Watershed not covering the whole DEM

[Ashwin Ghimire]

Hi everyone,

I’m having an issue where the streams I created using an NIH Burn-In shapefile and a working DEM don’t cover the full DEM right after I click “Create Watershed.” This causes the sub-basins to only partially cover the DEM.

Before clicking “Create Watershed,” everything looks fine — the streams shows full coverage over the DEM. The DEM itself is a clipped version of my watershed, which I did using a shp of the watershed intentionally to help create the watershed within the same boundary.

Does anyone know why this might be happening? Any advice would be greatly appreciated.

Thanks in advance!

[Chris George]

The watershed is the area that QSWAT+ calculates as flowing to your
outlet. You cannot determine this in advance.

If you want to fix the watershed boundary the only way to guarantee it
is to use an existing watershed model. Read the QSWAT+ manual to see
how to do this.

Chris

On 11/12/2025 8:53 PM, Ashwin Ghimire wrote:
> Hi everyone, I’m having an issue where the streams I created using an
> NIH Burn-In shapefile and a working DEM don’t cover the full DEM right
> after I click “Create Watershed. ” This causes the sub-basins to only
> partially cover the DEM. Before

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>
> Hi everyone,
>
> I’m having an issue where the streams I created using an NIH Burn-In
> shapefile and a working DEM don’t cover the full DEM right after I click

> *“Create Watershed.”* This causes the sub-basins to only partially cover
> the DEM.
>
> Before clicking *“Create Watershed,”* everything looks fine — the

> streams shows full coverage over the DEM. The DEM itself is a clipped
> version of my watershed, which I did using a shp of the watershed
> intentionally to help create the watershed within the same boundary.
>
> Does anyone know why this might be happening? Any advice would be
> greatly appreciated.
>
> Thanks in advance!
>

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