Following is a list of freeware that provides information and tools for the design, operation, and maintenance of stormwater management and control structures. Before you access any software or apps, please read our disclaimer and permissions page if you haven't already done so.

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.

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.

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.

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.

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.

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.

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.

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.

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.

DR3M (Distributed Routing Rainfall-Runoff Model) (for Data General AViiON)
By US Geological Survey (USGS). A watershed model for routing storm runoff through a branched system of pipes and (or) natural channels using rainfall as input. UNIX source code is available.

DR3M (Distributed Routing Rainfall-Runoff Model) (for DOS)
By US Geological Survey (USGS). A watershed model for routing storm runoff through a branched system of pipes and (or) natural channels using rainfall as input. UNIX source code is available.

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.

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.

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.

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.

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.

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.

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.

GLSNET (for Data General AViiON)
By US Geological Survey (USGS). Regional hydrologic regression and network analysis using generalized least squares

GLSNET (for DOS)
By US Geological Survey (USGS). Regional hydrologic regression and network analysis using generalized least squares

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Long-Term Hydrologic Impact Assessment (L-THIA)
By Purdue Research Foundation. An analysis tool that provides estimates of changes in runoff, recharge and nonpoint source pollution resulting from past or proposed land use changes. It gives long-term average annual runoff for a land use configuration, based on actual long-term climate data for that area. By using many years of climate data in the analysis, L-THIA focuses on the average impact, rather than an extreme year or storm.

MEASERR (for Data General AViiON)
By US Geological Survey (USGS). A program for determining error in individual discharge measurements. Source code is available.

MEASERR (for DOS)
By US Geological Survey (USGS). A program for determining error in individual discharge measurements. Source code is available.

MEASERR (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). A program for determining error in individual discharge measurements. Source code is available.

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.

MODEIN (for Data General AViiON)
By US Geological Survey (USGS). Computes total sediment discharge by the modified Einstein procedure. Source code is available.

MODEIN (for DOS)
By US Geological Survey (USGS). Computes total sediment discharge by the modified Einstein procedure. Source code is available.

MODEIN (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Computes total sediment discharge by the modified Einstein procedure. Source code is available.

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.

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.

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.

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.

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.

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.

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.

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).

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.

SAC (Slope-Area Computation) (for DOS)
By US Geological Survey (USGS). Follows USGS standardized procedure for computing discharge by the slope-area method.

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.

SEDDISCH (for Data General AViiON)
By US Geological Survey (USGS). Computes fluvial sediment discharge. Source code is available.

SEDDISCH (for DOS)
By US Geological Survey (USGS). Computes fluvial sediment discharge. Source code is available.

SEDDISCH (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Computes fluvial sediment discharge. Source code is available.

SEDSIZE (for Data General AViiON)
By US Geological Survey (USGS). Computes particle-size statistics of fluvial sediments. Source code is available.

SEDSIZE (for DOS)
By US Geological Survey (USGS). Computes particle-size statistics of fluvial sediments. Source code is available.

SEDSIZE (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Computes particle-size statistics of fluvial sediments. Source code is available.

SWMM (StormWater Management Model) (for Windows)
By US Environmental Protection Agency, Water Supply & Water Resources. A computer model for analysis of quantity and quality problems associated with urban runoff. Both single-event and continuous simulation can be performed on catchments having storm sewers, or combined sewers and natural drainage, for prediction of flows, stages and pollutant concentrations.

SWSTAT (for Solaris)
By US Geological Survey (USGS). Computes surface-water statistics from a Watershed Data Management (WDM) file. Source code is available.

SWSTAT (for Windows)
By US Geological Survey (USGS). Computes surface-water statistics from a Watershed Data Management (WDM) file. Source code is available.

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.

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.

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.

VendInfo
By US Environmental Protection Agency, Waste Management and Research Center. Search Vendor Information (VendInfo) for information on more than 400 pollution prevention equipment, products, or services.

Watershed Plan Builder
By US Environmental Protection Agency. The Watershed Plan Builder is an interactive tool that will help you produce a customized watershed based plan outline.

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.

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.

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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This page last updated on 9/29/16