R

PbKd

where:

C = contaminant concentration vi = seepage or average pore water velocity in the direction xi Dij = dispersion coefficient Kij = hydraulic conductivity

C = solute concentration in the source or sink fluid W' = volume flow rate per unit volume of the source or sink n = effective porosity h = hydraulic head

R = retardation factor xi = cartesian coordinate

The following discussion uses a simplified two-dimensional representation of Equation 9.13(1) to describe the transport of contaminants in groundwater. In a homogeneous, isotropic medium having a unidirectional steady-state flow with seepage velocity V, Equation 9.13(1) can be rewritten as

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