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Getting Started

About epanet-js

Epanet-js is a full port of version 2.2 OWA-EPANET Toolkit in Typescript, providing access to all 122 functions within the toolkit.

The JavaScript library is for engineers, developers and academics to run and share hydraulic analyses or create custom front end or server-side applications.

epanet-js allows you to simulate water distribution networks in javascript using the EPANET engine. If you're not familiar with either water modelling or EPANET, have a read through what is water modelling.

Both epanet-js and @model-create/epanet-engine are MIT licenced, which allows the library to be used in comerical applications. The hydraulic engine used within the epanet-js library is OWA-EPANET 2.2, which is also MIT licenced, with contributions by the following authors.

The source code for the project is hosted on GitHub and external contributions are welcome! You can learn more about the development process, our roadmap and also visit the Github repo.

To get started in using epanet-js, follow the instruction below to install the library in your applicant. To see complex applications built on top of epanet-js, check out the showcase. If you have a project which uses epanet-js and want to share it, please let us know!


To install the stable version with npm:

$ npm install epanet-js

or with yarn:

$ yarn add epanet-js

For those without a module bundler, the epanet-js package will soon be available on unpkg as a precompiled UMD build. This will allow you to drop a UMD build in a <script> tag on your page and access it on the window.epanetJs global variable.


Load and run an existing inp File

Run this example on CodeSandbox

import { Project, Workspace } from "epanet-js";
import fs from "fs";

// Read an existing inp file from the disk
const net1 = fs.readFileSync("net1.inp");

// Initialise a new Workspace and Project object
const ws = new Workspace();
const model = new Project(ws);

// Write a copy of the inp file to the workspace
ws.writeFile("net1.inp", net1);

// Runs toolkit methods: EN_open, EN_solveH & EN_close"net1.inp", "report.rpt", "out.bin");

See the complete list of examples in the examples page.