Yeah, we've got a couple of conduit gates like that at a lake here northeast of Tulsa. I think each tube passes about 10,000 cfs. And yeah, pretty sickening to watch the backwash.
But when they need to pass more than 20K cfs, they use
Runs pretty rarely - some years never. It's almost a ready-made whitewater park - lots of volume, bedrock bottom to easily anchor features into, and gradient. On private land, boater-friendly landowner (calls me when they turn it on and wants to see it run more often - how's that for boater-landowner relations?). Unfortunately, Corps of Engineers is NOT boater friendly there (yet). The way they treat us, you'd think we were selling crack to grade-schoolers.