Following is a list of freeware that provides tools for conducting groundwater investigations and remediation projects. Before you access any software or apps, 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.

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.

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.

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.

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 An interactive program for mass-balance calculations (obsolete program--superseded by NETPATH and PHREEQC).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.

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 An interactive program for mass-balance calculations (obsolete program--superseded by NETPATH and PHREEQC).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.

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 An interactive program for mass-balance calculations (obsolete program--superseded by NETPATH and PHREEQC).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.

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.

Darcy Flux & Groundwater Velocity Calculator
By GroundwaterSoftware.com. A free, online tool to calculate Darcy's Law and average groundwater velocity.

HydroOffice
By Michal Truban. The HydroOffice package is modular software package for users interested in water sciences. It was created and is currently being developed mainly in the author's free time. Its aim is to create powerful software tools to streamline the work in the water sciences. The beginnings of the HydroOffice modules development dates back to 2002 and the individual modules are progressively developed and new modules are added.

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.

HYSEP (for DOS)
By US Geological Survey (USGS). Performs hydrograph separation, estimating the ground-water, or base flow, component of streamflow

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

National Water Information System (NWIS)
By US Geological Survey (USGS). Provides access to water-resources data collected at approximately 1.5 million sites in all 50 US States, the District of Columbia, and Puerto Rico. It includes information on the occurrence, quantity, quality, distribution, and movement of surface and underground waters.

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.

NETPATH (for DOS)
By US Geological Survey (USGS). An interactive program for calculating NET geochemical reactions and radiocarbon dating along a flow PATH.

NETPATH (for LINUX)
By US Geological Survey (USGS). An interactive program for calculating NET geochemical reactions and radiocarbon dating along a flow PATH.

NETPATH (for Windows)
By US Geological Survey (USGS). An interactive program for calculating NET geochemical reactions and radiocarbon dating along a flow PATH.

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.

PHAST (for Windows)
By US Geological Survey (USGS). A 3-dimensional model for simulating ground-water flow, solute transport, and multicomponent geochemical reactions.

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.

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.

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.

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.

PHREEQC (for Windows)
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.

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.

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.

SLUGT2
By Integrated GroundWater Modeling Center (IGWMC). SLUGT2 is an updated version of program 'SLUGT' and computes hydraulic conductivity values based on the analysis of slug-test data.

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.

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).

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.

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.

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.

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.

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.

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This page last updated on 1/13/14