Which is not the limitation of the Dupuit's theory ?

Concepts:

 Dupuit's theory is used to determine the coefficient of permeability for the confined and unconfined aquifers.

The following are the some assumptions of Dupuit’s Theory:

• The soil mass is homogeneous, isotropic and of infinite aerial extent.
• The velocity of flow is proportional to tangent of hydraulic gradient and not sine.
• The flow is horizontal and uniform throughout the vertical section.
• Entire thickness of soil mass is contributing water to the well.
• Coefficient of transmissibility remains constant at all places and all the time.
• Flow is laminar and Darcy’s law is applicable.
• Ground water conditions remain constant all the time.