Hantush-Bierschenk Assumptions

From Kruseman and de Ridder (1991):

The aquifer is confined, leaky, or unconfined
The aquifer has seemingly infinite areal extent
The aquifer is homogeneous, isotropic, and of uniform thickness over the area influenced by the test
Prior to pumping, the piezometric surface is horizontal (or nearly so) over the area that will be influenced by the test
The aquifer is pumped stepwise at increased discharge rates
The well penetrates the entire thickness of the aquifer and thus receives water by horizontal flow
The flow to the well is in an unsteady-state
The non-linear well losses are appreciable and vary according to the expression CQ2