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Welcome to the QSWAT+ user discussion group.

Please note this group is for questions and discussion related to the QGIS interface, QSWAT+, not the model itself or the editor. For content related to those topics, please see:

For questions and discussions related to the 2012 version of SWAT and its interfaces, please see the SWAT website.

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Website: swat.tamu.edu/plus

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Tulika K, Nancy B. Sammons2

Jan 7

error (73): floating divide by zero

Tulika: If this is still an issue, send me the contents of your current txtinout folder and I will

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error (73): floating divide by zero

Tulika: If this is still an issue, send me the contents of your current txtinout folder and I will

Jan 7

Matthew Lombardo

Jan 7

Flow and Nutrient Routing for Channels - Continued

Hi everyone, I am sorry for the spam. I just discovered something that might be of importance. In the

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Flow and Nutrient Routing for Channels - Continued

Hi everyone, I am sorry for the spam. I just discovered something that might be of importance. In the

Jan 7

Matthew Lombardo

Jan 7

Subbasin Routing to Channel Explanation

Hello everyone, Note: Please disregard my last emails, I was able to find what I was looking for. Can

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Subbasin Routing to Channel Explanation

Hello everyone, Note: Please disregard my last emails, I was able to find what I was looking for. Can

Jan 7

Matthew Lombardo

Jan 7

IWQ — In-stream water quality code for SWAT+

Hi all, This is a question related to the one I just posted. I want to turn off the in stream water

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IWQ — In-stream water quality code for SWAT+

Hi all, This is a question related to the one I just posted. I want to turn off the in stream water

Jan 7

Matthew Lombardo

Jan 7

In-Stream Water Quality Calculations On/Off

Hi everyone, I am trying to get my calibration to work for my nutrients, and the professor I am

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In-Stream Water Quality Calculations On/Off

Hi everyone, I am trying to get my calibration to work for my nutrients, and the professor I am

Jan 7

Fkadu Gebreyesus

Jan 7

Asking on SWAT+ usage

Hello everyone, I would appreciate guidance or best practices for setting up and running SWAT+ for a

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Asking on SWAT+ usage

Hello everyone, I would appreciate guidance or best practices for setting up and running SWAT+ for a

Jan 7

Afonso Augusto Magalhães de Araujo, celray....@gmail.com2

Jan 6

How to “freeze” calibrated parameters in the SWAT+ToolBox:

Hi, When you want to calibrate by subbasin going downstream, make sure each parameter set you add is

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How to “freeze” calibrated parameters in the SWAT+ToolBox:

Hi, When you want to calibrate by subbasin going downstream, make sure each parameter set you add is

Jan 6

Haley, … Mohamed Aboelnour5

Jan 3

Use NHD dataset to delineate watershed

Hi Natalja, This thread is extremely helpful and confirms what I have been encountering with the

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Use NHD dataset to delineate watershed

Hi Natalja, This thread is extremely helpful and confirms what I have been encountering with the

Jan 3

Greg, Chris George3

12/23/25

Watershed model with multiple lakes

Excellent. Thanks. On Tuesday, December 23, 2025 at 1:12:59 PM UTC-6 Chris George wrote: Just add

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Watershed model with multiple lakes

Excellent. Thanks. On Tuesday, December 23, 2025 at 1:12:59 PM UTC-6 Chris George wrote: Just add

12/23/25

Girum Getachew, Chris George2

12/23/25

Greetings and Questions

Assuming the outer red line is the watershed boundary as calculated by QSWAT+, the white areas are

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Greetings and Questions

Assuming the outer red line is the watershed boundary as calculated by QSWAT+, the white areas are

12/23/25

Evren Soylu, Chris George3

12/17/25

Unresponsive QSWAT+ Plugin

Hi Chris and everyone, Thank you for your response, Chris. You accurately identified the issue I was

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Unresponsive QSWAT+ Plugin

Hi Chris and everyone, Thank you for your response, Chris. You accurately identified the issue I was

12/17/25

12/17/25

Removing outlying Streams and channels in QSWAT+

I have trouble removing streams outlying my watershed area. Due to them very weird sub-basins are

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Removing outlying Streams and channels in QSWAT+

I have trouble removing streams outlying my watershed area. Due to them very weird sub-basins are

12/17/25

Paige Babushkin, Chris George3

12/17/25

Error in Existing Watershed Delineation

I did not but this fixed the problem thank you! On Wednesday, November 26, 2025 at 8:39:38 AM UTC-5

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Error in Existing Watershed Delineation

I did not but this fixed the problem thank you! On Wednesday, November 26, 2025 at 8:39:38 AM UTC-5

12/17/25

Paige Babushkin

12/17/25

Flow Direction Error

As I go to move on to Create landscape after delineating the watershed this error appears File C:/

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Flow Direction Error

As I go to move on to Create landscape after delineating the watershed this error appears File C:/

12/17/25

12/17/25

How to add a new land use class ?

Hello, How to add a new land use class corresponding to the raster, in addition to the classes

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How to add a new land use class ?

Hello, How to add a new land use class corresponding to the raster, in addition to the classes

12/17/25

Liliana Bettolo, Chris George2

12/15/25

You cannot rely on the shapefiles to accurately describe HRUs unless you do not filter the HRUs at

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You cannot rely on the shapefiles to accurately describe HRUs unless you do not filter the HRUs at

12/15/25

Salim Shawl, Gafar Agunbiade2

12/15/25

seeking assistance in resolving this error

You need to check the box for print for all annual results. Swat check uses the _aa (annual) to

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seeking assistance in resolving this error

You need to check the box for print for all annual results. Swat check uses the _aa (annual) to

12/15/25

12/10/25

Issue with USLE and SedimentYield

Dear all, I have an issue with the production of sediment in QSWAT+. I do correctly provide the

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Issue with USLE and SedimentYield

Dear all, I have an issue with the production of sediment in QSWAT+. I do correctly provide the

12/10/25

12/10/25

Parametrization of pounds and swales in QSWAT+

Dear all, I am tring to add pounds and swales in QSWAT+. I added the pounds as reservoir, with the

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Parametrization of pounds and swales in QSWAT+

Dear all, I am tring to add pounds and swales in QSWAT+. I added the pounds as reservoir, with the

12/10/25

Riad Arefin, … Osman Furkan TOKGÖZ3

12/8/25

About the update of QSWAT+ data using best simulated parameters.

First you should edit file.cio file and save it with notepad and write "calibration.cal" at

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About the update of QSWAT+ data using best simulated parameters.

First you should edit file.cio file and save it with notepad and write "calibration.cal" at

12/8/25

Osman Furkan TOKGÖZ

12/8/25

Elevation Bands

QSWAT+ separates HRUs into slope bands but does not separate them into elevation bands. As a result,

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Elevation Bands

QSWAT+ separates HRUs into slope bands but does not separate them into elevation bands. As a result,

12/8/25

Ashehad Ali, … Gafar Agunbiade4

12/3/25

Could you please state explicitly the QGIS version? Thanks, Ashehad On Thu, Dec 4, 2025 at 11:04 AM

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Could you please state explicitly the QGIS version? Thanks, Ashehad On Thu, Dec 4, 2025 at 11:04 AM

12/3/25

Matthew Lombardo

12/3/25

soil_k Calibration Using Code

Hello everyone, Has anyone used code to edit soil_k for their calibration. I am using the GLUE method

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soil_k Calibration Using Code

Hello everyone, Has anyone used code to edit soil_k for their calibration. I am using the GLUE method

12/3/25

Afonso Augusto Magalhães de Araujo

11/25/25

Nash number is varying even for regions whose parameters are fixed?

Hello everybody! I am calibrating the basin illustrated in fig_1-stations (attached), step by step,

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Nash number is varying even for regions whose parameters are fixed?

Hello everybody! I am calibrating the basin illustrated in fig_1-stations (attached), step by step,

11/25/25

정세윤, … 아디타마페르지안요가4

11/25/25

Error in Running SWAT+ pathogen moduel

I am also experiencing the exact same pathogen error (“Attempt to fetch from allocatable variable LY

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Error in Running SWAT+ pathogen moduel

I am also experiencing the exact same pathogen error (“Attempt to fetch from allocatable variable LY

11/25/25

11/19/25

Dear QSWAT+ Team, I have installed QSWATPlus on a Linux cluster from https://github.com/swat-model/

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Dear QSWAT+ Team, I have installed QSWATPlus on a Linux cluster from https://github.com/swat-model/

11/19/25

11/19/25

The plugin QSWATPlus caused QGIS to crash

Dear QSWAT+ Users and Developers, I am a beginner to QSWAT+. I have installed QGIS and SWAT+ by

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The plugin QSWATPlus caused QGIS to crash

Dear QSWAT+ Users and Developers, I am a beginner to QSWAT+. I have installed QGIS and SWAT+ by

11/19/25

Dessalegn Worku, Nancy B. Sammons2

11/18/25

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

Dessalegn: I am seeing several problems in 'usersoil.csv'. They are listed below. --The soil

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

Dessalegn: I am seeing several problems in 'usersoil.csv'. They are listed below. --The soil

11/18/25

Afonso Augusto Magalhães de Araujo

11/17/25

Unexpected ToolBox crash near the end of iterations.

Dear all. This is neither the first nor the second time that, after several days of rounds, at the

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Unexpected ToolBox crash near the end of iterations.

Dear all. This is neither the first nor the second time that, after several days of rounds, at the

11/17/25

11/7/25

Unable to Locate QSWAT+ Download Link and Installation Instructions

Dear QSWAT Team, I hope this message finds you well. I am currently working on a watershed modeling

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Unable to Locate QSWAT+ Download Link and Installation Instructions

Dear QSWAT Team, I hope this message finds you well. I am currently working on a watershed modeling

11/7/25

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