I am unable to let you know the precise transition issue at which a shutter speed will become sluggish more than enough to outline your taking pictures as "prolonged exposure photography".
Conversely, perhaps the Picture you imagined has only one probable composition. It isn't really Repeated, nevertheless it can happen. So For those who have far more room you can also make smaller corrections so that every one the elements are in the body exactly where you want.
Waterfalls in many cases are in forests or deep canyons, so providing The here entire waterfall is while in the shade, you'll be able to accomplish a long exposure. If it's cloudy, you will have a pleasant even light.}