Fig. 2.6 Element in an orthotopic soil.

The component of the hydraulic gradient, ix, at the centre of the element

(Note that it is of negative sign as there is a head loss in the direction of flow.)

The rate of change of the hydraulic gradient ix along the length of the element in the x direction will be:

Hence the gradient at the face of the element nearest the origin dx \dx) \ 2 J - ^h dx

From Darcy's law:

will be

3h dx

The gradient at the face furthest from the origin is

0h d2 h dx

0 0

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