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Water Software > Groundwater Software > WTAQ

WTAQ: Computer program for calculating drawdowns and estimating hydraulic properties for confined and water-table aquifers


Source code for version 2.1 (February 15, 2017)

Superseded version 1.3 (February 15, 2017)

  • Although WTAQ version 1.3 is superseded by version 2.1, version 1.3 of the program is maintained for those users who do not need the revised model of drainage from the unsaturated zone provided in version 2.1 of the code.
  • A Readme.txt [4KB TXT] file containing installation instructions is included with the Microsoft Windows software distribution file.
  • WTAQ version 1.3 compiled for Microsoft Windows [565KB ZIP], with source code, documentation, and test problems.


Barlow, P.M., and Moench, A.F., 2011, WTAQ version 2 — A computer program for analysis of aquifer tests in confined and water-table aquifers with alternative representations of drainage from the unsaturated zone: U.S. Geological Survey Techniques and Methods 3-B9, 41 p.

Barlow, P.M., and Moench, A.F., 1999, WTAQ — A computer program for calculating drawdowns and estimating hydraulic properties for confined and water-table aquifers: U.S. Geological Survey Water-Resources Investigations Report 99-4225, 74 p.

Point of Contact

Support is provided for correcting bugs and clarification of how the code is intended to work. Only limited assistance can be provided for applying WTAQ to specific problems. For support, contact:

Paul Barlow
U.S. Geological Survey
10 Bearfoot Road
Northborough, MA 01532

Other USGS Groundwater Software

The USGS develops groundwater, water-quality, surface-water, and other water-resources software for use by the USGS in fulfilling its mission. Most of this software is available online for download at no charge.

Disclaimers and Notices

This software has been approved for release by the U.S. Geological Survey (USGS). Although the software has been subjected to rigorous review, the USGS reserves the right to update the software as needed pursuant to further analysis and review. No warranty, expressed or implied, is made by the USGS or the U.S. Government as to the functionality of the software and related material nor shall the fact of release constitute any such warranty. Furthermore, the software is released on condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use. Also refer to the USGS Water Resources Software User Rights Notice for complete use, copyright, and distribution information.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

See also, USGS policy on linking to non-Federal web sites.

Software License and Purchase Information

This software is a product of the U.S. Geological Survey, which is part of the U.S. Government.


This software is freely distributed. There is no fee to download and (or) use this software.


Users do not need a license or permission from the USGS to use this software. Users can download and install as many copies of the software as they need.

Public Domain:

As a work of the United States Government, this USGS product is in the public domain within the United States. You can copy, modify, distribute, and perform the work, even for commercial purposes, all without asking permission. Additionally, USGS waives copyright and related rights in the work worldwide through CC0 1.0 Universal Public Domain Dedication ( [Link exits USGS]).

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Page Last Modified: Friday, 14-Apr-2017 14:42:27 EDT