Looks like that would do the trick.
Edit: Ohh, I forgot my question. Is "river ownership" the same in the EU as it is in the UK. That "issue" of ownership is a real stumbling block. I mean, looks like it is what it is!
In my experience, it's unwise to try and prevent a citizen from navigating a river in France, Germany, Belgium, Spain, Italy, Scotland, or any other country in the EU with the exception of England and Wales.
In England and Wales, it's permissable to be abusive to strangers, so long as you have landowners consent.
As far as the Habitats Directive is concerned, most countries in the EU generally try and avoid complliance with the content because it's inconvenient and it costs a hell of a lot of money..
So nothing ever changes.
never try and teach a pig to sing .... it wastes your time and it annoys the pig