The following data are for a falling-head permeability test:
• Length of the soil sample = 150 mm
• Area of the soil sample = 1964 mm2
• Area of the standpipe = 25 mm2
• At time t = 0, head difference = 400 mm
• At time t = 8 min, head difference = 200 mm
a. Determine the hydraulic conductivity of the soil (cm/sec).
b. What was the head difference at t = 6 min?