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 [H1
3/2 - Ha
3/2]
(C) (2/3) Cd × L. 2g [H1
2
- Ha
2
]
(D) (2/3) Cd × L. 2g [H1
5/2 - Ha
5/2]
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 [H1
3/2 - Ha
3/2]
(C) (2/3) Cd × L. 2g [H1
2
- Ha
2
]
(D) (2/3) Cd × L. 2g [H1
5/2 - Ha
5/2]