Further Problems With My Plumbing.
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For more on marking an answer as the "Best Answer", please visit our FAQ.In real money, you have 60 tonnes of water spread out over a 60 square metre foundation, giving a distributed load of about a tenth atmospheric pressure. This is only about one and a half pounds per square inch. As long as your soil is compacted, well drained with no underground streams/mines/cellars etc the foundation materials you describe should make a sturdy base. There will be no sideways forces so tying is not an issue like vertical walls.
No Diving!