topic Re: Watershed Tool Troubleshooting in ArcGIS Pro Questions

Watershed Tool Troubleshooting

ThiPham12 — Tue, 23 Nov 2021 19:45:27 GMT

Hi Everyone,

I created a set of watersheds using a set of pourpoints raster, which have been snapped to the location of highest accumulation using the snap pourpoint tool and the Watershed tool. When I generated the watershed, one of the watersheds has void spaces within the watershed. I was wondering if anyone have faced this problem before and how you resolved it? I attached a picture of the watershed below.

Re: Watershed Tool Troubleshooting

DanPatterson — Tue, 23 Nov 2021 21:31:15 GMT

Did you fill "sinks" before running the flow direction tool? Do you have a depressionless dem?

How Flow Direction works—ArcGIS Pro | Documentation

Creating a depressionless DEM—ArcGIS Pro | Documentation

Re: Watershed Tool Troubleshooting

tzz_12 — Mon, 29 Nov 2021 17:25:08 GMT

After using the fill tool with the directional raster, there were six instances of sinks filled-in. However, the resulting dem raster is not located where the original dem is located but at Hudson Bay. I am wonder how I am using the fill tool incorrectly? Thanks for your help!

Re: Watershed Tool Troubleshooting

DanPatterson — Mon, 29 Nov 2021 17:54:16 GMT

I suspect your map and input files and output file were in different coordinate systems, use the Environments tab on tools to make sure you get your coordinate systems correct

Re: Watershed Tool Troubleshooting

ThiPham12 — Mon, 06 Dec 2021 16:56:53 GMT

Hi Dan,
I was able to successfully use the fill tool on my original raster, but there was no depression found. Do you know if the fill tool should also work on a directional raster? If there is no depression, do you have other ideas of what may have caused the void spaces in the watershed? I was wondering, is there a tool to fill in void spaces in a polygon?

Thank you so much for your help!

Re: Watershed Tool Troubleshooting

Anonymous User — Fri, 28 Apr 2023 08:40:16 GMT

Good day

Used the d8 flow direction from a 5m dem to create the watershed, but it calculated only 1 bock or a small area around the stream. A can see the watershed must be a lot bigger with the stream data I have.