Draft: Define all StructureStatusGoals in the same way. The status is a discrete variable and can either be 0 or 1.

The StructureStatusGoal can be used for pumps or pumping stations. In both cases the status is a discrete variable ranging from 0 to 1. a series of constraints ensures that the status of the pumping station must be 0 if all the pumps are off and 1 otherwise.