Abstract: A method of monitoring a pump which operates to pump sewage from a wet well in which the current drawn by the pump is detected along with the speed of operation of the pump and the wet well level. The detected values are compared with stored values in a look up table to determine whether the pump is blocked.

Abstract: A method of flushing a wet well operating under a constant level pumping regime in a sewage system in which the wet well level is monitored and controlled along with the pump operation in response to a predicted period of reduced inflow. The method operates such that in advance of the predicted period of reduced inflow, the wet well level is allowed to rise to a flush level and during the predicted period of reduced inflow, the wet well level is reduced from the flush level to a normal level. Independent claims are included to a control unit, a pumping station and a sewage system, which are respectively operable under the claimed method.