I have piping going thru roof of a building and exposed to wind. My roof elevation is 90'-0". In wind profile screen I am putting ground elevation at 90'-0". (it is done not to expose the pipe to wind below 90'-0"). However, my

I have piping going thru roof of a building and exposed to wind. My roof elevation is 90'-0". In wind profile screen I am putting ground elevation at 90'-0". (it is done not to expose the pipe to wind below 90'-0").  However, my question is whether AutoPIPE correctly calculates the wind pressure as it is dependent on elevation.  The concern is if my piping is at 100' elevation and since I put ground elevation as 90', does it take 10' as the elevation for calculating the wind pressure?