I am trying to replicate a field fire flow. After matching boundary conditions in terms of system demand, pumps status and tank levels, I compared actual flow and residual pressure observed in the field with the model results. The static pressures in the model and field test are quite similar, however there is a huge difference in pressure between the model results and field test results for flows > 0 L/s. The model results for different flows (0-20 L/s) is consistent (300kPa), whereas for example @ 15L/s of field flow the recorded pressure is 0kPa. I would be grateful if anybody could help me to sort out the issue. Thanks