Environmental Engineering Reference
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calculated by a model. Figure 7.13 shows the surface spread of the component and its
decrease in concentration as it moves away from the source. Figure 7.14 shows a cross-
sectional view of the same contamination as it moves down through a soil profile. The
decrease in concentration as it moves away from the source is again shown. Both these
situations are relatively easy to model because of the uniformity of the soil and regolith.
An example of a commercial program used to model GW movement is Modflow,
which was developed by the United States Geological Survey
FIGURE 7.13
Surface view of the spread of a contaminant in soil. Lighter
areas indicate a lower concentration of the component.
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