An infra-red image of a rather dry Dundaff Linn at New Lanark, Scotland. This is the third, and smallest of the waterfalls forming the Falls of Clyde. When I took this, most of the river flow was being diverted down the mill lade into New Lanark and the waterfall had practically no water flowing over it. Half an hour later, the lade sluice was closed and the water started flowing again but, by that time, I was back in my hotel room.
For the technically inclined...