Steady state seepage is taking place through a soil element at $Q$, $2 \mathrm{~m}$ below the ground surface immediately downstream of the toe of an earthen dam as shown in the sketch. The water level in a piezometer installed at $P, 500 \mathrm{~mm}$ above $Q,$ is at the ground surface. The water level in a piezometer installed at $R, 500 \mathrm{~mm}$ below $Q,$ is $100 \mathrm{~mm}$ above the ground surface. The bulk saturated unit weight of the soil is $18 \mathrm{kN} / \mathrm{m}^{3}$ and the unit weight of water is $9.81 \mathrm{kN} / \mathrm{m}^{3}$. The vertical effective stress (in $\mathrm{kPa}$ ) at $Q$ is

(A) 14.42
(B) 15.89
(C) 16.38
(D) 18.34

Question ID - 155787 | Toppr Answer

Steady state seepage is taking place through a soil element at $Q$, $2 \mathrm{~m}$ below the ground surface immediately downstream of the toe of an earthen dam as shown in the sketch. The water level in a piezometer installed at $P, 500 \mathrm{~mm}$ above $Q,$ is at the ground surface. The water level in a piezometer installed at $R, 500 \mathrm{~mm}$ below $Q,$ is $100 \mathrm{~mm}$ above the ground surface. The bulk saturated unit weight of the soil is $18 \mathrm{kN} / \mathrm{m}^{3}$ and the unit weight of water is $9.81 \mathrm{kN} / \mathrm{m}^{3}$. The vertical effective stress (in $\mathrm{kPa}$ ) at $Q$ is