Reservoir Placement for Wetlands

[Martha Ryan]

Hello QSWAT+ Community, 

I need to figure out where to place ponds/reservoirs in my watershed, and any advice would be appreciated. 

My watershed flows into an estuary, which I have denoted as a "lake". The sub-basins that border the estuary contain large wetlands, which I am hoping to denote as "reservoirs". 

I've placed outlets along all the major streams where the land portion of my watershed meets the estuary. I tried placing reservoirs in the same places as the selected outlets,  however, I received errors saying that the inlets/outlets I originally selected will be ignored because they don't have DSNODEIDs in the channel file. I then tried moving the reservoirs slightly upstream from the selected outlets, but I also received error messages saying that the placed reservoirs don't have any channel length and should be moved.    

I have included a rough sketch of my watershed and examples of the error messages below.

Please let me know if anyone has any thoughts. Thank you!

Best Regards,
Martha Ryan
UDEL PhD Candidate

[Tawan Charoenpittaya]

I'm not sure if I can explain this clearly, but I once encountered a similar issue. It seemed like, when placing reservoirs in the system, they had to be positioned on a streamline only. I had previously tried placing one on a channel, and it seemed to cause problems. So, I solved it by creating a new stream with a smaller threshold area, which allowed the streamlines to be drawn in more detail—and that made it possible to place the reservoir successfully.

Another possible issue is that you might have placed the reservoir overlapping with a lake. It seems the system is designed to support either letting you define a reservoir manually or using the "Add Lake" function—but not both at the same time. (In SWAT, a reservoir is considered a type of lake.)

ในวันที่ อ. 24 มิ.ย. 2025 เวลา 04:42 Martha Ryan <mart...@udel.edu> เขียนว่า:

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