**Seepage properties Soil**

For arithmetic calculation in case of rectangular soil element as shown with dimensions * dx *and

*in the following plane, and thickness*

**dz***with perpendicular to this plane. Consider a planar type flow into the considered rectangular soil element.*

**dy**In the

**x-direction ,**it was calculated that the net amount of the water entering and leaving the soil element.

Similarly in the

**z-direction,**we can observe the basic difference between the water inflow and outflow is as s

In case of a two-dimensional steady flow of pore water condition , any imbalance in flow condition into and out of an soil element in the z-direction must be compensated by a corresponding opposite imbalance in the x-direction also. Combining the above equation , and dividing by ** dx.dy.dz** , now the

**continuity equation**is expressed as,

From Darcy’s law it can be expressed, where h is the head causing flow.

When the continuity equation is combined with Darcy’s law equation , the equation for flow of seepage water is expressed as:

For an isotropic soil material in which the permeability properties is the same in all directions (i.e. k _{x}= k _{z}), the **flow equation** is mentioned herewith.

This is the **Laplace equation** with governing two-dimensional steady state flow condition. It can also be solved * graphically, analytically, numerically, or analogically *to solve the seepage equation of soil mass.