This is another waterfall located on the Roaring Fork Motor Nature Trail.
The National Park Service lists this waterfall in all of their brochures. Other than being accessible by car, it is nothing special. In fact if the weather is dry you may not see much at all. Visit in the early Spring for certain water flow and nice green moss.
You can reach the Roaring Fork Motor Nature Trail (closed in winter) by turning at traffic light #8 in Gatlinburg, TN. Follow this road into the park. The waterfall is at stop #15 on the self-guided car tour. For those who don't know, that would be towards the end of the loop.
Because of its small size and low water flow, a good tripod is essential. The picture above had a 10 second exposure and it needed every bit of it. I was there in the late afternoon and light conditions were good. It is a sheltered area on the north face as can be seen by the moss, so bad light should only be a problem in midday during the summertime.
Focal length - A normal-to-wide angle lens will be required to capture the entire area. You might also try taking several pictures of the area and stitching them together later.
I would also recommend the use of a polarizer to cut down on reflections and to improve the "greens" of the foliage. You will need to correct the color cast of the polarizer either with a warming filter or with post processing with a program like Photoshop.
Waterfall-Picture-Guide › Tennessee Waterfalls › Place Of A Thousand Drips