no, that was the 40,000th post on the carp forum.
I think a lot depends on food availability and angler pressure, pretty much the same as on lakes.
I had a carp from the lower Stour about 4 or 5 years ago that I fed for about 3 weeks before fishing for it.
I'd seen the carp in roughly the same area for a couple of weeks, so baited the spot for another 3.
I don't think that carp was particularly nomadic, there was available food and no angler pressure.
I'd say it was a resident fish to that certain section (maybe a 200 yd stretch) and it certainly wsn't a small fish, but there again, it isn't the Thames.
Just like lakes, I think river carp have their patrol routes around a certain section of river.
On smaller, more intimate rivers, that route may be only 50yds or so, but on waters like the Severn or Thames it could be many miles.