FEMWATER/LEWASTE: Numerical Codes for Delineating Wellhead Protection Areas in Agricultural Regions Based on the Assimilative Capacity CriterionThe Three-Dimensional Finite Element Model of Water Flow Through Saturated-Unsaturated Media (3DFEMWATER or FEMWATER) model is designed to provide a numerical procedure for establishing wellhead protection zones (in agricultural areas) using the assimilative capacity criterion. FEMWATER is a three-dimensional variably saturated zone model that models contaminant movement in heterogeneous and anisotropic media consisting of many geologic formations as desired, considers both distributed and point sources/sinks that are spatially and temporally dependent, and accept four types of boundary conditions.
Input and output are through files.
FEMWATER and LEWASTE (Three-Dimensional Lagrangian-Eulerian Finite Element Model of Waste Transport Through Saturated-Unsaturated Media) are related and can be used together to model flow and transport in three dimensional, variably-saturated porous media under transient conditions with multiple distributed and point sources/sinks. These models can be used to apply the assimilative capacity criterion to development of wellhead protection areas, as each U.S. state is required to do under the 1986 Amendments to the Safe Drinking Water Act. The complexity of 3DFEMWATER/3DLEWASTE numerical models requires that they be used by experienced numerical modelers with strong background in hydrogeology.
The complexity of 3DFEMWATER/3DLEWASTE numerical models requires that they be used by experienced numerical modelers with strong background in hydrogeology.
SOFTWARE AVAILABILITYCenter for Exposure Assessment Modeling (CEAM)
U.S. Environmental Protection Agency
Office of Research and Development
Environmental Research Laboratory
960 College Station Road
Athens, Georgia 30605-2720
The GMS-version of FEMWATER can be obtained from GMS Home Page.
The code can be downloaded at EPA CEAM Femwater site
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