by jrfosterjr » Fri May 16, 2008 2:31 pm
1. Create a polyline that defines the toe of the stockpile area.
2. Under 3D Data, select 2D to 3D polyline, then select By Surface Model
3. Select the existing surface to project to.
4. Under 3D Data, select 3D Polyline Utilities, Offset 3D polyline
5. When prompted, select Interval (if not default), enter 28 as your Horizontal offset (4 for slope times 7 for elevation change)
6. When prompted, select Vertical (if not default), enter 7 as your Vertical offset
You now have the top of the stockpile to create a surface from. Do note this, the top will not exactly reflect the surface below it, but the 7' will be based on the perimeter polyline. So, if the site is fairly uniform as you describe, you will have a reasonably close 7' high stockpile.
Hope this helps.
Jeff Foster, PE
Project Manager
Brooks Engineering Associates
Asheville, NC 28801