Determine the maximum saturated depth over a landfill liner using the Richardson and Zhao equation shown on page 127 if leachate collection pipes are spaced 30 ft apart. For the landfill location, the vertical infiltration for a 25-year, 24-hour storm is 13 inches. The hydraulic conductivity of the drainage layer is 0.006 cm/s and the slope of the liner is 1.8%.