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

Calculate Scaling Potential
By SSI Aeration, Inc.. Helps you calculate scaling potential of a membrane using the Langlier Saturation Index (LSI).

GEMI Local Water Tool (LWT)
By Global Environmental Management Initiative (GEMI). A tool for companies and organizations to evaluate the external impacts, business risks, opportunities and management plans related to water use and discharge at a specific site or operation. The GEMI Local Water Tool™(LWT) for Oil and Gas is a tool customized for petroleum companies.

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.

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.

SSI Technology Portal
By SSI Aeration, Inc.. SSI Aeration offers software providing instant budgetary quotations, spec generation, technical calculators, and trouble shooting software for its products. Software includes CurveGen, SSI Instant Estimating Software, Library Catalog, SpecGen, MBBR Estimator, and Image Classifier.

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.

WATER9
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). WATER9 is a Windows based computer program and consists of analytical expressions for estimating air emissions of individual waste constituents in wastewater collection, storage, treatment, and disposal facilities; a database listing many of the organic compounds; and procedures for obtaining reports of constituent fates, including air emissions and treatment effectiveness. WATER9 is a significant upgrade of features previously obtained in the computer programs WATER8, Chem9, and Chemdat8.

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This page last updated on 2/16/17