SSC JE Civil Engineering 30-Oct-2020 Shift 2 Paper

Root zone depth $=2\mathrm{m}$
Existing water content $=5\%$
Dry density of soil $=15\mathrm{kN}∕{\mathrm{m}}^3$
Water applied to the soil $=500{\mathrm{m}}^3$
Water loss due to evaporation and deep percolation = 10%
Area of plot $=1000{\mathrm{m}}^2$
$\mathrm{d}=\frac{500}{1000}-0.10\times \frac{500}{1000}$
$\mathrm{d}=0.90\times \frac{500}{1000}=0.45\mathrm{m}$
∴ Depth of water stored in root zone = 0.45 m
F.C − A.M
F.C − 5 $=\frac{9.81\times 0.45}{15\times 2}\times 100$
F.C = 14.71 + 5 = 19.71%