If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by

A. $${\text{B}} = 0.22\sqrt {{\text{H}} + {\text{d}}} $$

B. $${\text{B}} = 0.33\sqrt {{\text{H}} + {\text{d}}} $$

C. $${\text{B}} = 0.44\sqrt {{\text{H}} + {\text{d}}} $$

D. $${\text{B}} = 0.55\sqrt {{\text{H}} + {\text{d}}} $$

Answer: Option D