Surfable man made river

It's a reservoir that fills up through a river I think, so it doesn't drain completely. And once you dig a small trench from the reservoir to the ocean, the water will do the rest of the work but it takes time for it to get that big
 
i remember seeing this video a long time ago and i was looking for it, now i know what its called!

thanks for reposting lol
 
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