We used the theory of soil resistance.The resistance of the soil refers to electrical resistance per current flow in the soil in which the passage of current in the soil are very vast, it means that even though the currents flowing through the soil is poor conductivity monkan. But the flows can travel over a very wide area in soil may cause the electrical resistance of the soil has a low value. The soil has been used as a passage of flow to discharge for a long time already. Therefore, the electrical resistance of the soil, so it is important to consider. There is no need to know is how much electrical resistance. Several methods have been developed to measure physical difference of soil. In particular, the electrical resistivity values of the soil on which the measurement surface can cause various layman knows the ground floor.
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