If anyone is thinking about a way to move water upward, rather than using a pump you might use an Archimedes' Screw. It creates an interactive element for the visitor and might also be a great way to demonstrate the weight of water and how to get around it (show that water is hard to lift, but not with this clever structure).
http://en.wikipedia.org/wiki/Archimedes'_screw
one being used in an exhibit
http://www.tampabay.com/opinion/editorials/article1123920.ece
a simple homemade model
http://www.youtube.com/watch?v=NsAd7SlCpZ0
On a different note, here is a simple, interactive, and very applicable experiment that demonstrates erosion. Could be modified a bunch of different ways to be more interesting
https://www.youtube.com/watch?v=zE4j-vScBwo
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