Water Measurement Flumes

The discharge over a $90^\circ$ triangular V-notch weir is given by $Q = \frac{8}{15} C_d \sqrt{2g} H^{5/2}$. For $C_d = 0.60$ and $g = 9.81\text{ m/s}^2$ If the head over the notch is $H = 0.20\text{ m}$ (so $0.20^{2.5} \approx 0.01789$), the discharge $Q$ in L/s is: