Why are my version 7 results different from V8i or CONNECT edition results?
Version 7 of WaterGEMS and WaterCAD used a solver that was most similar to the EPANET 2.00.10 solver that is used in WaterCAD and WaterGEMS V8i and CONNECT editions. In order to get the same results in each program open the Calculation Options (Analysis > Calculation Options) or in the CONNECT Edition go to the Home Tab > Options. Double click on Options or Calculation Options to open the properties. Change the active numerical solver to EPANET 2.00.10.