Question

Assertion (A): In the vertical face of triangular retailing wall of any $\frac{h}{b}$ ratio, the eccentricity is $\frac{b}{6}$ for dead storage condition.
Reason (R): For triangular retaining wall under full storage level (retained by vertical face) the eccentricity will be $\frac{b}{6}$ only if $\frac{h}{b}$ ratio is $\sqrt{S}$ (where $S$ is specific gravity of the material of the wall).

• A. both A and R are true and R is the correct explanation of A
• B. both A and R are true but R is not a correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is B both A and R are true but R is not a correct explanation of A

For no tensile stress to develop:
(i) For dead storage or empty condition
$e=\frac{b}{6}$ for any $\frac{h}{b}$ ratio
(ii) For full storage condition
$e=\frac{b}{6}$ when $\frac{h}{b}=\sqrt{S}$