Trident Creek Falls is an unofficially named waterfall (I chose this name because it flows on Trident Creek) which splits up and looks like a trident as it enters Franz Josef Glacier Valley. There are actually numerous other unnamed waterfalls flowing in the Franz Josef Glacier Valley, but I singled out this one because it stands out with its unique shape and its flow.
For more information on this waterfall such as...
maps
directions
detailed descriptions
refer to A Guide to New Zealand Waterfalls (Story Nature Press).