natural
As I see it, there are six main types of watershapes: pools, spas, fountains, ponds, waterfalls and streams. Although there is tremendous variety within each category, I think most of us in the business would put pools, spas and fountains in one sub-group and ponds, waterfalls, and streams in another. Obviously, there's room for overlapping here - waterfalls installed with pools, for example, or fountains in the middle of ponds. The key distinction for me, however, is the closeness with which a pond, waterfall or stream must imitate