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Hi there - I'm after some advice in relation to an operation pump I have within my model. The pump is controlled by the upstream water level, and I have a working definition as follows: Define Pump Control == Pump_House !---------------deafult Setting ------------ Pump operation == off Pump Capacity == 0.591 ! capacity in cums Pump period (min) == 1 ! time to start Pump number == 2 ! No of pumps !Set user variable Water_Level == H1D BD2.2 ! Logic if Water_Level > 0.5 ! triger level to start pump Pump operation == on else if Water_Level < 0.1 ! triger level to stop pump Pump operation == off else Pump operation == no change end if End Define In reality the pump needs to start at a water level of -1.3 and stop at -2.0. When I set the variables to these values I am presented with the following error, as if TUFLOW cannot recognize a negative value?: “NoXY: ERROR 1513 - Input variable in line below has not previously been defined. Operating Control Line = if Water_Level > -1.3; Operating Control Input Variable = http://wiki.tuflow.com/index.php?title=TUFLOW_Message_1513” Has anyone else encountered such an issue, or does anyone know a solution? Many thanks for your help. Robin