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EPANET is a program that performs extended period simulation of hydraulic and water quality behavior within pressurized pipe networks. A network can consist of pipes, nodes (pipe junctions), pumps, valves and storage tanks or reservoirs. EPANET tracks the flow of water in each pipe, the pressure at each node, the height of water in each tank, and the concentration of a chemical species throughout the network during a multi-time period simulation. In addition to chemical species, water age and source tracing can also be simulated. The EPANET Programmer's Toolkit is a library of functions (or API) that allow programmers to customize the use of EPANET's hydraulic and water quality solution engine to their own applications. Both EPANET and its toolkit were originally developed and are currently maintained by the U.S. Environmental Protection Agency (USEPA).

The OWA-EPANET Toolkit is an open-source version of the original EPANET Toolkit that extends its capabilities by:

• providing a full set of functions to set and retrieve values for all parameters contained in a network model
• allowing networks to be built completely from function calls instead of from an input file
• allowing multiple projects to be analyzed in parallel in a thread-safe manner
• adding the ability to use pressure dependent demands in hydraulic analyses
• producing more robust results with regard to hydraulic convergence, low/zero flow conditions, and water quality mass balance
• achieving faster run times for single period hydraulic analyses.

Before using the OWA-EPANET Toolkit one should be familiar with the way that EPANET represents a pipe network, the design and operating information it requires, and the steps it uses to simulate a network's behavior. More informaton on these topics is available from the EPANET 2 Users Manual. The description of an EPANET input file identifies all of a network's objects and their properties to which the toolkit provides access. Full documentation for the OWA-EPANET toolkit can be found by clicking the API Documentation tab below.

Note: OWA (Open Water Analytics) exists on GitHub as an open community for the exchange of information and ideas related to computing in the water & wastewater industries. Its activities and code projects are neither affiliated with nor endorsed by the USEPA.