Issue with Wetland Curve Number (CN) Not Updating in SWAT+ Editor

[Namraj Jaishi]

Hello

I hope this email finds you well. I’m currently working on a model for Caney Creek in Montgomery County, Texas, and I’m experiencing an issue where the Curve Number (CN) for wetland land uses (wetf and wetw) is not updating correctly in the SWAT+ Editor. Despite following the standard procedures for modifying the CN values, the wetland CN remains at 0, leading to unrealistic runoff values in the model.

Here’s what I’ve done so far:

1. Updated the Curve Number for the wetland land uses:
   • wetf_lum → linked to pastg_f (CN = 69)
   • wetw_lum → linked to open_p (CN = 79)
2. Checked the Land Use Management (LUM) to ensure the correct CN assignments.
3. Verified the HRU-to-LUM mapping for wetland HRUs (wetf and wetw).
4. Saved Changes and Written Input Files.

However, despite these changes, the CN still shows as 0 for both wetf and wetw in the model’s output. This is resulting in excessively high surface runoff from the wetlands, which is unrealistic.

I’d greatly appreciate it if anyone in the group could provide insight or suggestions on:

• Why the CN values might not be updating correctly.
• Are there any additional steps or settings I might be overlooking?

Best,

Namraj Jaishi

[Nancy B. Sammons]

Namraj:  

I believe this was a problem that has been fixed in a newer version of the model.  What version of SWAT+ are you currently using?  This is printed at the top of all the output (*.txt) files. 

Nancy

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[Nancy B. Sammons]

Namraj: 

Thank you for your email.  This is a more recent model than I thought.  Please send me the contents of your current txtinout folder and I will take a look. 

Nancy

 

 

From: Namraj Jaishi <nbhus...@gmail.com>
Sent: Friday, April 10, 2026 1:19 PM
To: Nancy B. Sammons <nancy....@brc.tamus.edu>
Cc: SWAT+ Editor <swatplu...@googlegroups.com>
Subject: Re: [SWAT+ Editor User Group] Issue with Wetland Curve Number (CN) Not Updating in SWAT+ Editor

 

Helo Nancy
I used the SWAT editor V3.2.0
I tried using different curve number categories, but it is not reflected or updated in the Landuse summary.

I appreciate your help.

Here is the Txtin out  folder  as well
https://drive.google.com/file/d/1IRl4ePABsj1Qac5WleGKH_EtWHp95Bog/view?usp=drive_link

[Namraj Jaishi]

Helo Nancy
I used the SWAT editor V3.2.0
I tried using different curve number categories, but it is not reflected or updated in the Landuse summary.

I appreciate your help.

Here is the Txtin out  folder  as well
https://drive.google.com/file/d/1IRl4ePABsj1Qac5WleGKH_EtWHp95Bog/view?usp=drive_link

On Fri, Apr 10, 2026 at 10:32 AM Nancy B. Sammons <nancy....@brc.tamus.edu> wrote:

[Namraj Jaishi]

I tried to ruin the model using rev. 61.0.2.61 and the official version as well. It did not make a change either.
Here is the link for txtinout: https://drive.google.com/file/d/1IRl4ePABsj1Qac5WleGKH_EtWHp95Bog/view?usp=drive_link

Best,

Namraj