If the critical hydraulic gradient is 1, then the submerged unit weight is
- A9.81 kN/m³Correct
- B9.01 kN/m³
- C10.21 kN/m³
- DNone of these
Solution
Concept
Submerged unit weight at ic = 1
Formula
γ′ = ic γw
Step-by-step solution
1. ic = γ′/γw = 1 ⇒ γ′ = γw = 9.81 kN/m³.
Explanation
The submerged unit weight equals ic times the unit weight of water.
Why the other options are wrong
Other values do not equal γw.
Shortcut
γ′ = ic γw.
Correct answer: A) 9.81 kN/m³