Outlet Assertion Error

[Paige B]

Hi Everyone,

When I try to move on after delineating my watershed this error appears:

2025-09-23T10:26:44     WARNING    Traceback (most recent call last):
              File "C:\Users/paige/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\QSWATPlus\QSWATPlus\delineation.py", line 4670, in runLandscape
              self.makeDistancesToOutlets()
              File "C:\Users/paige/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\QSWATPlus\QSWATPlus\delineation.py", line 1437, in makeDistancesToOutlets
              threshold = self._gv.topo.makeOutletThresholds(self._gv, root)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
              File "C:\Users/paige/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\QSWATPlus\QSWATPlus\QSWATTopology.py", line 3732, in makeOutletThresholds
              assert len(self.outlets) > 0
              ^^^^^^^^^^^^^^^^^^^^^
             AssertionError

I used the draw outlets feature and adjusted the snap threshold to 1000m to account that the points snap to streams. Does anyone know how I may solve this issue?

Thank you!

[Chris George]

Do you have at east one outlet (INLET attribute is zero and RES
attribute is zero) in your inlets/outlets file?

Did delineation report that all points were snapped?

If both these are true, send me your project folder and I will investigate.

Chris

On 9/23/2025 3:29 PM, Paige B wrote:
> Hi Everyone, When I try to move on after delineating my watershed this
> error appears: 2025-09-23T10: 26: 44     WARNING    Traceback (most
> recent call last):               File "C: \Users/paige/AppData/Roaming/
> QGIS/QGIS3\profiles\default/python/
> plugins\QSWATPlus\QSWATPlus\delineation. py",

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[Paige B]

I checked both of these, the RES and INLET are both zero and all outlet points were successfully snapped. I attached my project folder for you to review. Thank you so much for your help.

https://drive.google.com/file/d/1qbw2O1EzGlNyYpQElLm6jolYKaHCzMsu/view?usp=sharing

[Chris George]

Your DEM cell size is 0.00009 x 0.00009 metres. Your whole watershed is
apparently about 92 square cm. I suspect you started with a latlong
raster and changed its projection to UTM instead of reprojecting it.

Chris

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