GWFlow crash: GW_FPLN_INFO subscript error after adding ISRIC/GLHYMPS and reservoirs

[Yashas Kumar H K]

Hello everyone,

I’m integrating the GWFlow module in my SWAT+ setup. For inputs, I used the ISRIC absolute depth to bedrock raster and the GLHYMPS permeability dataset, and I also added a reservoir shapefile via Add Lakes. The model builds, but the simulation fails with the following runtime error:

forrtl: severe (408): fort: (11): Subscript #1 of the array GW_FPLN_INFO has value 0 which is less than the lower bound 1
(calls: GWFLOW_READ → HYD_CONNECT → MAIN__)

Could you advise what typically causes this GWFlow floodplain/reservoir indexing error and how to resolve it? I suspect it may be related to polygon IDs or GWFlow connections.

Thank you!

[Nancy B. Sammons]

Yashas: 

I will take a look at this for you.  Please send your current txtinout.

Thank you,

Nancy

 

 

From: qswa...@googlegroups.com <qswa...@googlegroups.com> On Behalf Of Yashas Kumar H K
Sent: Tuesday, August 26, 2025 1:21 AM
To: QSWAT+ <qswa...@googlegroups.com>
Subject: [QSWAT+ User Group] GWFlow crash: GW_FPLN_INFO subscript error after adding ISRIC/GLHYMPS and reservoirs

 

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