Units for Nutrient Observation Files

[Isaac Kraenbring]

Hi everyone, 

I am in the process of calibrating my first SWAT+ model using the SWAT+ Toolbox, but I can not find a document/post that confirms what units my observation files should be in. My data is in mg/L, and the channel_sd_day.txt file shows the units in kg. Does SWAT+ Toolbox automatically convert my concentration data to kg of X, or do I need to edit my observation data to change the units? 

Thank you! 

[jeremiah alika (Jamal)]

I think you will need to convert it to the load units. That what i did for my own data.

[Liliana Bettolo]

Hi Isaac - 

Either your observation data has to be converted to total loads or your simulated data has to be converted to concentration using the flo_out results (m3/s). I converted my observed concentration to total load, but I have event-based total phosphorus data so I calculated the total load over the event time period and then compared to the same event dates in the simulated data. 

I hope this helps! 

Best, 

Liliana