Making a Waterfall

[sanddrag]

I need to make a waterfall. The water will begin falling at about 13 feet from the ground, be caught and spilled out again at 10 feet, again at 7 feet, and reach a final landing at 3 feet off the ground, where it will be collected and pumped back to the top. I'm looking for a flow in the range of about 6,000 GPH. I have selected a pump, but am having a little trouble with the rest of the components.

I was looking at one of these for the very top, but what I'm having trouble finding is something to cath it in and then release it again. I was thinking maybe there is something like this but with a wider spillway. Haven't found anything though. Should I build a wooden box and cover it in pond liner? I want all three falls to be somewhere in the range of about 24 inches wide.

Thanks.

EDIT: Rethought it, and perhaps I don't want the water to come out perfectly flat. But yeah, still looking for ideas on the "catch and release" part of it. It's hard to try out until I actually have the pump.