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
