Citation:

Description:

WhAEM2000 (wellhead analytic element model for Win 98/00/NT/XP) is a public domain, ground-water flow model designed to facilitate capture zone delineation and protection area mapping in support of the State's and Tribe's Wellhead Protection Programs (WHPP) and Source Water Assessment Planning (SWAP) for public water supply wells in the United States. WhAEM2000 provides an interactive computer environment for design of protection areas based on radius methods, well in uniform flow solutions, and geohydrologic modeling. Protection areas are designed and overlaid upon US Geological Survey Digital Line Graph (DLG) or other electronic base maps. Base maps for a project can be selected from a graphical index map for the State. Geohydrologic modeling for steady pumping wells, including the influence of hydrological boundaries, such as rivers, recharge, no-flow boundaries, and inhomogeneity zones, is accomplished using the analytic element method. Reverse gradient tracelines emanating from the pumping center of known residence time are used to delineate the capture zones. WhAEM2000 has on-line help and tutorials.

Record Details:

Record Type:MODEL

Product Published Date:11/05/2003

Record Last Revised:08/25/2009

Record ID: 74940

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Model Detail:

Model Evaluation :The EPA Quality Assurance Project Plan: Tools and Techniques for Source Water Protection of Public Water Supply Wells, April 2003 documents the project testing procedures. The document GFLOW1 Verifications by Henk Haitjema (2003) describes the details of the solver verifications.

Heather A Raymond, Michael Bondoc, John McGinnis, Kathy Metropulos, Pat Heider, Allison Reed, Steve Saines (2006) Using Analytic Element Models to Delineate Drinking Water Source Protection Areas Ground Water 44 (1) , 16–23 doi:10.1111/j.1745-6584.2005.00122.x

Richard M. Yager, Christopher J. Neville (2002) GFLOW 2000: An Analytical Element Ground Water Flow Modeling System Ground Water 40 (6) , 574–576 doi:10.1111/j.1745-6584.2002.tb02543.x

WR Dripps, RJ Hunt, MP Anderson (2006) Estimating Recharge Rates with Analytic Element Models and Parameter Estimation Ground Water 44 (1) , 47–55 doi:10.1111/j.1745-6584.2005.00115.x

Model URL :http://www.epa.gov/athens/software/whaem/index.html

Model Guidance Documents :The User's Guide, Working with WhAEM2000 (EPA/600/R-00/022) can be downloaded.

Model Download Information :The model is publicly available from the U.S. EPA, Office of Research and Development (ORD), National Exposure Research Laboratory (NERL), Center for Exposure Assessment Modeling (CEAM).

modelcontactinfo :Stephen R. Kraemer, Ph.D.
U.S. EPA Ecosystems Research Division
(706) 355-8340
kraemer.stephen@epa.gov

Model Inputs : Binary base maps or equivalent maps (shapefile, dxf) for representing hydrography, roads, hypsography.

Also aquifer geometry, hydraulic conductivity, porosity, recharge, well discharge.

Model Outputs :Wellhead protection zones, tracelines, hydraulic head contours.

Model Computer Requirements:

Model Operating Systems Needs :Windows 98, NT, XP

Model Hardware Needs :80486 PC with 16 MB RAM and 25 MB ROM (minimum)

Model Programming Language(s) :Import formats supported: DXF, DRG, DLG, ShapefileExport formats supported: DXF, Surfer, Shapefile.

other_req :Visual Basic (GUI), Fortran (Solver)