Hello User,
I answered your question in this link: Tidal Boundary Setup: When Are Harmonic Functions Necessary Alongside Downloaded Water Level Data? - #4 by shanh
As for your question about why in the example “Build a 3D Coastal Model (Level 2 Step-by-Step Guidance)” it’s necessary to select “Model Open Boundary Conditions” instead of “Tidal Level for Model Boundaries” when downloading tidal water level data online:
I’m not sure what you meant here — it’s possible that in this example, we already prepared a water level file, rather than downloading it using the harmonic tool.
Thank you very much.