Daily calibration issue in SWAT-CUP-Premium after successful monthly run

[Tomás González]

Hi, my name is Tomás, and I’m currently calibrating my SWAT model using SWAT-CUP Premium. I successfully calibrated the monthly model, but now I’m trying to calibrate it on a daily time step and encountered an issue during the first simulation (just to check if the original is ok with this parameter v__WDPQ.bsn    0     0).

The simulation period for my SWAT model is from 1998 to 2020, with a warm-up period of 6 years (1998–2003), since I'm calibrating the model from 2004 to 2016. Therefore, the total number of simulated years is 19 (1998–2016). There are 78 subbasins, but I only need 6 (q_7, q_9, q_12, q_22, q_26, q34 and q_45).

I’m not sure why this issue occurred, especially since the model ran fine for the monthly calibration. I suspect the problem might be related to my daily observed data, but I haven’t been able to identify it yet.

I’m attaching a .zip folder with all the necessary files. Please let me know if you need anything else or if you have any suggestions or advice. I’d really appreciate your help!