Pyramid bar height

Is it 30 inches till the bottom of the pipe, center of the pipe, or the top?
Look at the picture at this link for better understanding

It is thirty inches high to the center of the bar

Is it possible to get this clarified in the rules? How would I go about getting this done?

It’s pretty clear from the game specific drawings with some trig.

http://www.usfirst.org/sites/default/files/uploadedFiles/Robotics_Programs/FRC/Game_and_Season__Info/2013/2013_Game_Specific_Drawings.pdf

The game manual under Arena 2.2.5: http://www.usfirst.org/sites/default/files/uploadedFiles/Robotics_Programs/FRC/Game_and_Season__Info/2013/2013_Game_Specific_Drawings.pdf

Has a centerline at 30", 60", 90"

If your robot can’t deal with the difference in height between the bar being at 30" to the top or 30" to the middle, you need to reconsider your design. Field variation alone could affect that height.