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 intoareas or during a drought, the supply may be minimalstreams, rivers, and lakes. It is the most common sourceor significantly reduced.used for a water supply. The availability of this source,Groundwater is the water that percolates throughthe soil and builds up as underground sources. Asthough, depends on the amount of rainfall an areagroundwater seeps through the soil, it collects over anreceives. In areas where there is substantial rain, theimpervious stratum (a layer of earth, usually rock, thatamount of surface water may be plentiful; but in drythe water cannot penetrate) and forms a water level2-15
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