| Following
is a list of freeware that provides tools for investigating and restoring surface water, wetlands, and sediment. 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.
AMDTreat
By Pennsylvania DEP, West Virginia DEP, and US Office of Surface Mining Reclamation and Enforcement (OSM). Estimates abatement costs for pollutional mine drainage, commonly referred to as Acid Mine Drainage (AMD). AMDTreat can assist a user in estimating costs to abate water pollution using a variety of passive and chemical treatment types; including, vertical flow ponds, anoxic limestone drains, anaerobic wetlands, aerobic wetlands, manganese removal beds, oxic limestone channels, caustic soda, hydrated lime, pebble quicklime, ammonia and soda ash treatment systems. The AMD abatement cost model considers over 400 variables in estimating costs for treatment facility construction, excavation, revegetation, piping, road construction, land acquisition, system maintenance, labor, water sampling, design, surveying, pumping, sludge removal, chemical consumption, clearing and grubbing, mechanical aeration, and ditching.
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AQUATOX
By US Environmental Protection Agency. Predicts the fate of various pollutants in aquatic ecosystems, such as nutrients and organic toxicants, and their effects on the ecosystem, including fish, invertebrates, and aquatic plants.
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Better Assessment Science Integrating Point and Nonpoint Sources (BASINS)
By US Environmental Protection Agency, Office of Science and Technology. Integrates a geographic information system (GIS), national watershed data, and environmental assessment and modeling tools into one package. For use by regional, state, and local agencies in performing watershed and water-quality based studies. Assesses large amounts of point source and nonpoint source data.
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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.
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BLTM (Branched Lagrangian Transport Model) (for Data General AViiON)
By US Geological Survey (USGS). A Branched Lagrangian Transport Model (BLTM). UNIX source code is available.
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BRANCH (for Data General AViiON)
By US Geological Survey (USGS). The Branch-Network Dynamic Flow Model (BRANCH) simulates steady or unsteady flow in a single open-channel reach (branch) or throughout a system of branches (network) connected in a dendritic or looped pattern. BRANCH is applicable to a wide range of hydrologic situations wherein flow and transport are governed by time-dependent forcing functions. Source code is available.
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BRANCH (for DOS)
By US Geological Survey (USGS). The Branch-Network Dynamic Flow Model (BRANCH) simulates steady or unsteady flow in a single open-channel reach (branch) or throughout a system of branches (network) connected in a dendritic or looped pattern. BRANCH is applicable to a wide range of hydrologic situations wherein flow and transport are governed by time-dependent forcing functions. Source code is available.
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BRANCH (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). The Branch-Network Dynamic Flow Model (BRANCH) simulates steady or unsteady flow in a single open-channel reach (branch) or throughout a system of branches (network) connected in a dendritic or looped pattern. BRANCH is applicable to a wide range of hydrologic situations wherein flow and transport are governed by time-dependent forcing functions. Source code is available.
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BSDMS (Bridge Scour Data Management System) (Unix Source Code)
By US Geological Survey (USGS). Developed to support preparation, compilation, and analysis of bridge-scour measurement data including site data, measured data, flood event data, and channel geometry data.
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CADDIS Biological Impairment Identification System
By US Environmental Protection Agency. An online tool that helps investigators in the regions, states and tribes find, access, organize, use and share information to produce causal evaluations in aquatic systems.
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CAP (Culvert Analysis Program) (for Data General AViiON)
By US Geological Survey (USGS). Follows USGS standardized procedures for computing flow through culverts. It can be used to develop stage-discharge relationships for culverts and to determine discharge through culverts from high water marks. It will compute flows for rectangular, circular, pipe arch, and other nonstandard shaped culverts.
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CAP (Culvert Analysis Program) (for DOS)
By US Geological Survey (USGS). Follows USGS standardized procedures for computing flow through culverts. It can be used to develop stage-discharge relationships for culverts and to determine discharge through culverts from high water marks. It will compute flows for rectangular, circular, pipe arch, and other nonstandard shaped culverts.
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CAP (Culvert Analysis Program) (for Silicon Graphics Indigo)
By US Geological Survey (USGS). Follows USGS standardized procedures for computing flow through culverts. It can be used to develop stage-discharge relationships for culverts and to determine discharge through culverts from high water marks. It will compute flows for rectangular, circular, pipe arch, and other nonstandard shaped culverts.
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CAP (Culvert Analysis Program) (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Follows USGS standardized procedures for computing flow through culverts. It can be used to develop stage-discharge relationships for culverts and to determine discharge through culverts from high water marks. It will compute flows for rectangular, circular, pipe arch, and other nonstandard shaped culverts.
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CGAP (Channel Geometry Analysis Program) (for Data General AViiON)
By US Geological Survey (USGS). Helps analyze, interpret, and quantify the physical properties of an open-channel reach as defined by a sequence of cross sections. Source code is available.
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CGAP (Channel Geometry Analysis Program) (for DOS)
By US Geological Survey (USGS). Helps analyze, interpret, and quantify the physical properties of an open-channel reach as defined by a sequence of cross sections. Source code is available.
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CGAP (Channel Geometry Analysis Program) (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Helps analyze, interpret, and quantify the physical properties of an open-channel reach as defined by a sequence of cross sections. Source code is available.
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CORMIX (Cornell Mixing Zone Expert System)
By Dr. Robert Doneker, Portland State University. CORMIX is a USEPA-supported mixing zone model and decision support system for environmental impact assessment of regulatory mixing zones resulting from continuous point source discharges. The system emphasizes the role of boundary interaction to predict steady-state mixing behavior and plume geometry.
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E431 (for Data General AViiON)
By US Geological Survey (USGS). Performs step-backwater and floodway analyses (obsolete program--superseded by WSPRO). Source code is available.
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E431 (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Performs step-backwater and floodway analyses (obsolete program--superseded by WSPRO). Source code is available.
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Ecological Structure Activity Relationships (ECOSAR)
By US Environmental Protection Agency, Office of Pollution Prevention and Toxics (OPPT). Used to estimate the toxicity of chemicals used in industry and discharged into water. The program predicts the toxicity of industrial chemicals to aquatic organisms such as fish, invertebrates, and algae by using Structure Activity Relationships (SARs). The program estimates a chemical's acute (short-term) toxicity and, when available, chronic (long-term or delayed) toxicity.
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FEQ (Full Equations Model) (for DOS)
By US Geological Survey (USGS). Simulates flow in a stream system by solving the full, dynamic equations of motion for one-dimensional unsteady flow in open channels and through control structures. Source code is available.
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FESWMS-2DH (for Data General AViiON)
By US Geological Survey (USGS). A modular set of computer programs that simulates two-dimensional, depth-integrated, surface-water flows. FESWMS-2DH consists of an input data preparation program (DINMOD), flow model (FLOMOD), simulation output analysis program (ANOMOD), and graphics conversion program (HPPLOT). UNIX source code is available.
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FourPt (for Data General AViiON)
By US Geological Survey (USGS). A numerical model for simulating unsteady, one-dimensional flow in networks of open channels. UNIX source code is available.
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FourPt (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). A numerical model for simulating unsteady, one-dimensional flow in networks of open channels. UNIX source code is available.
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GENSCN (for Windows)
By US Geological Survey (USGS). GenScn (GENeration and analysis of model simulation SCeNarios) helps create watershed simulation scenarios, analyze results of the scenarios, and compare scenarios. It can be used for of changes in land use, land-use management practices, and water-management operations.
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GeoWEPP
By University at Buffalo, Purdue University, and ARS. The Water Erosion Prediction Project (WEPP) model is a continuous simulation, process-based model that allows simulation of small watersheds and hillslope profiles within those watersheds for assessing various soil and water conservation management options for agricultural, rangeland, and forest sites. The Geo-spatial interface for WEPP (GeoWEPP) utilizes digital geo-referenced information such as digital elevation models (DEM) and topographical maps to derive and prepare valid model input parameters and defaults to start site-specific soil and water conservation planning for a small watershed with a single soil and land use for each sub-catchment.
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GLSNET (for Data General AViiON)
By US Geological Survey (USGS). Regional hydrologic regression and network analysis using generalized least squares
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GLSNET (for DOS)
By US Geological Survey (USGS). Regional hydrologic regression and network analysis using generalized least squares
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HEC-FDA
By US Army Corps of Engineers. The Hydrologic Engineering Center's Flood Damage Analysis (HEC-FDA) computer program is designed to assist Corps of Engineers study team members in using risk-based analysis methods for flood-damage-reduction studies as required by the Corps (EM 1110-2-1419). The approach incorporates descriptions of uncertainty of key parameters and functions into project benefit and performance analyses.
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HEC-GeoHMS
By US Army Corps of Engineers. The Geospatial Hydrologic Modeling Extension (HEC-GeoHMS) is a software package for use with the ArcView Geographic Information System. GeoHMS uses ArcView and Spatial Analyst to develop a number of hydrologic modelng inputs. Analyzing digital terrain information, HEC-GeoHMS transforms the drainage paths and watershed boundaries into a hydrologic data structure that represents the watershed response to precipitation. In addition to the hydrologic data structure, capabilities include the development of: grid-based data for linear quasi-distributed runoff transformation (ModClark), the HEC-HMS basin model, physical watershed and stream characteristics, and background map file.
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HEC-GeoRAS for ArcGIS 9
By US Army Corps of Engineers. HEC-GeoRAS for ArcGIS 9 is a package of ArcGIS 9 macros specifically designed to view and manipulate geospatial data for use in the Hydrologic Engineering Center's River Analysis System (HEC-RAS). The graphical user interface allows users with minimal GIS experience to create a HEC-RAS import file containing geometric attribute data from an existing digital terrain model (DTM). Water surface profile data exported from HEC-RAS simulations may also be viewed using HEC-GeoRAS. The HEC-GeoRAS macros are written in the arc macro language (AML) and require the ArcInfo program with the TIN extension.
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HEC-GeoRAS for ArcInfo (Unix)
By US Army Corps of Engineers. HEC-GeoRAS for ArcInfo is a package of ArcInfo macros specifically designed to view and manipulate geospatial data for use in the Hydrologic Engineering Center's River Analysis System (HEC-RAS). The graphical user interface allows users with minimal GIS experience to create a HEC-RAS import file containing geometric attribute data from an existing digital terrain model (DTM). Water surface profile data exported from HEC-RAS simulations may also be viewed using HEC-GeoRAS. The HEC-GeoRAS macros are written in the arc macro language (AML) and require the ArcInfo program with the TIN extension.
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HEC-GeoRAS for ArcInfo (Windows)
By US Army Corps of Engineers. HEC-GeoRAS for ArcInfo is a package of ArcInfo macros specifically designed to view and manipulate geospatial data for use in the Hydrologic Engineering Center's River Analysis System (HEC-RAS). The graphical user interface allows users with minimal GIS experience to create a HEC-RAS import file containing geometric attribute data from an existing digital terrain model (DTM). Water surface profile data exported from HEC-RAS simulations may also be viewed using HEC-GeoRAS. The HEC-GeoRAS macros are written in the arc macro language (AML) and require the ArcInfo program with the TIN extension.
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HEC-GeoRAS for ArcView
By US Army Corps of Engineers. The Hydrologic Engineering Centers River Analysis System (HEC-RAS) allows you to perform one-dimensional steady and unsteady flow calculations. HEC-GeoRAS is an ArcView GIS extension that provides the user with a set of procedures, tools, and utilities for the preparation of GIS data for import into HEC-RAS and generation of GIS data from RAS output.
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HEC-HMS
By US Army Corps of Engineers. The Hydrologic Modeling System (HMS) is designed to simulate the precipitation-runoff processes of dendritic watershed systems. It is designed to be applicable in a wide range of geographic areas for solving the widest possible range of problems. This includes large river basin water supply and flood hydrology, and small urban or natural watershed runoff. Hydrographs produced by the program are used directly or in conjunction with other software for studies of water availability, urban drainage, flow forecasting, future urbanization impact, reservoir spillway design, flood damage reduction, floodplain regulation, and systems operation.
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HEC-RAS
By US Army Corps of Engineers. The Hydrologic Engineering Centers River Analysis System (HEC-RAS) allows you to perform one-dimensional steady and unsteady flow calculations.
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HEC-ResSim
By US Army Corps of Engineers. HEC-ResSim Reservoir System Simulation program performs reservoir operation modeling at one or more reservoirs for a variety of operational goals and constraints.
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HSCTM2D (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). The Hydrodynamic, Sediment, and Contaminant Transport Model (HSCTM2D) is a finite element modeling system for simulating two-dimensional, vertically-integrated, surface water flow (typically riverine or estuarine hydrodynamics), sediment transport, and contaminant transport.
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HSPEXP (for Data General AViiON)
By US Geological Survey (USGS). Allows the user to edit the input file for the Hydrologic Simulation Program -- Fortran (HSPF), simulate with HSPF, produce plots of HSPF output compared to observed values, compute error statistics for a simulation, and provide the user with expert advice on which parameters should be changed up or down to improve the calibration. UNIX source code is available.
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HSPEXP (for DOS)
By US Geological Survey (USGS). Allows the user to edit the input file for the Hydrologic Simulation Program -- Fortran (HSPF), simulate with HSPF, produce plots of HSPF output compared to observed values, compute error statistics for a simulation, and provide the user with expert advice on which parameters should be changed up or down to improve the calibration.
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HSPF (Hydrologic Simulation Program -- FORTRAN) (for Data General AViiON)
By US Geological Survey (USGS). Simulates for extended periods of time the hydrologic, and associated water quality, processes on pervious and impervious land surfaces and in streams and well-mixed impoundments. UNIX source code is available.
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HSPF (Hydrologic Simulation Program -- FORTRAN) (for DOS)
By US Geological Survey (USGS). Simulates for extended periods of time the hydrologic, and associated water quality, processes on pervious and impervious land surfaces and in streams and well-mixed impoundments. UNIX source code is available.
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HSPF Y2K Patch (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). A Year 2000 (Y2K) patch for the HSPF model system.
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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.
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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.
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HYSEP (for DOS)
By US Geological Survey (USGS). Performs hydrograph separation, estimating the ground-water, or base flow, component of streamflow
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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.
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Internet Geographical Exposure Modeling System (IGEMS)
By US Environmental Protection Agency, Office of Pollution Prevention and Toxics (OPPT). IGEMS is a modernization of OPPT's older Graphical Exposure Modeling System and PCGEMS tools. IGEMS brings together in one system several EPA environmental fate and transport models and some of the environmental data needed to run them. IGEMS includes models and data for ambient air, surface water, soil, and ground water, and makes the models much easier to use than their stand-alone counterparts. IGEMS will have graphics and Geographical Information System (GIS) capabilities for displaying environmental modeling results.
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IOWDM (for DOS)
By US Geological Survey (USGS). Input and Output for a Watershed Data Management (WDM) file (IOWDM) is designed to reformat data to and from a WDM file. Data in selected WATSTORE card-image formats and flat file formats can be added to a WDM file.
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IOWDM (for Solaris)
By US Geological Survey (USGS). Input and Output for a Watershed Data Management (WDM) file (IOWDM) is designed to reformat data to and from a WDM file. Data in selected WATSTORE card-image formats and flat file formats can be added to a WDM file. UNIX source code is available.
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LIB (for Data General AViiON)
By US Geological Survey (USGS). A collection of related libraries for use in hydrologic applications. Include AIDE (ANNIE Interactive Development Environment), GRAPH (interface to Graphical Kernel System (GKS)), UTIL (for manipulating character strings, numbers, and dates), and WDM (Watershed Data Management file system). UNIX source code is available.
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LIBANNE (for DOS)
By US Geological Survey (USGS). A collection of related libraries for use in hydrologic applications, including a data base (WDM), graphics, and interactive user interface (AIDE).
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LIBANNE (for Solaris)
By US Geological Survey (USGS). A collection of related libraries for use in hydrologic applications, including a data base (WDM), graphics, and interactive user interface (AIDE).
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LIBUTL (for Data General AViiON)
By US Geological Survey (USGS). Utility libraries for interactive prompting, device-independent graphics, and time-dependent data base access. These libraries were developed for use with various surface-water application programs. Source code is available.
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LIBUTL (for DOS)
By US Geological Survey (USGS). Utility libraries for interactive prompting, device-independent graphics, and time-dependent data base access. These libraries were developed for use with various surface-water application programs. Source code is available.
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LIBUTL (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Utility libraries for interactive prompting, device-independent graphics, and time-dependent data base access. These libraries were developed for use with various surface-water application programs. Source code is available.
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MINTEQA2 (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). MINTEQA2 is a equilibrium speciation model that can be used to calculate the equilibrium composition of dilute aqueous solutions in the laboratory or in natural aqueous systems. The model is useful for calculating the equilibrium mass distribution among dissolved species, adsorbed species, and multiple solid phases under a variety of conditions including a gas phase with constant partial pressures. A data base is included for solving a broad range of problems without need for additional user-supplied equilibrium constants.
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MMSOILS (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). The Multimedia Contaminant Fate, Transport, and Exposure Model (MMSOILS) estimates the human exposure and health risk associated with releases of contamination from hazardous waste sites. The methodology consists of a multimedia model that addresses the transport of a chemical in groundwater, surface water, soil erosion, the atmosphere, and accumulation in the foodchain. The human exposure pathways considered in the methodology include: soil ingestion, air inhalation of volatiles and particulates, dermal contact, ingestion of drinking water, consumption of fish, consumption of plants grown in contaminated soil, and consumption of animals grazing on contaminated pasture.
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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.
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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.
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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.
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MODEIN (for Data General AViiON)
By US Geological Survey (USGS). Computes total sediment discharge by the modified Einstein procedure. Source code is available.
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MODEIN (for DOS)
By US Geological Survey (USGS). Computes total sediment discharge by the modified Einstein procedure. Source code is available.
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MODEIN (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Computes total sediment discharge by the modified Einstein procedure. Source code is available.
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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.
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NCALC (for Data General AViiON)
By US Geological Survey (USGS). Calculates Manning's n-valve equation to determine the roughness characteristics of a channel from the discharge or depths of flow in natural channels. Source code is available.
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NCALC (for DOS)
By US Geological Survey (USGS). Calculates Manning's n-valve equation to determine the roughness characteristics of a channel from the discharge or depths of flow in natural channels. Source code is available.
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NCALC (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Calculates Manning's n-valve equation to determine the roughness characteristics of a channel from the discharge or depths of flow in natural channels. Source code is available.
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OTIS
By US Geological Survey (USGS). The one-dimensional transport with inflow and storage (OTIS) is a solute transport model for streams and rivers. Available for a variety of platforms. Email address required for download.
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PEAKFQ (for DOS)
By US Geological Survey (USGS). Performs flood-frequency analysis based on the guidelines delineated in Bulletin 17B, published by the Interagency Advisory Committee on Water Data in 1982.
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PEAKFQ (for Solaris)
By US Geological Survey (USGS). Performs flood-frequency analysis based on the guidelines delineated in Bulletin 17B, published by the Interagency Advisory Committee on Water Data in 1982. Source code is available.
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PEST (Parameter ESTimation)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). PEST is a model-independent parameter estimation package which can communicate with any model through the model's own input and output files. PEST can be used for nonlinear parameter estimation and predictive analysis in many different fields of study including ground and surface water hydrology, geophysics, engineering and others. DOS-based.
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PRMS (Precipitation-Runoff Modeling System) (for Data General AViiON)
By US Geological Survey (USGS). A deterministic, distributed-parameter modeling system developed to evaluate the impacts of various combinations of precipitation, climate, and land use on streamflow, sediment yields, and general basin hydrology. Source code is available.
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PRMS (Precipitation-Runoff Modeling System) (for DOS)
By US Geological Survey (USGS). A deterministic, distributed-parameter modeling system developed to evaluate the impacts of various combinations of precipitation, climate, and land use on streamflow, sediment yields, and general basin hydrology. Source code is available.
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River and Stream Water Quality Model (QUAL2K)
By US Environmental Protection Agency, Exposure Assessment Branch. QUAL2K (or Q2K) is a river and stream water quality model that is intended to represent a modernized version of the QUAL2E (or Q2E) model (Brown and Barnwell 1987).
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SAC (Slope-Area Computation) (for Data General AViiON)
By US Geological Survey (USGS). Follows USGS standardized procedure for computing discharge by the slope-area method.
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SAC (Slope-Area Computation) (for DOS)
By US Geological Survey (USGS). Follows USGS standardized procedure for computing discharge by the slope-area method.
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SAC (Slope-Area Computation) (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Follows USGS standardized procedure for computing discharge by the slope-area method.
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SEDDISCH (for Data General AViiON)
By US Geological Survey (USGS). Computes fluvial sediment discharge. Source code is available.
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SEDDISCH (for DOS)
By US Geological Survey (USGS). Computes fluvial sediment discharge. Source code is available.
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SEDDISCH (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Computes fluvial sediment discharge. Source code is available.
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SEDSIZE (for Data General AViiON)
By US Geological Survey (USGS). Computes particle-size statistics of fluvial sediments. Source code is available.
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SEDSIZE (for DOS)
By US Geological Survey (USGS). Computes particle-size statistics of fluvial sediments. Source code is available.
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SEDSIZE (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Computes particle-size statistics of fluvial sediments. Source code is available.
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Soil and Water Assessment Tool (SWAT)
By US Department of Agriculture, Natural Resources Conservation Service. A river basin scale model developed to quantify the impact of land management practices in large, complex watersheds
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SPAW
By US Department of Agriculture, Natural Resources Conservation Service. SPAW (Soil, Plant, Atmosphere, Water) is a water budgeting tool for farm fields, ponds and inundated wetlands. The SPAW model performs daily hydrologic water budgeting using the SCS Runoff Curve Number method.
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SPREADBAL-2002
By US Geological Survey (USGS). A mineral mass balance analysis spreadsheet for water.
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Surf Your Watershed
By US Environmental Protection Agency, Office of Water. Locate, use and share environmental information about your place, including your watershed
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SWPROD (for Data General AViiON)
By US Geological Survey (USGS). Determines primary productivity and community metabolism in streams and lakes using diel oxygen measurements. UNIX source code is available.
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SWSTAT (for Solaris)
By US Geological Survey (USGS). Computes surface-water statistics from a Watershed Data Management (WDM) file. Source code is available.
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SWSTAT (for Windows)
By US Geological Survey (USGS). Computes surface-water statistics from a Watershed Data Management (WDM) file. Source code is available.
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TDDS (Time-Dependent Data System) (for Data General AViiON)
By US Geological Survey (USGS). A system of computer utilities and routines designed for processing time sequences of discrete, fixed-interval, time-varying geophysical data-in particular, hydrologic data. Source code is available.
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TDDS (Time-Dependent Data System) (for DOS)
By US Geological Survey (USGS). A system of computer utilities and routines designed for processing time sequences of discrete, fixed-interval, time-varying geophysical data-in particular, hydrologic data. Source code is available.
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TDDS (Time-Dependent Data System) (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). A system of computer utilities and routines designed for processing time sequences of discrete, fixed-interval, time-varying geophysical data-in particular, hydrologic data. Source code is available.
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Visual Plumes
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). The Visual Plumes model system is a Windows-based software application for simulating surface water jets and plumes. It also assists in the preparation of mixing zone analyses, Total Maximum Daily Loads (TMDLs), and other water quality applications.
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WASP (for Windows)
By US Environmental Protection Agency, Watershed and Water Quality Modeling Technical Support Center. The Water Quality Analysis Simulation Program (WASP) is a generalized framework for modeling contaminant fate and transport in surface waters.
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WATEQ4F (for Data General AViiON)
By US Geological Survey (USGS). A program for calculating speciation of major, trace, and redox elements in natural waters. UNIX source code is available.
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WATEQ4F (for DOS)
By US Geological Survey (USGS). A program for calculating speciation of major, trace, and redox elements in natural waters. Source code is available.
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WATEQ4F (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). A program for calculating speciation of major, trace, and redox elements in natural waters. UNIX source code is available.
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Water Quality Standards and Criteria
By US Environmental Protection Agency and Purdue University. Provides a framework for maintenance and improvement of water quality when adopted by States, U.S. Territories, and Indian Tribes. This software presents the three components of State and Tribal water quality standards: waterbody uses (e.g. swimming, boating), water quality criteria or limits on chemical concentrations that may be present the waterbody, and antidegradation policy to protect existing water quality. It explains how Indian tribes can become involved, and describes discretionary policies that affect water quality standards (WQS), economic considerations in the WQS program, EPA's role and responsibility in the WQS process, and implementation of WQS through National Pollutant Discharge Elimination System (NPDES) permits. Relevant sections of the Clean Water Act are included, along with information on use attainability analysis, the submittal/approval process, implementation, and public involvement. Additionally, the user is provided with resources, contacts, a glossary of terms, and several examples of water quality standards.
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Water-Effect Ratio for Metals
By US Environmental Protection Agency and Purdue University. Is based on the US EPA's 1994 "Interim Guidance on the Determination and Use of Water-Effect Ratios (WERs) for Metals." The WER procedure is one of three protocols which may be used to derive site-specific water quality criteria for the protection of aquatic life. An overview, two methods for determining WERs, a checklist, the Guidance document, references/resources, and EPA contacts are included. This title is a companion to the Water Quality Standards and Criteria software program. This software program assumes that the user has an understanding of water quality standards and criteria, as well as scientific methods.
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Watershed Plan Builder
By US Environmental Protection Agency. This tool walks you through a series of pages where you can input information about your watershed. The end product is a customized outline that can be used to develop a watershed management plan.
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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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WSPRO (for Data General AViiON)
By US Geological Survey (USGS). Computes water-surface profiles for subcritical, critical, or supercritical flow as long as the flow can be reasonably classified as one-dimensional, gradually-varied, steady flow. Source code is available.
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WSPRO (for DOS)
By US Geological Survey (USGS). Computes water-surface profiles for subcritical, critical, or supercritical flow as long as the flow can be reasonably classified as one-dimensional, gradually-varied, steady flow. Source code is available.
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WSPRO (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Computes water-surface profiles for subcritical, critical, or supercritical flow as long as the flow can be reasonably classified as one-dimensional, gradually-varied, steady flow. Source code is available.
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