What you will achieve
- Import an EPANET INP file in WatDis Free.
- Run the steady-state hydraulic calculation with Run Steady.
- Use the pressure bands and review pipe flow and velocity with their displayed units.
Before you start
- Have an EPANET .inp file for a pressurized water-supply network.
- Know whether the source model uses US or SI units.
- Keep the original file unchanged so you can compare or restart.
What Free includes—and what remains Pro
In WatDis Free you can import an EPANET INP file, run the steady-state hydraulic calculation, and review pressure, flow, and velocity.
- Upgrade leads to optional Pro capabilities.
- GA optimization remains a Pro capability.
- Exporting networks with more than 100 nodes requires Pro.
Video resource
Walkthrough: from import to first review
You will learn how to import an INP in WatDis Free, use Run Steady, and review pressure, flow, and velocity.
Import the INP
Load the network and confirm its context
Start from the source model. The certified TC-012-R1 fixture contains 11 nodes and 13 links, so the first check is concrete and repeatable.
Do it in WatDis
- Import the EPANET INP, fit the complete network to the canvas, and confirm that all 11 nodes and 13 links are present.
Checkpoint: The INP is loaded and the network is complete enough to calculate.
Run Steady
Execute the permanent hydraulic calculation
This onboarding demonstrates the steady-state path as the primary calculation. Use the source model units when reading the result legend.
Do it in WatDis
- In Hydraulics, choose Run Steady and wait until the calculated network and its pressure and velocity legend are visible.
Checkpoint: The permanent calculation completed and result bands are visible.
Review pressure, flow, and velocity
Read values before drawing conclusions
Use the network and the result panels together. This certified still supports pressure bands plus a selected pipe's flow and velocity; it does not show a selected node-pressure value.
Do it in WatDis
- With the result legend visible, select the pipe shown and record its flow and velocity with their displayed units.
Checkpoint: Your review records the visible pressure bands and the selected pipe's flow and velocity without treating a band as a confirmed finding.
Common mistakes
Common mistakes
Starting with a Pro action
The basic Free path uses Run Steady. Upgrade is optional and GA optimization remains Pro.
Reading colors without units
Confirm the source unit system and the visible legend before comparing pressure, flow, or velocity.
Treating a band as a diagnosis
A result band identifies where to inspect. Verify model data and operating assumptions before concluding.