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Good luck with the project and while I don't want to rain on the parade it seems to me the inground water tank "roof" might not be the ideal foundation for your pier.
I'm not expert and maybe others can comment but most choose a substantial concrete foorting on which to mount the pier. I think the top of the tank, which I presume is less than 200mm thick will be prone to flexure.
Is there a reason why you wouldn't just dig a hole and fill that with reinforced concrete?
In relation to the bollard - apart from being a bit low is it concrete filled? If not I would suggest filling it with concrete - that will reduce flexure.
As I say - don't want to dampen the spirits but would hate to see you go to great effort for an avergae result.
Hasten to add again - I'm no expert!
cheers
niko
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