Separating HRUs to Simulate Conservation Works
Chris George
the SBN areas is AGRL. Then add a new landuse to the crop table, called
AGRL1, say, and all the other attributes the same as AGRL. Then edit
the landuse map so the SBN AGRL areas have a new landuse value, and add
this value mapped to AGRL1 to your landuse lookup table. Or you could
use the same approach with soils.
Chris
On 9/16/2025 8:30 PM, jorge.rd...@gmail.com wrote:
> Hello everyone, I have a specific question regarding the SWAT
> simulation. I'm modeling a watershed where soil and water conservation
> (SBN) works, such as terracing, were implemented in specific areas. When
> I enter these operations in the .ops
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jorge.rd...@gmail.com
Chris, thank you again for answering and providing suggestions and ideas for the questions and concerns regarding this model. I think the suggestion and idea you mentioned could work. It would be the same crop, but I could split it into a different HRU within the same HRU, while still retaining all the original parameters.
Well, then, I'll give your idea a try today and let you know how it turns out.
Thank you very much, and best regards.
jorge.rd...@gmail.com
Chris, hello again! I followed your advice and did what you recommended - generating specific land uses where my SBN (Nature-Based Solutions) are spatially located. For example, these fell into: AGRC, FRST, RNGB, PINE, MESQ, SOYB, CORN, OATS, and BARL.
What I did was make a copy of the parameters from the QSWATRef2012.mdb Access table to preserve the parameters of the same land cover where my SBN are located (see attached image).
For each land use where my SBN are distributed, I created a copy with the same parameters and added them to the same Access database with the following keys to distinguish them. I added suffixes like 21 and 22 for the corresponding project year, just to give them different names but maintain the same parameters: AGRC_21_22, FRST_0_22, RNGB_14_24, PINE_1_22, MESQ_0_24, MESQ_21_22, SOYB_00, CORN_00, OATS_00, BARL_00.
The system doesn't show any errors when adding them, and everything appears correct up to that point. Then I generate my land_use_apan_02.csv as shown in the attached image, as well as my land use raster with corresponding values.
The Problem:
When I read the corresponding databases during HRU creation, the vegetation raster and its land_use_apan_02.csv are read perfectly. However, SWAT reads the same original land uses from the CROP database and does not recognize the new copies I added. When generating the HRUs, it creates the same number of HRUs (1587) as with the original land use setup.
My Question:
Do you have any suggestions on how to properly incorporate these new land use copies to create the specific HRUs I need? Any guidance on the correct procedure for adding new land uses to SWAT would be greatly appreciated.
Thank you very much for your continued help!
