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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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Fereshteh Kordrostami, Chris George4

Feb 6

Questions on impact of channel delineation on LSUs and using LSU shapefile

The gaps in the hru2 shapefile are the HRUs removed by whatever filter method you used. These gaps

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Questions on impact of channel delineation on LSUs and using LSU shapefile

The gaps in the hru2 shapefile are the HRUs removed by whatever filter method you used. These gaps

Feb 6

Grmay Kassa Brhane, Nancy B. Sammons2

Feb 5

Requesting clarification and help

Grmay Kassa: You may need to send me your current txtinout, but if you send me your 'soils.sol

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Requesting clarification and help

Grmay Kassa: You may need to send me your current txtinout, but if you send me your 'soils.sol

Feb 5

Yashas Kumar H K

Feb 5

Issue with Inlet–Recall Configuration in SWAT+ Model

Dear Connection, I am currently attempting to connect one of the headwater watersheds to the lower

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Issue with Inlet–Recall Configuration in SWAT+ Model

Dear Connection, I am currently attempting to connect one of the headwater watersheds to the lower

Feb 5

Feb 5

NO3 Leaching Location

Hello everyone. used both models for my watershed: 1. SWAT+ (No gwflow integration) 2. SWAT+ (with

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NO3 Leaching Location

Hello everyone. used both models for my watershed: 1. SWAT+ (No gwflow integration) 2. SWAT+ (with

Feb 5

Feb 5

Nitrate Leaching Results

I am new to SWAT+. I run both models: SWAT+ only and SWAT+ with gwflow. I could not find the results

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Nitrate Leaching Results

I am new to SWAT+. I run both models: SWAT+ only and SWAT+ with gwflow. I could not find the results

Feb 5

Matthew Lombardo, Nancy B. Sammons3

Feb 3

Error Running SWAT+ Editor

Matthew: Thank you for the snapshot. Take a look at your soils database (soils.sol is the filename).

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Error Running SWAT+ Editor

Matthew: Thank you for the snapshot. Take a look at your soils database (soils.sol is the filename).

Feb 3

Feb 2

Dear Group, I have been experiencing an issue with my QSWAT+ project. My project covers a large

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Dear Group, I have been experiencing an issue with my QSWAT+ project. My project covers a large

Feb 2

Matthew Lombardo, yashas2

Feb 2

Issue Identifying HRU's in LSU

Try to look at the LSU report in the text file - Yashas Kumar HK, Ph.D. Postdoctoral Fellow,

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Issue Identifying HRU's in LSU

Try to look at the LSU report in the text file - Yashas Kumar HK, Ph.D. Postdoctoral Fellow,

Feb 2

Fereshteh Kordrostami

Jan 30

Impact of channel delineation on LSUs and searching an alternative for hru2.shp

Hello everyone, I have two questions: 1. Channel delineation thresholds: If lower drainage-area

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Impact of channel delineation on LSUs and searching an alternative for hru2.shp

Hello everyone, I have two questions: 1. Channel delineation thresholds: If lower drainage-area

Jan 30

Jan 30

Database error? (SQLITE)

While creating HRU i am facing problem of sqlite file. I want to use user soil standard database of

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Database error? (SQLITE)

While creating HRU i am facing problem of sqlite file. I want to use user soil standard database of

Jan 30

Matthew Lombardo

Jan 27

Time Rule or Decision Tables/Scenarios

Hi all, I am trying to irrigate an LSU for only one or two days at a time, is there a time rule for

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Time Rule or Decision Tables/Scenarios

Hi all, I am trying to irrigate an LSU for only one or two days at a time, is there a time rule for

Jan 27

Judith Eeckman, Haikal Arif2

Jan 15

How to add a new land use class ?

Hi there, Maybe you could try the Semi Automatic Classification Plugin in QGIS. You could define how

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How to add a new land use class ?

Hi there, Maybe you could try the Semi Automatic Classification Plugin in QGIS. You could define how

Jan 15

Jan 15

Extreme Sediment Output 10^12 Mg/ha in 0.01ha Catchment

Hi everyone, I'm modeling a tiny 0.01 ha mudstone badland area (all bare) using a high-res UAV

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Extreme Sediment Output 10^12 Mg/ha in 0.01ha Catchment

Hi everyone, I'm modeling a tiny 0.01 ha mudstone badland area (all bare) using a high-res UAV

Jan 15

Romitha Wickramasinghe

Jan 13

Issue with Importing Hourly Rainfall Data into SWAT+ Editor

Hi, I am trying to simulate a storm event using hourly time steps in SWAT+. Although I prepared the

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Issue with Importing Hourly Rainfall Data into SWAT+ Editor

Hi, I am trying to simulate a storm event using hourly time steps in SWAT+. Although I prepared the

Jan 13

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

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

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