While a steady state simulation shows you a "snapshot" of your network at a single moment, an extended period simulation (EPS) allows you to model your system over time — typically 24 hours or longer.
https://epanetjs.com/assets/blog/progress-report/2025-12/time-control.mp4
This section covers the tools used to set up and analyse an extended period simulation in epanet-js. It walks through how time is defined, how operational behaviour is controlled, how demands vary through patterns, and how results can be explored as the simulation progresses.