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While the internal water quality simulation capabilities only evaluates decay or growth of a single constituent, an extension is available (EPANET-MSX), which allows modeling of interactions between constituents.ĮPANET's computational engine is available for download as a separate dynamic link library for incorporation into other applications. This capability is frequently used to predict chlorine residuals within water distribution systems. The network hydraulics solver employed by EPANET uses the "Gradient Method" first proposed by Todini and Pilati, which is a variant of Newton–Raphson method.ĮPANET includes the capability to model water age and predict flow of non-reactive and, under simplified conditions, reactive materials.

EPANET can also model a pump as a constant power input, effectively adding a given amount of energy to the system downstream of the pump element. The model calculates the flow conveyed by the pump element for a given system head condition based on this curve. Within EPANET, pumps are modeled using a head-flow curve, which defines the relationship between hydraulic head imparted to the system by the pump and flow conveyed by the pump. Since the pipe segment headloss equation is used within the network solver, the formula above is selected for the entire model. Chezy-Manning formula: used to model pressurized flow by using Chezy's roughness coefficients for Manning's equation.Darcy-Weisbach formula: used to model pressurized flow under a broader range of hydraulic conditions.

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Hazen-Williams formula: used to model full flow conditions under simplified conditions (turbulent flow, temperature around 60 degrees Fahrenheit, and viscosity similar to water).

Hydraulic simulation Headloss in pipe segments ĮPANET hydraulics engine computes headlosses along the pipes by using one of the three formulas: These various types of data reporting visualization tools are used to assist to analyze the networks, which include the graphics views, tabular views, and special reports. The visual network editor of EPANET simplifies the process of building piping network models and editing their properties. The storage tanks can be modeled as complete mix, plug flow or two-compartment reactors. The package employs the global reaction rate coefficient which can be modified on a pipe-by-pipe basis. It tracks the reactive material as it spreads, measuring the percentage of flow from the given nodes.

This helps to compute pumping energy and cost and then model various types of valves, including shutoffs, check pressure regulating and flow control.ĮPANET's water quality modeling functionality allows users to analyze the movement of a reactive or non-reactive tracer material which spreads through the network over time. The modeling provides information such as flows in pipes, pressures at junctions, propagation of a contaminant, chlorine concentration, water age, and even alternative scenario analysis. The package also supports the simulation of spatially and temporally varying water demand, constant or variable speed pumps, and the minor head losses for bends and fittings. EPANET provides a fully equipped and extended period of hydraulic analysis that can handle systems of any size. Therefore, it is arguably considered as the industry standard.ĮPANET provides an integrated environment for editing network input data, running hydraulic and water quality simulations, and viewing the results in a variety of formats.

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The EPANET ".inp" input file format, which represents network topology, water consumption, and control rules, is supported by many free and commercial modeling packages.

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Its computational engine is used by many software companies that developed more powerful, proprietary packages, often GIS-centric. ĮPANET 2 is available both as a standalone program and as an open-source toolkit ( Application Programming Interface in C). It performs extended-period simulation of hydraulic and water-quality behavior within pressurized pipe networks and is designed to be "a research tool that improves our understanding of the movement and fate of drinking-water constituents within distribution systems". C Programming Language(engine) / Object Pascal( User Interface)ĮPANET is a public domain, water distribution system modeling software package developed by the United States Environmental Protection Agency's (EPA) Water Supply and Water Resources Division.