As a river surfer surfing in Munich I'd love to see our river wave replicated more often. Rivers float 'for free' anyway. Why not just use its power whenever possible and reasonable?
Going to Munich - and not having heard about the downtown river wave - and then seeing people in wetsuits carrying their boards, dripping along the pavement:what, where, how!!!??? And then finding the wave and watching all the groms - and a couple of silver surfers - for a few glorious hours. And then my girlfriend (now wife) and I cycled up river, left our bikes and clothes and floated back down in our kecks. And then walked back to our bikes and clothes which were still there. Ahhhhh...European summers! And the naked people in the park...hahahahahah. Anywhere in the anglophone world you’d call the police if there were guys getting naked in the park...that is a great place!
River waves are just not comparable to ocean waves. The mechanics are different and so is the shape and power. I only know of one river wave that reliably stands up and curls and is big enough to surf, and that's on the corner of a huge hydraulic on the Zambezi River in Africa.
River waves also tend to be sensitive to flow, changing pretty dramatically (or even disappearing) with more or less water. There are plenty of river waves that attract surfers, like the Lachine waves near Montreal. But even at their best, they're not like ocean waves.
I've been thinking about this as well. I suspect recreating a Munich wave would be harder, perhaps much harder, to do than my imagination suggests. Topography, water volume and speed, to say nothing of access and permits etc. But I want one in my town.
Yeah, there is some risk. It's not the concrete on the side though but some rough rocks on the bottom which can be quite nasty... That's why locals refer beginners to the second wave in Munich which is located in Thalkirchen.
There are some river waves in Boise, Jackson Hole and a few minor ones, but the best are still in Canada, besides Munich, Austria, Swiss and France. As river surfer you don't really care for these expensive big machines, they are not sustainable. Like the Tokyo wave in the 80, which only lasted a few years.
https://youtu.be/fCJyyy97DyA