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Controlling pumping station flow (variable) in WaterGEMS

Hi,

I'm trying to model (with Watergems SelectSeries6) a network that has 2 different pumping stations. One pumping station pumps based on a pattern (pressure based on pumped flow), the other pumping station pumps a fixed flow. The crux here is that the fixed flow of the second pumping station is always a fixed percentage of the flow pumped by the first pumping station. So if the total network demand is 100 m3/h at a certain timestep and pumping station 2 always pumps 50 % of the flow pumped by pumping station 1, then the fixed flow value of pumping station 2 at that timestep should be 33.33 m3/h. However this fixed flow value varies based on the demand with each timestep, which i cant seem to model (using controls). I could create a flow pattern for pumping station 2 (based on the total system demand pattern) which takes into account the fixed pumping percentage, but i'd have to update this flow pattern each time I apply changes to the demand in my model, which is not very efficient.

With kind regards,

Joeri Legierse