Subject: SWAT+ gwflow (rev. 62) - cannot add observation wells, gwflow.input missing, stream-aquifer exchange and abstraction outputs not working

[Gamze Yıldırım]

Hello,

I'm reporting an issue with the gwflow module in SWAT+ Editor v4.0.1 (rev. 62). We've run into several related problems, all pointing to gwflow outputs/interactions not working correctly in this version:

1) Stream-aquifer exchange does not respond to parameter changes. We raised streambed hydraulic conductivity (stream_K) to 0.5 m/day, but observed no measurable change in the stream-aquifer exchange output.

2) We were unable to add observation wells properly - the well entry process in SWAT+ Editor did not work as expected, and the gwflow.input file (where well definitions should be stored) does not exist at all in the TxtInOut folder.

3) As a consequence, gwflow_obs_mon.txt is always empty (1 KB, never updated since project setup) even though other gwflow monthly outputs (e.g. gwflow_basin_wb_mon.txt, gwflow_cell_wb_mon.txt) are correctly generated and updated after each run. As a workaround, we've been manually extracting head values for the relevant cells from gwflow_cell_wb_mon.txt instead.

4) Groundwater abstraction (pumping) produces no output either. We set up water-stress-triggered auto-irrigation from the aquifer on the relevant HRUs (plant water stress <0.99 threshold, 25 mm, up to 20 times/year) and confirmed the aquifer/cell linkage is correct, but gwflow_hru_pump_mon.txt stays at 1 KB and never records any pumping 

Has any of this been reported before, in particular the missing gwflow.input file and the well-entry issue? Any guidance on known issues or required settings for gwflow rev. 62 would be appreciated. I've shared a screenshot of the TxtInOut folder showing the file sizes/timestamps if useful.

Thank you.

Best regards

[Seifu kebede]

Let try it using SWAT+ Editor version 3.2.5 with rev. 61

Kind regards 

Seifu

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