Creating a Depressionless DEM - Finding Sink Depth Problem

JohnKerkering1

Hello,

My DEM (SRTM 90m) has sinks, as made clear by the output of the Flow Direction and Sink tools. I can fill these sinks with the Fill tool with no problem.

But I wanted to take a more precise approach by following the "Finding Sink Depth" process as outlined on the page, "Creating a Depressionless DEM". I followed each of the 5 steps outlined and determined that the maximum sink depth was 33 meters, as the output of the Minus tool ranged from 1 to 33.

I ran the Fill tool on the original DEM and specified a z-limit of 33 and then ran Flow Direction on this output. The Flow Direction output was the same as the Flow Direction output from the original, un-filled DEM. In other words, the "Finding Sink Depth" approach didn't work, unless I missed a step or made a mistake somewhere in there.

Anyone encounter a similar problem? Any thoughts or guidance would be most welcome.

Thanks.

CharlesMorton

Were you able to resolve this issue?  I am having problems with the Fill tool not changing values, but only when I set a z-limit value.  Your issue may be related to this.
Charles