Dr Virginia Stovin and Jeff Sorrill discuss the Green Roof Centre at Sheffield University. Sheffield has more green roofs than any other city in the UK. The Green Roof Centre is a national centre of excellence, working to promote green roof development and implementation through research, education, demonstration, information and technology transfer (http://www.researchatsheffield.co.uk).
http://www.thegreenroofcentre.co.uk/
I would be very interested in research into using grey water to irrigate green roofs in arid climates (clearly a process with two main benefits). Any chance you could make it happen? If you could simulate a frost-free environment, I anticipate that a mix of aloe vera subspecies would work well; they tolerate drought but will take water when it is there, survive in minimal volumes of substrate, breed rapidly and could be harvested every few years.
bowehj96 1 month ago