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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]
Streambed topography is the primary factor in creating rapids, and is generally consistent over time. Increased flow, as during a flood or high-rainfall season, can make permanent changes to the streambed by displacing rocks and boulders, by deposition of alluvium, or by creating new channels for flowing water.
Class III rapid at Canolfan Tryweryn, Wales. The international scale of river difficulty is an American system used to rate the difficulty of navigating a stretch of river, or a single (sometimes whitewater) rapid. [1] The scale was created by the American Whitewater Association to evaluate rivers throughout the world, hence international in ...
Cataracts of the Nile. The Cataracts of the Nile are shallow lengths (or whitewater rapids) of the Nile river, between Khartoum and Aswan, where the surface of the water is broken by many small boulders and stones jutting out of the river bed, as well as many rocky islets. In some places, these stretches are punctuated by whitewater, while at ...
The water table is the upper surface of the zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with groundwater, [1] which may be fresh, saline, or brackish, depending on the locality. It can also be simply explained as the depth below which the ground is saturated.
The Grand Canyon section of the Colorado River, like several other big-water Western rivers, uses a rapids scale developed by Otis R. Marston of 1–10 for rapids, 10 being the most difficult. The International Scale of River Difficulty, which classifies rapids from class I to VI, is more common elsewhere in the US and internationally.
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