ABSTRACT
The measurement of the direction and magnitude of contaminant migration in the subsurface is often hampered by the heterogeneous and complex nature of most geologic media. An alternative to direct measurement of subsurface migration routes and rates in the unsaturated zone is to indirectly determine water flow using the direction and magnitude of the hydraulic gradient and the hydraulic conductivity of the medium. The direction and magnitude of fluid flow is governed by the tensorial form of Darcy’s law: () q = − K ¯ ¯ ( ψ ) i ¯ https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203752524/4944dc30-7a88-4095-9b59-93e6ffefeae6/content/eq141.tif"/>
