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Record Search Query: ServiceParameters>MODELS>HYDROLOGIC AND TERRESTRIAL WATER CYCLE MODELS

Chemical Modeling of Acid Waters
Entry ID: USGS_WATEQ4F
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Summary
Abstract: WATEQ4F is a chemical speciation code for natural waters. It uses field measurements of temperature, pH, Eh, dissolved oxygen and alkalinity, and the chemical analysis of a water sample as input and calculates the distribution of aqueous species, ion activities, and mineral saturation indices that indicate the tendency of a water to dissolve or precipitate a set of minerals (see Drever, 1988; Nordstrom and Munoz, 1986). The model assumes homogeneous aqueous phase equilibria, except for redox species. Equilibrium with respect to mineral solubilities is not assumed. The program results are used primarily to examine the tendency of a water to reach mineral solubility equilibria as a constraint on interpreting the chemistry of natural waters. Results also may be used for reaction modeling with the programs BALANCE and PHREEQE.

[Summary provided by the USGS.]

Related URL
Link: GET SERVICE > GET SOFTWARE PACKAGE
Description: Download WATEQ4F software.

Link: VIEW RELATED INFORMATION > USER'S GUIDE
Description: View the WATEQ4F manual.
Service Citation
Originators: James Ball, Kirk Nordstrom
Title: Chemical Modeling of Acid Waters
Provider: U.S. Geological Survey
URL: http://wwwbrr.cr.usgs.gov/projects/GWC_chemtherm/software.htm
Use Constraints
See the USGS software use policy: http://water.usgs.gov/software/help/notice/
Service Provider
Office of Surface Water, Water Resource Division, USGS, U.S. Department of the Interior

Service Provider Personnel
Name: WATER RESOURCES U.S. GEOLOGICAL SURVEY
Email: h2osoft at usgs.gov
Contact Address:
U.S.G.S.
Hydrologic Analysis Software Support Program
437 National Center
City: Reston
Province or State: VA
Postal Code: 20192
Country: USA
Distribution Media
Distribution_Media: Online
Distribution_Size: 0.3 MB
Fees: No fees
Personnel
WATER RESOURCES U.S. GEOLOGICAL SURVEY
Role: TECHNICAL CONTACT
Email: h2osoft at usgs.gov
Contact Address:
U.S.G.S.
Hydrologic Analysis Software Support Program
437 National Center
City: Reston
Province or State: VA
Postal Code: 20192
Country: USA

TYLER B. STEVENS
Role: SERF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Creation and Review Dates
SERF Creation Date: 2008-05-28
SERF Last Revision Date: 2008-05-29
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