The 2-D contaminant transport under uniform unidirectional flow conditions is governed by the following equation; OC a'C ac ac D at Ox @y? Ox where C stands for contaminant concentration, D, and D, denote the dispersion coefficients in x- and y-directions, respectively, v is the uniform flow velocity, x and y are the spatial coordinates and t represents time. For the system illustrated in the figure below, the dispersion coefficients D, and Dy are specified to be 1.5 m/day and 0.75 m/day, respectively, the flow velocity is specified as 0.15 m/day. A continuous contaminant source with a width of 5 m is located along x = 0 and -2.5