A Theory of Water Level Estimation to Focus on the Change of Earthing Resistance for the Prediction of Flood Occurrence

Abstract

It is occurring that concentrated heavy rain accompanied by global warming. In some places, the precipitation absorbed in the earth becomes the perched water, the level of the unconfined groundwater rises. As a result, flooding is occurring. It is necessary to observe the water level at the borehole in order to sense the rise in the water level of the groundwater level and make it useful for disaster prevention. But it is difficult to observe at multiple points. On the other hand, there are many earthing electrodes of electric facilities in the place where people are active. The value of total earthing resistance depends on the electrical conductivity of the ground. The value of electrical conductivity of the earth greatly changes when groundwater is present. Therefore, it was inspected the theory of the method to estimate a groundwater level in this paper.