What the Helsinki?

Should the historically significant waterfall of a working museum power plant be preserved or should the dam be demolished to recreate one kilometer long rapids that once were at the location where Helsinki was originally founded?

There’s a very sad book about unique but demolished buildings in Helsinki. The significance of these buildings wasn’t always understood at the time.  I’d put the matter on hold to avoid a new tragedy.  Demolition is final but nature can wait another 10 years.