The University of Melbourne has been studying the use of rainwater capture for irrigating vegetable gardens:
http://www.theage.com.au/national/education/voice/turning-stormwater-into-food-20130404-2h91j.html
and
http://www.landfood.unimelb.edu.au/green/water.html#vegetable.
I thought this article was apropos given our discussions last night about community and school gardens:
3 1 6 0 N E W C A S T L E R D. , N E W C A S T L E
I came across another link today that I thought might be of interest to Placer Sustain members: