Question

The dimensions of Manning’s coefficient is

• A. $\text{L}^{-1/3} \text{T}$
• B. $\text{L}^{-2/3} \text{T}$
• C. $\text{L}^{1/3} \text{T}$
• D. $\text{L} \text{T}^{1/3}$

Hint:

Manning's roughness coefficient is not dimensionless.
Its dimensional formula, \( \text{L}^{-1/3} \text{T} \), is derived directly from the relationship between length-based hydraulic radius and time-based velocity.

Answer 1

The Correct Option is A