I have installed of a 2500 gallon rainwater storage tank on the shop. I built a pad by digging out a hole and placing compacted gravel in that space. I put in a layer of 3/4 inch pressure treated plywood on top of the gravel. This is what the tank will sit on. I connected the tank to the shop downspout with 4 inch ABS pipe. There is a first water reservoir and an overflow that connects to the old pipe that goes out into the yard. It has been raining and it seems to work.
Some of the tools used in this project
Cantilever Clamps: http://amzn.to/1TJmAFx
Milwaukee Sawzall: http://amzn.to/2r6vc6u
Milwaukee 18-volt Compact Drill: http://amzn.to/1sj855F
3M Peltor H10A Optime 105 Earmuff: http://amzn.to/1sj80iw
3M Reusable Respirator: http://amzn.to/2cGwyPL
3M Particulate Filter P100: http://amzn.to/2bYwhaK
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