You can load a reference curve for a pumping well either in the
observation point properties (in case you have an observation point on
the well location, too) or in the properties of the diagram window
(right-click into the window, 'Properties'). You can either simply
plot the reference curve in the window, or do a scatter plot for the
different times of the simulation (also from the properties dialog).
Please be careful in comparing hydraulic head from the model to
observed hydraulic head in pumping wells. The calculated hydraulic
head will highly depend on the discretization, giving you correct
values only if the size of the elements is approx. equal to the well
radius!

Good luck!
Peter Schätzl
Product Manager FEFLOW
WASY GmbH