Stream Channal error

[­조무빈 / 학생 / 환경설계학과]

Hello, I’m using SWAT to analyze Water Yield (WY) ecosystem services.

However, when I perform watershed delineation in SWAT, channels which is not actually exist are being mapped over roads. I’ve tried using different DEMs, but the same issue persists.

also, when I raised the channel threshold to suppress those channels, the stream threshold naturally increased as well, which caused the previously delineated watersheds to be underestimated.

Do you know any methods I could apply to fix this?

[Chris George]

You change the channel and stream thresholds independently, so
shortening channels does not automatically shorten streams. Also,
changing stream or channel thresholds will not change the size of the
watershed. The watershed is the area draining to the outlet.

You can improve the accuracy of channels and streams by burning in an
existing map, if you have one.

Chris

On 8/7/2025 7:55 AM, 조무빈 / 학생 / 환경설계학과 wrote:
> Hello, I’m using SWAT to analyze Water Yield (WY) ecosystem services.
> However, when I perform watershed delineation in SWAT, channels which is
> not actually exist are being mapped over roads. I’ve tried using
> different DEMs, but the same issue

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