Quote:
Originally Posted by pinballlooking
That is a great question. It has not moved in 2 years so I really don’t know. I just checked on it and it is still raised.
It did not go up any higher because the top went up to the grow bed and the grow bed stopped it from going any higher.
It is crazy it was able to move it.
I would have never thought it could have moved when full of water.
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Was it really full of water? I bet it wasn't.
Do this go fill up your sink and then take a cup and fill it about 3/4 full of water. Gently place it bottom down in the water. Does it still float? (the answer is yes). It's not weight that matters but density. That tank even with it being full of water is less dense than the amount of water it can displace, therefore it will get pushed up. The trick to keep them from popping out of the ground is to make sure the water level is always above the ground water level. For most places this means probably an inch or so above the ground (because lets be honest there can be a bit of standing water before it percolates through the ground).