Viewing post #455993 by Moonhowl

My Grandma had one to supplement the well on her farm. The pump for the well was electric and if the power went off you could not use any of the taps in the house.
I found some info for you on a variety of sizes and uses.

http://www.earthsystemsnw.com/...

http://www.motherearthnews.com...

http://edis.ifas.ufl.edu/ae029

This pdf may be the most informative as it covers the Georgia Rainwater Collection Guidelines for the State of Georgia

http://www.ecy.wa.gov/programs...