On an assessment of an existing water system in Cameroon, the supply pipe from the source discharges into a sedimentation tank.  The source intake has been constructed to maintain a steady flow of 100 L/min even when the source contains suspended silt during the rainy season.  Jar tests have been conducted and it is confirmed that most of the silt particles are of medium size and settle at an approximate rate of 2 m/hr.  If 2m/hr is considered an appropriate settling velocity what should the surface area of the tank be in m²?