[bekko]

Wow, it must be parallel evolution SMG (http://www.iscid.org/encyclopedia/Parallel_Evolution) as I am coming to almost exactly the same configuration. The primary difference is that the shipping costs drives the price of that poly stock tank up to almost $1000 here. They stuff them diagonally into a container and then pack bags of feed and other farm supplies into the holes. I wanted an 8 foot cone bottom tank but that can not be purchased through the farm supply distributors so the shipping cost alone was going to be $1000 plus the $600 for the tank purchase. My more recent plan is to dig a cylindro-conical hole and throw in a welded-seam polyethylene liner. It won't be pretty, but it gets the price back to your $400. You can camouflage ugly, but you cannot camouflage expensive.

BTW, a friend of mine installed one of those blue flat-bottom poly stock tanks on a bowl-shaped concrete pad with a center drain. He got almost six inches of slope to the bottom of the "flat" bottom tank. Getting the center drain connected was a trick as he had all the neighbors and stacks of concrete blocks inside the tank to deform the bottom enough to screw on the bulkhead retaining nut.

steve hopkins