Inflatable water dam - GIF

Inflatable water dam for flood control.

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Previously:

https://www.homemadetools.net/forum/...627#post143406
https://www.homemadetools.net/forum/...921#post133676
https://www.homemadetools.net/forum/...161#post134562
https://www.homemadetools.net/forum/...349#post122034

What holds it in place?

Water pressure I'd say.

So it is inflated with water not air, I would have said "water" filled not "inflated".