The finite difference flow and transport simulator VS2DT was benchmark tested against several other codes which solve the same equaltions (Richards equation for flow and the Advection-Dispersion equation for transport). The benchmark problems investigated transient twodimensional flow in a heterogeneous soil profile with a localized water source at the ground surface. The VS2DT code performed as well as or better than all other codes when considering mass balance characterisitcs and

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... l speed. It was also rated highly relative to the other codes with regard to ease-of-use. Following the benchmark study, the code was verified against two analytical solutions, one for two-dimensional flow and one for two-dimensional transport. These independent verifications show reasonable agreement with the analytical solutions, and complement the one-dimensional verification problems published in the code's original documentation.