The Status Bar at the bottom of the epanet-js interface provides key information at a glance, including the current status of your hydraulic simulation.

This status gives you immediate feedback on your model's calculation state and the validity of the results.

Here's what each status means:

Ready to Run

• Meaning: A simulation has not yet been run for the current network configuration (e.g., you just opened the project or created a new one). No simulation results data is available.
• Action: Click the Simulate button (or use the shortcut Shift+Enter / ⇧Enter) to perform the hydraulic calculations.

Run Successfully

• Meaning: The hydraulic simulation completed without any detected errors or critical warnings. The results shown (e.g., pressures, flows in the Assets Tab and Analysis Tab) are up-to-date and reflect the current network setup.
• Action: You can now analyze your simulation results.

Simulation with Warnings

• Meaning: The simulation completed successfully, and results are available. However, the EPANET engine generated one or more warnings during the calculation. These warnings might indicate potential minor issues, inaccuracies, or unusual hydraulic conditions that you should review.
• Action: Click the Report button (or use the shortcut Alt+R / ⌥R). Review the specific warnings listed to understand their potential impact and determine if any model adjustments are necessary.

Simulation Outdated

• Meaning: You have made changes to your network model (e.g., modified pipe properties, adjusted demands, moved nodes) since the last time a simulation was successfully run. The results currently displayed are from that previous simulation run and may no longer accurately represent the behavior of your modified network.
• Action: Click the Simulate button (or use Shift+Enter / ⇧Enter) again to rerun the simulation and update the results based on your latest changes.

Simulation with Errors

• Meaning: The simulation could not be completed because one or more errors were detected in your model setup (e.g., disconnected network sections, missing essential data, invalid property values). No results are available or valid.
• Action: Click the Report button (or use the shortcut Alt+R / ⌥R). The report will list the specific errors found in your model. You must fix these errors before the simulation can run successfully.