How to Access and Manipulate the Source Code of the SWAT+ Model? Any Tutorials or Guidelines?

I am working on enhancing the SWAT+ model for my PhD research and need to modify its source code. Could anyone suggest:

Tutorials or documentation for understanding and editing the source code?
Tips or tools for compiling and testing changes?
How much knowledge of Fortran is required for this task? Are there any recommended Fortran tutorials tailored to such purposes?

Any guidance would be greatly appreciated. Thank you!

SWAT model

Catchment Hydrology

Hydrologic and Water Resource Modeling and Simulation

Model Development

Uncertainty Analysis

Climate Change

Climate Change Impacts

SWAT

Water Resources

Crop Growth Modelling

Crop Modeling

Hydrological Modeling

Sensitivity Analysis

Rouhollah Davarpanah

Warsaw University of Life Sciences

Dear Professor Carlson,

Thank you for your kind response. Upon reviewing your model, SVAT, I noticed that it differs from the SWAT model (Soil and Water Assessment Tool) that I am currently working with. The SWAT model was developed by Dr. Jeff Arnold and his team at the USDA Agricultural Research Service.

However, I found that your SVAT model shares some similar objectives and features, which could be highly beneficial for my research. I am currently working on a literature review paper, and I would like to reference your model based on its capabilities and contributions to the field.

So, I will contact you to receive the SVAT model as I am trying to discover its features.

Thank you for your support and consideration.

Regards,

Rouhollah Davarpanah