---
title: "EPS Modeling"
canonical: "https://help.innovyze.com/space/infowater/17761785/EPS%20Modeling"
format: markdown
---
An extended period simulation (EPS) is any modeling run that evaluates system hydraulics for a duration greater than a single hydraulic timestep (steady state). You are provided many tools in InfoWater that allow you to customize your EPS simulation.

Many features of InfoWater including SCADA, Energy Management, Water Quality, and Logic Rules are dependent upon a model being analyzed over a series of timesteps (Extended Period Simulation).

## Methodology

To run an extended period simulation,  do the following:

- From the **InfoWater Model Explorer** →  **Operation** tab:


- Choose **Simulation Time**. Once there, double click on the **BASE** simulation time to see the dialog box below.  Uncheck the Steady State option and specify the different Run options. See Simulation Time Dialog Box for more information.
  
  
- Select **Run Manager** from the **InfoWater Control Center** →  **InfoWater** button →  **Tools** menu or by clicking on the **Run Manager** icon from the **InfoWater** **Output** toolbar to run the EPS model.

![image](media://dc80d44c-24f1-4a43-b160-26444e8f642e)


- Specify/alter or customize the **Report Options** and the **Simulation Options** "on the fly" from the **Run Manager** dialog box. Verify the **Time Settings** options as Extended Period by clicking on the **Browse** icon.
- Click on the **Run** icon in the **Run Manager** dialog box to run your EPS model.
- After a model is run, the most recent simulation run results are referred to as the *active* output source. The icons on the Run Manager allow you to run simulations and create new *active* output sources, save output sources for later use, or load output sources for visualization, analysis, and comparison with other output sources.  Use the Output Report Manager to see simulation results in either report or graph formats.
- When you run a simulation, InfoWater uses modeling data associated with the currently active scenario. If you have not developed a custom scenario, the *active* scenario is the “BASE”. To run a model based on a different scenario, activate the desired scenario using the Active Scenario command and then use the Run Manager to perform the simulation for with the selected scenario.