Given data: Mean velocity U $=2\mathrm{.}0$ m$/$s$,$ Density of water $=1027$ kg$/$m$3.$ Density of sand $=2650$ kg$/$m$3,$ Particle size $=0.4$ mm

Calculate the following:

i$)$ Bedshear stress,

ii$)$ Dimensionless particle size,

iii$)$ Critical shield parameter and

iv$)$ Drag coefficient