A sand sample has a bulk density of 20kN/m³ and a degree of saturation of 70%. If the specific gravity of soil grains is 2,65, the value of critical hydraulic gradient for the soil will be (Assume Yw = 10 kN/m³)

The hydraulic conductivity of a sand at a void ratio of 0.71 is 0.044 cm/sec, Estimate the hydraulic conductivity of this sand at a void ratio of 0.55

Problem: For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen - 16 cm Diameter of specimen - 9.6 cm Constant head difference - 50 cm Volume of water collected in 4 min - 420 cc Void ratio of the soil specimen - 0.55 A.) Determine the hydraulic conductivity of the soil in cm/sec B.) Determine the discharge velocity in cm/sec C.) Determine seepage velocity in cm/sec Problem: For a falling head permeability test, the following are given: Length of Soil Specimen - 200mm Area of Soil Specimen - 1000mm^2 Area of Stand pipe - 40mm^2 Head Difference at time t = 0 min - 500mm Head Difference at time t = 3 min - 300mm A.) Compute hydraulic conductivity of the soil in cm/sec B.) Compute the seepage velocity if the porosity is 0.25 in cm/sec C.) What is the head difference at time t = 100 sec in mm