File: ABSTRACT.TXT


                   WhAEM2000 Model System Abstract


            Center for Exposure Assessment Modeling (CEAM)
    National Exposure Research Lab - Ecosystems Research Division
               Office of Research and Development (ORD)
           U.S. Environmental Protection Agency (U.S. EPA)
                       960 College Station Road
                      Athens, Georgia 30605-2700

                             706/355-8400



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                               Summary

The U.S. EPA's Wellhead Analytic Element Model for Windows (95/98/NT/2000/XP), 
or WhAEM2000, is a public domain ground water hydrology computer program
designed for capture zone delineation and protection area mapping in support
of the State's Wellhead Protection Programs (WHPP) and Source Water
Assessment Planning (SWAP) for public water supplies in the United States.
WhAEM2000 could also be used for the design of capture zones for pump-and-
treat aquifer remediation.

WhAEM2000 provides an interactive computer environment for design of
protection areas based on radius methods, well in uniform flow solutions, and
geohydrologic modeling methods.  Protection areas are designed and overlaid
upon US Geological Survey Digital Line Graph (DLG), Digital Raster Graphic
(DRG) or other electronic base maps.  Base maps are available for download
using a graphical index map for the State. Geohydrologic modeling for steady
pumping wells, including the influence of hydrological boundaries, such as
rivers, recharge, and no-flow contacts, is accomplished using the analytic
element method, specifically the GFLOW1 solver. WhAEM2000 has on-line help
and tutorials, and supports shapefile and dxf import and export.

The user's manual, "Working with WhAEM2000:  Capture Zone Delineation for a 
City Well¯eld in a Valley Fill Glacial Outwash Aquifer Supporting Wellhead 
Protection'', demonstrates modeling practice through a case study.   
Program operation and modeling practice is covered in a series of progres-
sively more complex representations of the wellfield tapping a glacial out-
wash aquifer for the study wellfield.

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