I'm trying to get a system curve for the below system using H2OMap Water. The system consists of the following:
  • Raw water intake modelled as fixed head res
  • Single design point pump
  • Parallel mains, one with a PRV
  • WTP modelled as fixed head res

The results of the system curve simulation, at least for the static head (0 flow), seem to be incorrect. The system consists of an intake at 12 m and a pump delivering to a WTP at 19.9 m. The static head should be 7.9 m, but the system curve is suggesting 3.807 m (see below). When the intake is modelled at 14 m the correct static head of 5.9 m is provided by the model.

Does anyone know what could be causing this problem? Or have I missed something and made an error when modelling the system?



H2OMAP Water System Curve Error.jpg