2016 Q3: Refer to the figure below, estimate The quantity of seepage under the dam in m³/sec/m, the coefficient of permeability is 0.05 cm/sec 2. Factor of safety against piping. (35 Mark) H 5 m Granular soil e=0.55 G₁ = 2.68 Impervious layer

Given the earth dam and flow net shown, calculate the seepage loss under the dam if the water height behind the dam is 15ft. The soil has a hydraulic conductivity of 100 ft/year. EL 0 EL-10 Water Level 730 ft³/year O 650 ft³/year 500 ft³/year 890 ft³/year Water Level Yail=130 lb/ft³ Impervious Stratum

Question 2: After conduct an experiment, you found that the soil for the watershed have an initial rate of infiltration equal to 1.35 in./hr and a final capacity of 0.3 in./hr. Assuming that the time constant k = 0.4, calculate the soil infiltration capacity at the times 10 min, 15 min, 30 min, 1 hr, 2 hr, 4 hr, and 6 hr using Horton's equation. Infiltration