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Hope I didn't sound abrupt, but if I'm understanding you correctly, you're looking at a passageway between two fifteen foot tall retaining walls? Those walls will require engineering regardless of whether a waterfall is involved or not; when the engineer is designing the walls, make sure to let him/her know that you want to integrate a waterfeature. To get the effect that you want you're going to need a spillway running the entire length of the wall. The spillway is one thing, but you may also have an issue with the footer needing to change to accommodate the basin that receives and recirculates the water. If it were me (sounds like a badass project, by the way) I'd draw the conceptual drawing, including my best guess at a section view, and hand it off to my friendly neighborhood P.E. with the instructions to keep it cool looking but make it work.
You're talking about not just a commercial site, but a high-traffic commercial site where the end user will be pretty close to this to get the full effect. Your best bet is to come up with the ideas, get credit for the ideas (VERY important), and have someone with more specialized skills make it work.
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Dave
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