Krm

where Vc is the velocity of the contaminant movement in groundwater, V is the groundwater velocity, and R is the retardation factor. A high retardation factor, i.e., high adsorption coefficient, significantly retards the movement of the contaminant in groundwater. Figure 9.13.2 illustrates the effect of advection, dispersion, and retardation on the mobility of a contaminant in groundwater.

A A Advection D Dispersion

S Sorption

B Biotransformation

A A Advection D Dispersion

S Sorption

B Biotransformation

Distance from Continuous Contaminant Source
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