For epanet-js to correctly display your network on the map, all geographic coordinates in your INP file (for junctions, reservoirs, tanks, and pipe vertices) must be in the WGS84 (EPSG:4326) geographic coordinate system (latitude and longitude).
If your INP file uses a different projection system (e.g., a local state plane or UTM coordinates), you will encounter an error message during import:
Let’s see how to effortlessly update your model’s projection in just a few steps.
In the top right corner of epanet-js there's a Help dropdown menu. We'll click it and choose Utility apps.
This will take us to a complimentary site with different EPANET utils. You can also go directly from https://utils.epanetjs.com/. Feel free to bookmark it for later use.
We select the Projection Converter tool; this will open the application.
To import our network we'll click Select files or drop the file in the drop area.
Then we need to select the current Source Projection for this model. We can do that using the search function or by inputing it with a PRJ file or copy and pasting in a text area the proj4 string or the WKT definition.
This model we’re using as example, uses the EPSG:27700 British National Grid projection. We’ll look up for it in Select projection.
