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.

IlanHavinga

Hi Pavan,

Was this issue resolved? It appears I am having the same issue using ArcMap 10.5.1. Applying the maximum depth figure from the MINUS tool output as the z value in the Fill function only produces the same as running the Fill tool without it.

Thanks,

Ilan