Algodoo

This barely holds back anything! The water is mostly a box!

Someone should figure out how to design a series of one-way valves which would allow flood water to inflate the Aquadam, and then close before the water can drain out. That would obviate the need to fill the bladders with water in order to make them effective against flood water.

Hey, I love the idea.
Xray: Tesla has create a one way valve if I remember correctly. With no moving part. It may work here.

darkphenix - Yes, I recall reading about Tesla's one-way valve some time ago. It's not a perfect check-valve because it does allow water to flow with reduced velocity in the opposite direction which would probably be okay for this application. When the flood water recedes, the Aquadam will automatically deflate over time which is exactly what you would want it to do!

Statement: This barely holds back anything! The water is mostly a box!
Response: The force on a dam depends only on the depth of the water against the dam and not the volume of water that is held back by the dam. The boxes can be converted to water and the pressure against the dam will not change. I used boxes and circles as fillers in order to minimize lag.

wow its awsome good job on it C: