To Add Surface Legend Tables

You can create surface legend tables for all types of surface analysis, including directions, elevations, slopes, slope arrows, contours, and watersheds.

1. Generate the surface analysis that you are going to display in the legend table. See About Analyzing Surfaces.
   Note: You can control the display of the analysis in the drawing by adjusting the surface style Display settings.
2. To edit the styles for the tables, on the Settings tab, expand the Surface collection, expand the Table Styles collection, and select the collection for the type of legend that you want to add. In the Settings list view, right-click the style and click Edit.
3. To add the legend table, click Annotate tab Labels & Tables panel Add Tables menu Add Surface Legend Table.
4. Select the surface from the drawing area.
5. Enter the table type. Enter one of Directions, Elevations, Slopes, SlopeArrows, Contours, UserContours, or Watersheds.
6. Specify if you want the table to update automatically if the analysis information changes. Enter Dynamic to enable automatic updating.
7. Select the upper left-hand corner for the table in the drawing area.

Note: If you adjust a surface legend table to scale to fit into a viewport in a layout, the table scales up while not respecting the layout when plotted. Refer to About Scaling Labels in Drawings for more information.

About Scaling Labels in Drawings

Note: which seems caused by the difference of paper space and model space scaling but user are not aware there is a setting as outlined

Tutorial Exercise: Creating a Watershed Legend