The discharge over a sharp-edged rectangular notch of width w depth h is equal to

A

$$\frac{2}{3}C_dw \sqrt{2g} h^{\frac{5}{2}}$$

B

$$\frac{2}{3}C_dw \sqrt{2g} h$$

C

$$\frac{2}{3}C_dw \sqrt{2g} h^{\frac{3}{2}}$$

D

$$\frac{8}{15}C_dw \sqrt{2g} h^{\frac{3}{2}}$$