create 20 foot contours from 10 meter DEM

[JamesS1]

Can anyone detail the steps in creating a contour layer with intervals of 20 feet from 10 meter resolution DEMs?

[DanPatterson_Retired]

10 m resolution has nothing to do with the Z values, just the X,Y cell size.
what are your Z values in? if they are in meters, then contour the data using the metric equivalent of 20 feet

[ChrisSnyder]

You could also use the "z-factor" parameter in the Contour tool to do the unit conversion (for example, from a DEM in meters to contours in feet). From meters to feet would be a z-factor of 3.2808 and of course the inverse would be 0.3048.