Q. For a symmetrical trapezoidal open drain in a landscape with grass and loose rock surface, the velocity of flow of water is m/sec, (rounded off to two decimal places), given the following data.
Water edge width at the top= 750 mm
Water edge width at the bottom = 450 mm
Water depth = 600 mm
Manning’s coefficient of roughness = 0.05 Slope along the
drain= 1 in 250
A. 4.5
B. 0.45
C. 45
D. 1.5
Ans: 0.45
Solution:
