Hello,

I am trying to define areas of slope greater than 40% that have a horizontal displacement greater than 25 ft.

I haven't found a way to set a vertical or horizontal limit with slope calculation and am hoping for some help to accomplish this.

If someone can give me some pointers on how this might be done I would be grateful!

Arcmap 10.2

Thanks!

Thanks much for the tips!

Cell size is 1ft so fairly straightforward.

I also got some hints elsewhere that led me to perform following general steps.

Now I had a raster of flow length only of steep slopes which I shaded with desired break values. Flow length is calculated along the slope starting from zero and counts up with each cell. This is fine but I need to define the whole region of the slope whenever the length is over the 25ft. Being this close, and since the area was limited enough, I just traced polygons over the appropriate regions using the flow direction arrows as a guide to defining the edges of the slope.

Perhaps you have better ideas of how to arrive at the end result like maybe a mathematical expression that would weed out the steep slope areas that didn't have the threshold length, but this worked well enough for me.