A duck pond, 15 m in diameter, receives a steady inflow of water from a stream. The inflow averages 0.5m3/d. There is no outlet to the pond. The water simply drains vertically downwards through the sandy base of the pond. If the sandy base of the pond is 1.5m thick and the sand has a hydraulic conductivity of 1m/d and a porosity of 25%, a) What is the flow rate via the sand (L3T-1)