The fact that the field lines extend beyond the edges of the plates means the actual capacitance is greater than that predicted by the above equation, since the effective area of the plates is greater than the actual area. To calculate what the actual capacitance would be involves complex mathematical modeling. To get around this, one can minimize the influence of the edge effects by reducing the percentage of the total number of field lines that are outside the volume between the plates. Since the perc test is meant to simulate the actual conditions in a working septic system, the soil is then pre-soaked for several hours to saturate the soil. This can be accomplished by having the separation the $d$ between the plates be much less than the linear dimensions of the plate, as shown in FIG 3.
Keep adding water to maintain about 12 inches of water in the hole for at least 4 hours. Clay soils should soak for at least 12 hours to fully saturate.
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