How to build a waterfall into the pool (via return line)....

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Hello

I hope this is the most appropriate topic to post my request....

I am looking for any basic "how to" or tips & tricks, a website on how best to build a waterfall into the pool (via return line)....

Quick background:
Inground Swimming pool is in
Return line for waterfall is ready to go.
Pallets of flat rocks are on site.
My goal is a waterfall less than 3' high (nothing too big)

I can find a ton of "garden waterfalls" online but nothing on masonry techniques or example on building a swimming pool waterfall.

Any help, advice, links would be most appreciated.

Thanks,
Mitchman