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These activities require regular maintenance as the location of the river banks changes over time, floods bring foreign objects into the river, and natural sediment buildup continues. [22] Artificial channels are often constructed to "cut off" winding sections of a river with a shorter path, or to direct the flow of a river in a straighter ...
One highly variable component to river ecosystems is food supply (biomass of primary producers). [39] Food supply or type of producers is ever changing with the seasons and differing habitats within the river ecosystem. [39] Another highly variable component to river ecosystems is nutrient input from wetland and terrestrial detritus. [39]
A riverscape [1] (also called river landscape) [2] comprises the features of the landscape which can be found on and along a river. Most features of riverscapes include natural landforms (such as meanders and oxbow lakes) but they can also include artificial landforms (such as man-made levees and river groynes). Riverscapes can be divided into ...
Johnson Creek is a 25-mile (40 km) tributary of the Willamette River in the Portland metropolitan area of the U.S. state of Oregon.Part of the drainage basin of the Columbia River, its catchment consists of 54 square miles (140 km 2) of mostly urban land occupied by about 180,000 people as of 2012.
A stone near Crissolo, Italy, is inscribed, "Here is born the Po".. The United States Geological Survey (USGS) states that a river's "length may be considered to be the distance from the mouth to the most distant headwater source (irrespective of stream name), or from the mouth to the headwaters of the stream commonly known as the source stream".
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