River connection SWAT-MODFLOW

[Elhem Gandouzi]

Hello,

I created my SWAT-MODFLOW coupling files using ArcGIS and I’m running the simulations through the executable. When I check my GW–SW results, I notice that the interactions only occur for a few river reaches.

I’m attaching my coupling file and my MODFLOW .riv file for reference. Could you please help me understand why the river–groundwater interactions are limited to only some reaches?

Thank you in advance for your help.