Problem

I have entered a value for the Exit Loss Coefficient or Entrance Loss Coefficient field in the properties of a conduit, but I do not see a drop in head at the respective pipe end.

Solution

For better compatibility with EPA-SWMM standards, the Implicit solver accounts for conduit entry/exit loss as part of the pipe headloss; an additional friction loss in the momentum equation. In other words, they apply across the length of the pipeline. So, you will not see a “head loss” at the end of the pipe as one might expect from the energy equation. The effect of such losses is similar to changing the pipe roughness (i.e. Manning's n) 

Note:

1) You can enter a structure loss in the properties of the node at the end of the conduit to incorporate a head "drop" across the structure.

2) The Explicit (SWMM) solver uses the same assumption (applying exit and entrance losses as part of the pipe headloss)

3) If the Entrance Loss, Exit Loss or Average Loss Coefficient was entered for a conduit when using the Implicit or SWMM solver, and then the model was later changed to use the GVF-Convex (SewerCAD) solver, the User Notification "Conduit local losses (Entrance, Exit, Expansion, Contraction) are ignored by this solver" informs the user that the values previously entered in the other solver are not use and not supported by the Convex solver. The fields will also be hidden from the properties window. It may be best to ignore this in case you need to use those coefficients with the Implicit or SWMM solver at a later time. Or to remove them, temporarily switch solvers, or add the fields to your conduit flextable (see this.)

See Also

https://www.openswmm.org/Topic/3385/modeling-minor-losses-at-structures