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I failed for the 2nd time, but I need a break. I'll go for it again next april. I suck at air pollution control/emmisions stuff and some of the municipal/hazardous waste management - I'll start to work on them in the fall. any suggestions for additional study prep material in those areas would...

I was wondering if anyone here was familiar with EPANET water modeling program. I am trying to model a water system where there is a check valve that I want to open (so water flows back through the other way) if a tank reaches a certain level. Does anyone know how to word the control to make...