The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H +Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)

• A. (2/3) Cd × L.√2g [H1 - Ha]
• B. (2/3) Cd × L. √2g [H13/2 - Ha3/2]
• C. (2/3) Cd × L.√2g [H12 - Ha2]
• D. (2/3) Cd × L. √2g [H15/2 - Ha5/2]