Assistance Needed with “Unknown Soil Value” Error in QSWAT+

[Dessalegn Worku]

Dear QSWAT+ Users,

I am a beginner with QSWAT+ and am currently preparing to set it up for a watershed study in Ethiopia, which covers approximately 66,000 km².

When I loaded the soil data, I encountered an “Unknown soil value” error. I attempted to troubleshoot the issue but was unable to resolve it due to my limited experience. For your reference, I have attached the CSV files, including the lookup table and user soils, and the screenshot of the attribute table. 

Upon inspecting the raster file, I noticed that some pixels contained NoData values (see the screenshot). I attempted to fill these missing values, but was unsuccessful. Despite ensuring that NoData values are consistently accounted for in the raster, lookup table, and user soils, the error persists.

I would greatly appreciate your guidance and support in resolving this issue.

Thank you in advance for your assistance.

[Nancy B. Sammons]

Dessalegn: 

I am seeing several problems in ‘usersoil.csv’.  They are listed below. 

 

--The soil named NoData should be deleted;  The model will crash if this is used.  There are no soil properties included (all zeros).  This should also be deleted in your lookup table;

 

--The layers should always be greater than 10mm. (soil #9);

 

--WATER is not a soil and should not be included in the database (it should be deleted in this file and your lookup table).  You would need to use wetlands/reservoirs for those areas in your watershed. 

 

There may be other issues, but I know these will cause a problem. 

Keep me posted on your progress.

 

Nancy

 

From: qswa...@googlegroups.com <qswa...@googlegroups.com> On Behalf Of Dessalegn Worku
Sent: Sunday, November 16, 2025 6:32 AM
To: QSWAT+ <qswa...@googlegroups.com>
Subject: [QSWAT+ User Group] Assistance Needed with “Unknown Soil Value” Error in QSWAT+

 

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