| Following
is a list of freeware that provides tools for conducting groundwater investigations and remediation projects. To
learn more about a particular item, click on the item name. To
download a software product or visit an interactive web site,
click on "download" or "view," respectively.
But first, please read our disclaimer and
permissions page if you haven't already done so.
AIRSLUG (for Data General AViiON)
By US Geological Survey (USGS). Used to generate type curves needed to estimate transmissivity and storativity from water level data collected during the recovery part of an air-pressurized slug test. UNIX source code is available.
download
AIRSLUG (for DOS)
By US Geological Survey (USGS). Used to generate type curves needed to estimate transmissivity and storativity from water level data collected during the recovery part of an air-pressurized slug test. Source code is available.
download
AIRSLUG (for Silicon Graphics Indigo)
By US Geological Survey (USGS). Used to generate type curves needed to estimate transmissivity and storativity from water level data collected during the recovery part of an air-pressurized slug test. UNIX source code is available.
download
AIRSLUG (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Used to generate type curves needed to estimate transmissivity and storativity from water level data collected during the recovery part of an air-pressurized slug test. UNIX source code is available.
download
BALNINPT (for Data General AViiON)
By US Geological Survey (USGS). An interactive program for mass-balance calculations (obsolete program--superseded by NETPATH and PHREEQC). UNIX source code is available.
download
BALNINPT (for DOS)
By US Geological Survey (USGS). An interactive program for mass-balance calculations (obsolete program--superseded by NETPATH and PHREEQC). Source code is available.
download
BALNINPT (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). An interactive program for mass-balance calculations (obsolete program--superseded by NETPATH and PHREEQC). UNIX source code is available.
download
Bioassay Quick Reference Table
By California Department of Toxic Substances Control. This guide is the prototype of a project aimed at creating an index of all the standard bioassays currently being used in the scientific community. Initially includes ASTM standards.
visit
Darcy Flux & Groundwater Velocity Calculator
By GroundwaterSoftware.com. A free, online tool to calculate Darcy's Law and average groundwater velocity.
visit
HYSEP (for Data General AViiON)
By US Geological Survey (USGS). Performs hydrograph separation, estimating the ground-water, or base flow, component of streamflow. UNIX source code is available.
download
HYSEP (for DOS)
By US Geological Survey (USGS). Performs hydrograph separation, estimating the ground-water, or base flow, component of streamflow
download
HYSEP (for Solaris)
By US Geological Survey (USGS). Performs hydrograph separation, estimating the ground-water, or base flow, component of streamflow. UNIX source code is available.
download
Johnson and Ettinger Model for Subsurface Vapor Intrusion into Buildings
By US Environmental Protection Agency, Office of Solid Waste and Emergency Response. A series of models for estimating indoor air concentrations and associated health risks from subsurface vapor intrusion into buildings.
download
MODBRNCH (for Data General AViiON)
By US Geological Survey (USGS). Surface- and ground-water interactions can be simulated by the coupled BRANCH and USGS modular, three-dimensional, finite-difference ground-water flow (MODFLOW-96) models, referred to as MODBRNCH. Source code is available.
download
MODBRNCH (for DOS)
By US Geological Survey (USGS). Surface- and ground-water interactions can be simulated by the coupled BRANCH and USGS modular, three-dimensional, finite-difference ground-water flow (MODFLOW-96) models, referred to as MODBRNCH. Source code is available.
download
MODBRNCH (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Surface- and ground-water interactions can be simulated by the coupled BRANCH and USGS modular, three-dimensional, finite-difference ground-water flow (MODFLOW-96) models, referred to as MODBRNCH. Source code is available.
download
MODFLOW-2000 (for UNIX)
By US Geological Survey (USGS). MODFLOW-2000 simulates steady and nonsteady flow in an irregularly shaped flow system in which aquifer layers can be confined, unconfined, or a combination of confined and unconfined. Flow from external stresses, such as flow to wells, areal recharge, evapotranspiration, flow to drains, and flow through river beds, can be simulated. Hydraulic conductivities or transmissivities for any layer may differ spatially and be anisotropic (restricted to having the principal directions aligned with the grid axes), and the storage coefficient may be heterogeneous. Specified head and specified flux boundaries can be simulated as can a head dependent flux across the model's outer boundary that allows water to be supplied to a boundary block in the modeled area at a rate proportional to the current head difference between a "source" of water outside the modeled area and the boundary block. MODFLOW is currently the most used numerical model in the U.S. Geological Survey for ground-water flow problems. In addition to simulating ground-water flow, the scope of MODFLOW-2000 has been expanded to incorporate related capabilities such as solute transport and parameter estimation.
download
MODFLOW-2000 (for Windows)
By US Geological Survey (USGS). MODFLOW-2000 simulates steady and nonsteady flow in an irregularly shaped flow system in which aquifer layers can be confined, unconfined, or a combination of confined and unconfined. Flow from external stresses, such as flow to wells, areal recharge, evapotranspiration, flow to drains, and flow through river beds, can be simulated. Hydraulic conductivities or transmissivities for any layer may differ spatially and be anisotropic (restricted to having the principal directions aligned with the grid axes), and the storage coefficient may be heterogeneous. Specified head and specified flux boundaries can be simulated as can a head dependent flux across the model's outer boundary that allows water to be supplied to a boundary block in the modeled area at a rate proportional to the current head difference between a "source" of water outside the modeled area and the boundary block. MODFLOW is currently the most used numerical model in the U.S. Geological Survey for ground-water flow problems. In addition to simulating ground-water flow, the scope of MODFLOW-2000 has been expanded to incorporate related capabilities such as solute transport and parameter estimation.
download
MODFLOW-2005
By US Geological Survey (USGS). MODFLOW-2005 can be used to help address such issues as water availability and sustainability, interaction of ground water and surface water, wellhead protection, seawater intrusion, and remediation of contaminated ground water.
download
MODFLOWP (for Data General AViiON)
By US Geological Survey (USGS). A version of the U.S. Geological Survey modular, three-dimensional, finite-difference, ground-water flow model (MODFLOW), which, with the Parameter-Estimation Package, can be used to estimate parameters by nonlinear regression. The following MODFLOW model inputs can be estimated: layer transmissivity, storage, coefficient of storage, hydraulic conductivity, and specific yield; vertical leakance; horizontal and vertical anisotropy; hydraulic conductance of the River, Streamflow-Routing, General-Head Boundary, and Drain Packages; areal recharge; maximum evapotranspiration; pumpage; and the hydraulic head at constant-head boundaries. Source code is available. Replace by MODFLOW-2000.
download
MODFLOWP (for DOS)
By US Geological Survey (USGS). A version of the U.S. Geological Survey modular, three-dimensional, finite-difference, ground-water flow model (MODFLOW), which, with the Parameter-Estimation Package, can be used to estimate parameters by nonlinear regression. The following MODFLOW model inputs can be estimated: layer transmissivity, storage, coefficient of storage, hydraulic conductivity, and specific yield; vertical leakance; horizontal and vertical anisotropy; hydraulic conductance of the River, Streamflow-Routing, General-Head Boundary, and Drain Packages; areal recharge; maximum evapotranspiration; pumpage; and the hydraulic head at constant-head boundaries. Source code is available. Replace by MODFLOW-2000.
download
MODFLOWP (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). A version of the U.S. Geological Survey modular, three-dimensional, finite-difference, ground-water flow model (MODFLOW), which, with the Parameter-Estimation Package, can be used to estimate parameters by nonlinear regression. The following MODFLOW model inputs can be estimated: layer transmissivity, storage, coefficient of storage, hydraulic conductivity, and specific yield; vertical leakance; horizontal and vertical anisotropy; hydraulic conductance of the River, Streamflow-Routing, General-Head Boundary, and Drain Packages; areal recharge; maximum evapotranspiration; pumpage; and the hydraulic head at constant-head boundaries. Source code is available. Replaced by MODFLOW-2000.
download
Natural Attenuation Software (NAS)
By Virginia Tech. A screening tool to estimate remediation timeframes for monitored natural attenuation (MNA) to lower groundwater contaminant concentrations to regulatory limits, and to assist in decision-making on the level of source zone treatment in conjunction with MNA using site-specific remediation objectives. NAS consists of a combination of analytical and numerical solute transport models.
download
NETPATH (for Data General AViiON)
By US Geological Survey (USGS). An interactive program for calculating NET geochemical reactions and radiocarbon dating along a flow PATH. UNIX source code is available.
download
NETPATH (for DOS)
By US Geological Survey (USGS). An interactive program for calculating NET geochemical reactions and radiocarbon dating along a flow PATH. Source code is available.
download
NETPATH (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). An interactive program for calculating NET geochemical reactions and radiocarbon dating along a flow PATH. UNIX source code is available.
download
OnSite OnLine Tools for Site Assessment
By US Environmental Protection Agency, Office of Research and Development. The OnSite set of online tools for site assessment contains calculators for formulas, models, unit conversion factors and scientific demonstrations to assess the impacts from ground water contaminants.
visit
PHAST (for Windows)
By US Geological Survey (USGS). A 3-dimensional model for simulating ground-water flow, solute transport, and multicomponent geochemical reactions.
download
PHAST (RPM file for Linux)
By US Geological Survey (USGS). A 3-dimensional model for simulating ground-water flow, solute transport, and multicomponent geochemical reactions.
download
PHAST (tar.gz file for Linux)
By US Geological Survey (USGS). A 3-dimensional model for simulating ground-water flow, solute transport, and multicomponent geochemical reactions.
download
PHREEQC (for Linux)
By US Geological Survey (USGS). A program for aqueous geochemical calculations that can perform speciation, inverse, reaction-path, and 1D advective reaction-transport modeling. UNIX source code is available.
download
PHREEQC (for Mac)
By US Geological Survey (USGS). A program for aqueous geochemical calculations that can perform speciation, inverse, reaction-path, and 1D advective reaction-transport modeling. UNIX source code is available.
download
PHREEQC (for Win32)
By US Geological Survey (USGS). A program for aqueous geochemical calculations that can perform speciation, inverse, reaction-path, and 1D advective reaction-transport modeling. Source code is available.
download
PHREEQC (generic UNIX version)
By US Geological Survey (USGS). A program for aqueous geochemical calculations that can perform speciation, inverse, reaction-path, and 1D advective reaction-transport modeling.
download
PHREEQCI (for Windows)
By US Geological Survey (USGS). A graphical user interface for PHREEQC, a multipurpose geochemical program that can perform speciation, inverse, reaction-path, and 1D advective reaction-transport modeling. For Windows.
download
PHREEQE (for Data General AViiON)
By US Geological Survey (USGS). A program for geochemical calculations (obsolete program -- superseded by PHREEQC). UNIX source code is available.
download
PHREEQE (for DOS)
By US Geological Survey (USGS). A program for geochemical calculations (obsolete program -- superseded by PHREEQC). Source code is available.
download
PHREEQE (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). A program for geochemical calculations (obsolete program -- superseded by PHREEQC). UNIX source code is available.
download
PHRQPITZ (for Data General AViiON)
By US Geological Survey (USGS). A modification of the geochemical modeling code, PHREEQE, to permit calculations of geochemical reactions in brines and other highly concentrated electrolyte solutions using the Pitzer virial-coefficient approach for activity-coefficient corrections. UNIX source code is available.
download
PHRQPITZ (for DOS)
By US Geological Survey (USGS). A modification of the geochemical modeling code, PHREEQE, to permit calculations of geochemical reactions in brines and other highly concentrated electrolyte solutions using the Pitzer virial-coefficient approach for activity-coefficient corrections. Source code is available.
download
PHRQPITZ (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). A modification of the geochemical modeling code, PHREEQE, to permit calculations of geochemical reactions in brines and other highly concentrated electrolyte solutions using the Pitzer virial-coefficient approach for activity-coefficient corrections. UNIX source code is available.
download
Soil and Geologic Site Evaluation
By US Environmental Protection Agency and Purdue University. Provides information about the roles that soils, geology and depth to groundwater play in the protection of groundwater (focusing on farms). A risk assessment portion helps determine the potential for contamination at a site based on information supplied by the user
download
Tracer-Test Planning Using the EHTD Program
By US Environmental Protection Agency, National Center for Environmental Assessment (NCEA). A hydrologic tracer-test design (EHTD) methodology has been developed that combines basic measured field parameters (e.g., discharge, distance, cross-sectional area) in functional relationships that describe solute-transport processes related to flow velocity and time of travel. The new method applies these initial estimates for time of travel and velocity to a hypothetical continuously stirred tank reactor as an analog for the hydrologic flow system to develop initial estimates for tracer concentration and axial dispersion, based on a preset average tracer concentration. Root determination of the one-dimensional advection-dispersion equation (ADE) using the preset average tracer concentration then provides a theoretical basis for an estimate of necessary tracer mass.
download
US EPA Johnson & Ettinger Models (with California Health Criteria) (Groundwater Contamination)
By California Department of Toxic Substances Control. Estimates human health risks from subsurface vapor intrusion into buildings. Incorporates human health criteria specific to California, as developed by the Cal/EPA Office of Environmental Health Hazard Assessment (OEHHA).
download
WATERSHEDSS
By North Carolina State University (NCSU) Water Quality Group. WATERSHEDSS (WATER, Soil, and Hydro- Environmental Decision Support System) was designed to help watershed managers and land treatment personnel identify their water quality problems and select appropriate best management practices.
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ZONEBUDGET (for Data General AViiON)
By US Geological Survey (USGS). Computes subregional water budgets using results from the MODFLOW ground-water flow model. Source code is available.
download
ZONEBUDGET (for DOS)
By US Geological Survey (USGS). Computes subregional water budgets using results from the MODFLOW ground-water flow model. Source code is available.
download
ZONEBUDGET (for Silicon Graphics Indigo)
By US Geological Survey (USGS). Computes subregional water budgets using results from the MODFLOW ground-water flow model. Source code is available.
download
ZONEBUDGET (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Computes subregional water budgets using results from the MODFLOW ground-water flow model. Source code is available.
download
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