This exhibit uses a river, waterfall, dam, or other natural water systems to demonstrate basic fluid flow, turbines, channel flow, streamlines, and turbulence. Through interaction with the exhibit, the child would be able to gain some basic knowledge of fluid mechanics. Also since the exhibit is more "natural," it would be easier for the child to relate to the concepts being taught. To make this exhibit more interactive, however, the child should be able to take water from a larger pool at the end of the river and pour it anywhere in the system. To see individual aspects, it would be beneficial to have the system start out on a higher level. This could be accomplished by either having the river start out as a stream coming down a mountain side or by having a waterfall which would turn a turbine at the bottom. The mountain stream could be stopped by a dam at the bottom and when enough pressure builds up, it would overflow or even "break." The waterfall itself could demonstrate the power a turbine produces from the water by powering a small light in a nearby lighthouse.
The next part of the exhibit would be the river that could demonstrate several concepts. For instance, the river would have varying widths in order to show channel flow and therefore have different velocities. There could also be rocks or other objects sticking out of the water to show streamlines and turbulence. To help illustrate these concepts more clearly, there could be various floating objects which could be placed in the river (i.e. floating ducks or boats). The river would empty out into a larger pool of water, something like a lake, where the water from which to start the river would be taken.