Rain water harvesting is by no means a new technology. Growing up, I remember rain water tubs sitting near my grandmother's front porch as permanent fixtures. Grandma's ground well went dry long before I can remember, so rain water was her source of water for dishwashing, hair washing, and flushing the toilet. It was many years later, after I had left home, that Grandma finally had a new well put down, but until that time a bucket full of rain water worked just fine for flushing her toilet. Grandma continued to collect rain water after the new well was put down. I guess old habits die hard or perhaps it was just sustainable thinking on Grandma's part.