FAILED TO MEET SOLVER CONVERGENCE and temporal variability in irrigation pumping

[Rajesh Khatakho]

Dear Sir,

Question 1: What is the reason behind the non-convergence of SWAT-MODFLOW after the daily time step of 283 in stress period 1? How do you suggest I could resolve this issue?

Question 2: In my current work, I used the average pumping rate for each well, which results in the same pumping throughout the simulation period. In the standalone MODFLOW model, irrigation pumping can be defined with varying monthly temporal rates. How can I define such temporal variations in pumping rates in the SWAT-MODFLOW coupling? Could you please share the sample file to address such temporal variability?

For your kind reference, I have attached the screenshots showing the model non-convergence from modflow.out, modflow.wel and the well data.

I look forward to your response.

With kind regards,

Rajesh Khatakho

University of Georgia, USA