A similar circular glass tube is filled over one half of its area with 40 cm of sand, having a hydraulic conductivity of 10-5 m/s, and over the other half of its area with 40 cm sand having a hydraulic conductivity that is a factor 4 larger, see Figure 7.5. The inner diameter of the circular tube is 10 cm. Calculate the discharge Q through this layered sample, if the head difference between the top and bottom of the sample is 20 cm.
