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SewerGEMS Modelling an outlet controlled basin

Hi, 

I have a rising main pumping into a gravity main. The rising main and gravity main is connected with a manhole. 

Even though my pipes are sloped to the minimum and diameters seemingly adequate, I get spikes in the Froude number. I'm assuming that this happens because of the wave action and backflow occurring inside the pipe as a result of a sudden influx in fluid from the rising main. 

Is there a way to simulate a type of outflow controlled attenuation structure that would assist in smoothing out the volume influxes from the rising main into the gravity main?

Kind regards, 

Liezl