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manually. Where I live I think it's the firefighters who put them up BEFORE the actual flood happens and tear them down after it passed.
It requires preplanning of installation.
well, that's not what "mobile" means. It's just the opposite of "immobile", which this mobile wall isn't.
all of them. You remove the "planks" and the supports and it's gone, moved somewhere else. Thus "mobile".
in that case you simply make it higher.