Viewing post #864475 by Moonhowl

For most of the sites researched, the dripline is determined by the widest branch span. This first link gives the formula for critical root zone calculation, and includes a chart showing dripline info. I hope this helps.

http://www.extension.umn.edu/g...

http://treesandshrubs.about.co...

http://www.ehow.com/how_811608...

http://en.wikipedia.org/wiki/T...