Figure 2-18.—Transformer pad details for use with the site plan shown in figure 2-15.

Figure 2-18.—Transformer pad details for use with the site plan shown in figure 2-15. Surface water is rain that runs off the ground into areas or during a drought, the supply may be minimal streams, rivers, and lakes. It is the most common source or significantly reduced. used for a water supply. The availability of this source, Groundwater is the water that percolates through the soil and builds up as underground sources. As though, depends on the amount of rainfall an area groundwater seeps through the soil, it collects over an receives. In areas where there is substantial rain, the impervious stratum (a layer of earth, usually rock, that amount of surface water may be plentiful; but in dry the water cannot penetrate) and forms a water level 2-15