On Mon, 15 Oct 2007 23:27:13 -0700, wrote Re
Home made rain water tank:

Here in Australia I live in an area that has no connection to mains
water. We have two corrugated galvanised metal water tanks that cost
approx $3000 each.

My family is growing and I need another.

A look at the construction and it appears to be quite simple, curved
metal that is riveted at the joins, these types of tanks have been in
rual areas for decades.

Just curious.
What are the dimensions of the tanks? How are the joints sealed to
prevent leakage? It seems like the joint seals would be crucial.