EPANET is a software application used worldwide for simulating water distribution systems. It was developed as a tool for understanding the movement and fate of drinking water components in distribution systems and can be used for many different types of applications in distribution system analysis. Today, engineers and consultants use EPANET to design and size new water infrastructure, upgrade existing legacy infrastructure, optimize tank and pump performance, reduce energy consumption, study water quality issues, and prepare for emergencies. It can also be used to model pollution threats and assess resilience to security threats or natural disasters.
EPANET is public domain software that may be freely copied and redistributed. It is a Windows® based program that will work with all versions of Windows. Continuing development and bug fixing happen as part of an open-source project on GitHub. Bugs and feature requests can be reported on the site as issues, and for those interested in contributing to the code, information on the quality plan, guidelines for contributors, a software development roadmap, a suite of automated tests, and other information is available.
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Screenshot of EPANET software.
With EPANET software, users can simulate the hydraulic characteristics and water quality in pressure pipeline networks, consisting of pipes, assemblies (connections), pumps, valves, tanks, and reservoirs, over an extended period. It can track the flow of water in each pipe, the pressure at each node, the pressure of the water in each tank, the concentration of chemicals, the age of the water, and the source is tracked throughout the network throughout the simulation period.

User Interface EPANET provides a visual network editor that simplifies the process of building pipe network models and editing their properties and data. A variety of reporting and data visualization tools are used to interpret network analysis results, including color-coded network maps, datasheets, energy use, response, calibration, time series plots, and profile and contour plots.
If the application does not start because it belongs to an unknown developer, pay attention to “Application from an unknown developer”.
If the drive/path you are looking for is not directly accessible from EPANET (this can happen, for example, with network drives), try winecfg:
Right-click EPANET2.app.
Select Show Package Contents.
Start mechs
Click Advanced.
Select “Tools”
Click “Configuration Utility (winecfg)”
Select the “Disks” tab.
Modeling water security and resilience
There are EPANET extensions that work with existing software to simulate the interactions between numerous chemical and biological agents and their interactions with bulk water and pipe walls in water distribution systems.
The EPANET-MSX (Multi-Species eXtension) extension allows EPANET to simulate complex reactions between multiple chemical and biological species both in the bulk flow and at pipe walls. This capability has been included both in a standalone executable program and in a library of functions that programmers can use to create specialized applications. EPANET-MSX allows users to flexibly simulate a wide range of chemical reactions of interest, including autodegradation of chloramines to ammonia, formation of disinfection byproducts, biological growth, rate constants of combined reactions in multi-source systems, and tube wall adsorption reactions limited by oxidation mass transfer.

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