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Pump Not Delivering the Designed Flow in WaterGEMS

I am having a pump at the downstream of the reservoir and it is supplying to the two tanks. 

The problem is, I have set 1 point pump definitions with the design flow of 7.75 ML and the pump is delivering just 7.63 ML. I am unable to find out why there is a difference of .12 ML in this case. 

Also, does initial level of tanks play any role in this?