That's pretty neat. In Argentina it is common and in fact more common than not to have a cold water tank on the roofs of the houses, hidden on the upper floor, or hidden in the roof itself. The houses are often built with iron structure columns embedded in concrete and with hollow but structured ceramic bricks filling out the walls. Although in some regions where wood is more plentiful, trunks are used instead.
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The cold water tanks are located on top of the structural columns of a house or building. After all these tanks typically weigh multiple tons. Certainly this tank of yours would weigh about 40 metric tons when full. I doubt the typical roof could withstand that. So of course, the ground is where it had to be.
It seems like a very sound investment.
I find it very interesting to learn about the basic infrastructure and how it differs from place to place.
here we have multiple upright tanks connected to the sides of the house in order to collect rain water, an elevated tank for the water wells that gravity feeds to the house and then the overflow tank, that runs from the elevated tank, this feeds into the food gardens as well as the animals - and now the damsak... it might sound like a lot of water to store, but we live in a region with annual rainfall, so we have three wet months the entire year and it is necessary for sustainable living to harvest while we can.
The damsak comes in different sizes that can range between 500L to 200000L, so if one is needed to sit on a roof, I am sure you can find one suited for the job.
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200,000 L! A lake in a bag!
Haha pretty much