2.6. Determine the hydraulic conductivity from the following data obtained using a constant head test: L = 30 cm, A = 105 cm², Ah = 40 cm, water collected in 5 min = 800 mL. Also, determine the seepage velocity if porosity n = 0.35. 2.7. Can a variable head test be used to determine the hydraulic conductivity of the soil specimen in Problem 2.6? For a standpipe with cross-sectional area a = 0.5 cm², what would be the rate of drawdown of the water level in the pipe?