>>2923321
> erosion
Water make big hole in stone at bottom. If you were to actually build it out of hard natural stone it’s not a big problem. But if use sand or clay or concrete it will collapse in no time, people use rocks with the joints sealed with ‘waterfall foam’.

> piano key
Google piano key weir

You need air in the water to get the foam/white water effect. The real waterfall gets it because the water is very turbulent and needs to fly so far. To get the same effect with a smaller one you may need to put the air in artificially, the Indian guy probably puts compressed air from the tanks into it.

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What would be the process to make something like this?