Alps rivers such as the Danube have major tributaries flowing into them that originate in the Alps. The Rhône is second to the Nile as a freshwater source to the Mediterranean Sea; the river begins as glacial meltwater, flows into Lake Geneva, and from there to France where one of its uses is to cool nuclear power plants. The Rhine originates in a 30 square kilometre area in Switzerland and represents almost 60 percent of water exported from the country. Tributary valleys, some of which are complicated, channel water to the main valleys which can experience flooding during the snow melt
Sol Duc River River rises near Bogachiel Peak and flows south of the Sol Duc River. The confluence of the two forms the Quillayute River. The Sol Duc flows generally west and northwest, collecting numerous headwater tributaries. Bridge Creek, which flows from Heart Lake in the high alpine Soleduck Park, joins the Sol Duc in Soleduck Flats. Rocky Creek flows from Mount Appleton near Appleton Pass, joining the Sol Duc from the north. Seven Lakes Creek flows from Seven Lakes Basin through several lakes including Soleduck Lake, to join the Sol Duc River from the south. The river plunges over Sol Duc Falls,