Hello Chris,
I had seen your 55 barrel system before at
http://rainharvester3.blogspot.com/ and thought a lot of it too.
I have a too much water problem curantly at my new home but think if I could trap off the roof that would keep it out of the yard. I have my eye out for a local source of barrels. I know dairys use them so I just need to make friends with a dairy farmer.
I can only imagine it is just as dry in the summer as wet in the winter here.