Water generally represents the unconscious and the emotions.
A waterfall is a positive dream symbol that suggests a cleansing of negative emotions or psychological issues. Just a simple visualization or a daydream of standing in a waterfall makes a person feel energized and refreshed.
If the waterfall in your dream is overwhelming or too powerful for you to enjoy, it may represent emotional energy and unconscious drives that are very difficult to effectively cope with on the conscious level. See also: Water... The Bedside Dream Dictionary
Dreams of a waterfall signify surrender, and that you are cleansing, purifying, and having a having an emotional catharsis. Also, a waterfall signifies that you will have a continuous stream of wealth and abundance.... Strangest Dream Explanations