Kent/Kentish chums will know the area around Smarden, which is very low down, and hosts several small streams which all meet up in a swathe of small rivers from Yalding southwards.
In October 2000, I tried to cross the area where the tiny R.Beult normally goes under a bridge, but on this occasion, it also went over the road near The Smarden Bell... When it reached the floor well, a worried Growster decided to bail out - literally, and just got everything up on the back shelf before the seats got soaked! The car was a write-off.
Respecting nature is something that should be taught, but the experience of being caught out by a tiny stream in full fury is one I'll never forget, hence the repeated post here!
Poor old Yalding has been clobbered yet again, and the areas around the Rother at Bodiam and Newenden are almost permanent wetlands now, which oddly enough, is the best way to manage the area!
But we don't have the sort of terrain you have John, if Japanese Knotweed wasn't such a pest when it breaks up on river banks, I'd plant a whole lot halfway up the hill and let it do its stuff there!