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River surfing is the sport of surfing either standing waves, tidal bores or upstream waves in rivers. Claims for its origins include a 1955 ride of 2.4 km (1.5 mi) along the tidal bore of the River Severn .
The Lachine Rapids feature other two-metre breaks, including a wave further upriver near Lachine, known locally as Big Joe. [2] Corran Addison, an Olympic kayaker and three-time world freestyle kayak champion, was the first to surf the Habitat wave in 2002. His river-surfing school, Imagine Surfboards, has taught 3,500 students since 2005.
Boat crossing the rapids, ca. 1890. The first European to see the rapids was Jacques Cartier, who sailed up the St. Lawrence River in 1535, believing he had found the Northwest Passage. In 1611, Samuel de Champlain named the rapids Sault Saint-Louis, after a teenaged crewman named Louis who drowned here; the name later extended to Lac Saint-Louis.
Rapids cause water aeration of the stream or river, resulting in better water quality. [2] For a rapid to form, a necessary condition is the presence of a gradient, which refers to the river or stream's downward slope. When a river has a larger gradient, the water flows downhill faster. [3] Gradients are typically measured in feet per mile. [4]
At peak flows, standing waves, whitecaps, and whirlpools form at the rapids even in calm weather. The narrows are also the site of Skookumchuck Narrows Provincial Park . Each day, tides force large amounts of seawater through the narrows—760,000,000 m 3 (200 × 10 ^ 9 US gal) of water on a 3 m (9.8 ft) tide.
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Whitewater on the river Guil (French Alps) Whitewater on the small rapid of Kannonkoski, Central Finland Vivid water of the Torne River between Sweden and Finland. Whitewater at Yosemite. Whitewater forms in the context of rapids, in particular, when a river's gradient changes enough to generate so much turbulence that
A river is a natural freshwater stream that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of its course if it runs out of water, or only flow during certain seasons.