delineation of rewetting("flooding") areas in slightly inclined ground?

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05-18-2021 10:21 PM
JohannesBierer
Regular Contributor

Hello,

I'm searching for the delineation of rewetting("flooding") areas in slightly inclined ground with a lot of small ditches with a lidar raster dem. In flat ground or near big rivers it is easy to calculate, but not in inclined areas with a lot of small ditches. If I define a flooding height in inclined ground it could be that in "highter" areas is looks quite well but in "lower" areas far away down the ditches the settlements are flooded. But it is unlikely that these areas would get in danger because of the seep away in the soil and the drain throught not closed ditches.
What I tried is hot spot analysis of the height values in small parts using the cold spots - this gives me somehow an image of the slope of the small parts ...
Next I used the block statistic to get raster cells under the mean value - but values under the mean are everywhere ...

Do you have any other idea? Or is there a tool I don't know?

I can use ArcMap 10.6 with spatial analyst, arcpy is possible?

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