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:
![Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]](https://www.gkseries.com/blog/wp-content/uploads/2023/10/Determine-the-correctness-or-otherwise-of-the-following-Assertion-A-and-the-Reason-R.jpg)
