If H is the net head at a point and G is specific gravity of the floor material, then the thickness of the impervious floor is given by:

Question

Question

This question was previously asked in

UKPSC JE Civil 8 May 2022 Official Paper-II

Answer 1

Concept:

Given; H = net water head, and G = Specific gravity of floor material.

Weight of the floor per unit area = G× × t

Uplift Force per unit area = × (H + t)

For no uplift failure

Weight of the floor per unit area ≥ Uplift Force per unit area

G× × t ≥ × (H + t)

G× t ≥ H + t

t (G - 1) ≥ H

Hence option (1) is the correct answer.

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