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I am very keen on harvesting rain water, but have not been able to located an attractive above ground container that does not cost thousands of dollars. I am thinking of building my own out of galvanized corrugated roofing material.
I was thinking of running the panels vertically, overlapping and polyurethane caulking the joints, and creating a round container about 8' high. In addition to using screws on the joints, I would use cable to wrap around the container.
What has me hung up is the bottom and the top. I am unable to fabricate a metal round bottom, so I thought I would pour a concrete pad, just slightly larger than the cylinder, and then set the bottomless tank into the concrete while it was still wet. That way the bottom of the sides would sink into the concrete. I could then line the bottom of the tank with a water proof membrane, take that a little up the sides, and also cover all the joints.
Has anyone pulled off something like this?