Measurable results, finally, for urban water harvesting -- thanks to data from Aaron Kauffman of Southwest Urban Hydrology! At Santa Fe Community College he measured volumetric water content in a control vs. treatment and he showed increase in water content in treatment all the way to 36 inches deep! This is very important finding as it indicates that water is going past the root zone of plants and all the way towards ground water. Check out Aaron's work at http://southwesturbanhydrology.com/