When the location of the water discharge is changed in a pumping system, that changes the system, which will, in turn, change the point on the performance curve at which the pump will operate. The comment was made that the pump performance improved over the previous year, but we don’t know how it changed. We will assume it means that the flow rate has increased. This would be perfectly normal if the discharge pressure that the pump is required to produce is lower than it was on the previous test.

The rule to remember is that a centrifugal pump is a slave to the system, and will only do what the system demands. Therefore if the system requires a lower output pressure from the pump, then the pump operation will move further out on its curve and deliver a higher flow rate.