This is Akaka falls, near Hilo, Hawaii. At 800 feet, it is one of the tallest waterfalls in Hawaii. There are actually no permanently flowing rivers on the island, all the rivers are just driven by rainfall running off the mountains. Normally this waterfall is just a skinny little trickle of water. When I was there we had quite the winter storm with record breaking rainfall. When you break a rainfall record in a rainforest, that's saying something! We had 70 inches of rain in 3 days! Yes, seriously! This was taken right after the rain stopped, so it was flowing very nicely.
This photo was published as a black and white poster by Galaxy of Graphics a couple of years ago and is available in 3 different size poster prints. see
www.galaxyofgraphics.com/ArtistPrints.asp?ID=158 