Yes and no. In theory, current is proportional to the effort made by the pump, therefore its flow. In reality, the height of the level in the well, the pressure on the other side of the pump, and the liquid viscosity, also the deterioration of the pumps and even the voltage influence the current being used by a pump. So in a highly controlled lab, it could be possible to use current to calculate flow, but in a lift station it is not reliable.