Fluid Mechanics

A wide rectangular channel of bed slope $S_0 = 0.0004$ carries water at a depth of $1.5\text{ m}$ ($R \approx y = 1.5\text{ m}$). If Manning's roughness coefficient is $n = 0.02$, calculate the flow velocity in $\text{m/s}$ using Manning's equation $v = \frac{1}{n} R^{2/3} S_0^{1/2}$.