EPA-SWMM CompSource code:Storage unit evaporation loss computation

[Jumadar]

Hi everyone,

Currently am doing my thesis research on assessing BMPs effectivenss in floods management and i have been looking at the swmm 5.0 source code in an effort to introduce infiltration in storage unit.

I noticed that the evaporation loss in storage unit (under function storage_getEvapLoss in node.c), is computed as an average i.e. evapLoss = 0.5*area*evap*tstep.

Does this have to do with the fact that during flow routing the routing totals continuity update in mass balance are applied over half the time step.


Regards

A.S.Jumadar