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I really don't want this post to turn into a dispute or semantics competition.
Water motion will result in other water motion. You can write the formula any number of ways: as pressure gradients, as particle to particle interaction due to shear forces, etc... It doesn't matter because in the end, the results are consistent.
The question here is whether the construction and materials used - concrete, sponge - stop this external water motion (due to pumps) from becoming internal water motion or whether it just slows it down as a function of the properties of the object.
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