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directions, the hydraulic conductivity may be represented as a second-order tensor quantity (Eagleson, 1970). Darcy's law can then be generalized as:

Kxx

Kxy

Kxz

b

= -

Kyx

Kyy

Kyz

h.

_Kzx

Kzy

If the coordinate system is aligned with the principal directions of the hydraulic conductivity tensor, Darcy's law in three dimensions can be written as:

The governing equations for groundwater flow are generally derived by combining Darcy's law with the continuity equation (conservation of mass).

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