The majority of Tutuila is covered by tropical rainforests while about 15% of the land is used for agriculture. Flowing throughout the island’s catchments are numerous freshwater streams, approximately 160 on the island of Tutuila. Stream flow is often low and in some areas will disappear completely in the dry season. These streams, however, will quickly flood in response to heavy rainfall at other times of the year. Rainwater, from high up in the hills, seeps through the permeable volcanic rock and trickles slowly down. Each tributary joins with numerous others creating a mosaic of small channels across the landscape. Because the terrain is very steep, many streams are interspersed with impressive waterfalls, ranging from mellow trickles to thunderous cascades, until finally draining into the sea. |
