Hello,
I'm having following arrangement in my model.
CM 3 and CM1 is flowing to O2 and CM2 is assigned to O1 and simulated the model.
in the second scenario, I want to assign the the inflow time series of O2 to CM 2 as a Inflow (WET) collection.
my question is, in the Second scenario, does it count the time of concentration of catchment CM2 for the the flow time series assigned as Inflow (WET) collection to reach O1?
BR
Nishadi
Hello Nishadi,
Which solver are you using in SewerGEMS and which runoff method? I assume you are using the Explicit or Implicit solver, with the Unit Hydrograph or EPA-SWMM runoff method.
If you have entered an inflow hydrograph in the properties of CM-2, it will be added along with the runoff hydrograph calculated from CM-2. Meaning, the CM-2 runoff hydrograph is calculated separately and summed with the inflow hydrograph you enter, to produce the overall flow graph for CM-2 (and O-1.)
Depending on the solver and runoff method, SewerGEMS supports directly assigning the catchment outflow element to another catchment. So, if you want the runoff from CM-1 and CM-3 to discharge onto the surface of CM-2, be subjected to the loss method and Tc of CM-2, and then discharge to O-1, this might be the best approach. Or, this could be considered one single catchment if O-1 represents the collection point for all three areas together in your second scenario. For example in the second scenario you could make CM-1 and CM-3 inactive and adjust the area, Tc and loss method for CM-2 to represent all three together. Subareas or the CN/Area collection percent connected could also be considered for that single catchment.
If this does not help, please tell us a bit more about this modeling situation and why you need to do this.