’s Equation or White’s Equation: $$\tau_c = \eta \cdot (\gamma_s - \gamma_w) \cdot d \cdot \tan\phi$$ Where $\eta$ is packing factor, $\gamma_s$ is unit weight of sediment, $d$ is grain diameter, and $\phi$ is angle of repose of bed sediment. Monsoonal flushing along Himalayan river channels brings massive volumes of coarse bed material that alter channel conveyance and flood risks. Modern river research institutes in India deploy continuous hydro-acoustic bedload monitoring and high-s...