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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 anddoi:10.2172/10105566 fatcat:wxfogi74one27mfo3ea7rsm77u