According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)

A. $$\frac{2}{3} \times {{\text{C}}_{\text{d}}}\left( {{\text{L}} - {\text{nH}}} \right) \times \sqrt {2{\text{gh}}} $$

B. $$\frac{2}{3} \times {{\text{C}}_{\text{d}}}\left( {{\text{L}} - 0.1{\text{nH}}} \right) \times \sqrt {2{\text{g}}} \times {{\text{H}}^{\frac{3}{2}}}$$

C. $$\frac{2}{3} \times {{\text{C}}_{\text{d}}}\left( {{\text{L}} - {\text{nH}}} \right) \times \sqrt {2{\text{g}}} \times {{\text{H}}^2}$$

D. $$\frac{2}{3} \times {{\text{C}}_{\text{d}}}\left( {{\text{L}} - {\text{nH}}} \right) \times \sqrt {2{\text{g}}} \times {{\text{H}}^{\frac{5}{2}}}$$

Answer: Option B