High Simulated Results overstimating the discharge

[Stanzin Angmo]

Dear Dr. Karim and fellow SWAT users,

I am currently working on assessing the impact of land use/land cover (LULC) changes on groundwater recharge using the SWAT model. However, I am facing an issue where the simulated groundwater recharge values are significantly higher than the observed data.

For model input, I have used NASA POWER climatic data and FAO soil data. I would like to request your guidance on which parameters should be prioritized or adjusted to achieve more realistic results.

I have attached all relevant screenshots for your reference. Your support and suggestions would be greatly appreciated.

Best regards,
Stanzin

[omc...@gmail.com]

Hi,

In my personal opinion, you should add more groundwater parameters, because you have a pretty flat simulation. Now, I would consider to look at your weather data, find some local station and analyze if the weather data that you used on your model is accurate, if not then that is the problem.

If your study area is located in a mountanious region, consider snow related parameters and how temperature and precipitation varies over elevation too for your elevation bands.

Regards,

Oscar M Cabezas Nivin

[Stanzin Angmo]

hello oscar its so kind of u to reply me and try to solve my problem yes, i created the model again and tried calibration this time i got better results with R2 =0.46 but while adjusting the parameters i encountered an error plz help whta should i do