This is a brilliant technique for acquiring water when it refuses to fall from the sky, as it currently is doing in Central New Mexico. I have watched the rainfall amount in my region go from the "abundant" and "normal" yearly amount of 11 inches a year, last seen in 2007 with 10.22", from that high we have seen our yearly total dwindle...2008-8.36, 2009-6.67, 2010-8.94, 2011-4.7 and 2012-5.46.
I will be experimenting with various types of air wells to see what works best. If I can get a few established around my main trees and planting areas, I hope to reduce the well water I am currently expending to water these plantings and save on two fronts.
Thank you for the information. I am encouraged.