Portal:Rivers

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The Rivers Portal

A river is a natural stream of fresh water 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. Rivers are regulated by the water cycle, the processes by which water moves around the Earth. Water first enters rivers through precipitation, whether from rainfall, the runoff of water down a slope, the melting of glaciers or snow, or seepage from aquifers beneath the surface of the Earth.

Rivers flow in channeled watercourses and merge in confluences to form drainage basins, or catchments, areas where surface water eventually flows to a common outlet. Rivers have a great effect on the landscape around them. They may regularly overflow their banks and flood the surrounding area, spreading nutrients to the surrounding area. Sediment or alluvium carried by rivers shapes the landscape around it, forming deltas and islands where the flow slows down. Rivers rarely run in a straight line, instead, they bend or meander; the locations of a river's banks can change frequently. Rivers get their alluvium from erosion, which carves rock into canyons and valleys.

Rivers have sustained human and animal life for millennia, including the first human civilizations. The organisms that live around or in a river such as fish, aquatic plants, fungi, molluscs, and insects have different roles, including primary production, processing organic matter, predation, parasitism, and decomposition. Rivers have produced abundant resources for humans, including food, transportation, drinking water, and recreation. Humans have throughout history engineered rivers to prevent flooding, irrigate crops, perform work with water wheels, and produce hydroelectricity from dams. Since ancient times, people have associated rivers with life and fertility and have attached strong religious, political, social, and mythological elements to them. To this day, more than 90% of the human population lives within 10 miles of a river. (Full article...)

St. Johns River near Astor

The St. Johns River (Spanish: Río San Juan) is the longest river in the U.S. state of Florida and is the most significant one for commercial and recreational use. At 310 miles (500 km) long, it flows north and winds through or borders 12 counties. The drop in elevation from headwaters to mouth is less than 30 feet (9 m); like most Florida waterways, the St. Johns has a very slow flow speed of 0.3 mph (0.13 m/s), and is often described as "lazy".

Numerous lakes are formed by the river or flow into it, but as a river its widest point is nearly 3 miles (5 km) across. The narrowest point is in the headwaters, an unnavigable marsh in Indian River County. The St. Johns drainage basin of 8,840 square miles (22,900 km²) includes some of Florida's major wetlands. It is separated into three major basins and two associated watersheds for Lake George and the Ocklawaha River, all managed by the St. Johns River Water Management District. (Full article...)

List of selected articles

Briksdalselva River and the Briksdal glacier in Norway

The following are images from various river-related articles on Wikipedia.

Image 1Co-occurrence network of a bacterial community in a stream (from River ecosystem)
Image 2The Effra is one of the subterranean rivers of London. It empties into the Thames by Vauxhall Bridge, from which this photograph was taken. (from Subterranean river)
Image 3A pensive Cooplacurripa River, NSW (from River ecosystem)
Image 4Example of a river food web. Bacteria can be seen in the red box at the bottom. Bacteria (and other decomposers, like worms) decompose and recycle nutrients back to the habitat, which is shown by the light blue arrows. Without bacteria, the rest of the food web would starve, because there would not be enough nutrients for the animals higher up in the food web. The dark orange arrows show how some animals consume others in the food web. For example, lobsters may be eaten by humans. The dark blue arrows represent one complete food chain, beginning with the consumption of algae by the water flea, Daphnia, which is consumed by a small fish, which is consumed by a larger fish, which is at the end consumed by the great blue heron. (from River ecosystem)
Image 5Common water hyacinth in flower (from River ecosystem)
Image 6Map of the world showing elevation levels (from Upland and lowland)
Image 7Rafting is a watersport where buoyancy aids, helmets and wetsuits are mandatory and often imposed by law, due to the constant risk of falling off the boat and into the rapids (from Whitewater)
Image 8A weir on the River Calder, West Yorkshire (from River ecosystem)
Image 9This stream operating together with its environment can be thought of as forming a river ecosystem. (from River ecosystem)
Image 10A forest stream in the winter near Erzhausen, Germany (from River ecosystem)
Image 11Different biofilm components in streams. Principal components are algae and bacteria. (from River ecosystem)
Image 12Rapids in Mount Robson Provincial Park (from River ecosystem)
Image 13Periphyton (from River ecosystem)
Image 14The cave of source of the Buna can be entered by boat and dived through a cave system serving as an effluence of the Zalomka. (from Subterranean river)
Image 15Anthropogenic influences on river systems. Examples are mainly from settings with a modest technological influence, especially in the period of about 10,000 to 4000 cal yr BP. (from River ecosystem)
Image 16Cascade in the Pyrénées (from River ecosystem)
Image 17Pondweed is an autochthonous energy source. (from River ecosystem)
Image 18A whitewater canoe with yellow air bags. (from Whitewater)
Image 19Whitewater at Yosemite (from Whitewater)
Image 20Leaf litter is an allochthonous energy source. (from River ecosystem)
Image 21In Dante's Inferno, Charon ferries souls across the subterranean river Acheron. (from Subterranean river)
Image 22Devil's Throat Cave subterranean river from above (from Subterranean river)
Image 23Flowing rivers can act as dispersal vectors for plant matter and invertebrates. (from River ecosystem)
Image 24A subterranean river in the Cross Cave system of Slovenia. (Scale shown by people in photograph.) (from Subterranean river)
Image 25New Zealand longfin eels can weigh over 50 kilograms. (from River ecosystem)
Image 26The brook trout is native to small streams, creeks, lakes, and spring ponds. (from River ecosystem)
Image 27The Puerto Princesa cave can be entered by boat. (from Subterranean river)
Image 28Castle Geyser, Yellowstone National Park (from River ecosystem)

... that a tributary of the Chusovaya River (pictured) naturally dives underground for about 6 kilometres (3.7 mi)?
... that the Cheddar Yeo forms the largest underground river system in Britain?
... that the "Mad Raft Race" is an event held on the Chilkoot River as part of Fourth of July festivities observed in Haines, Alaska?

River Ness at Inverness

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Rivers

Categories by river

Rivers by city

Rivers by continent

Rivers by country

Rivers by mountain range

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Lists of rivers

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Whitewater sports

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River cruise companies

Sea and river deities

River deltas

Former rivers

Hebrew Bible rivers

Heritage Rivers

International rivers

River islands

Locks (water navigation)

River morphology

Mythological rivers

Personifications of rivers

River and lake piracy

Populated riverside places

River ports

River regulation

Riparian zone

Rivers with fish ladders

Sacred rivers

Shipwrecks in rivers

River surfing

Tidal bores

Transborder rivers

River valleys

Riverine warfare

Water-meadows

Works about rivers

River stubs

Wikipedia categories named after rivers

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Rivers, streams and springs
Rivers (lists)	Alluvial river Braided river Blackwater river Channel Channel pattern Channel types Confluence Distributary Drainage basin Subterranean river River bifurcation River ecosystem River source Tributary
Streams	Arroyo Beck Bourne Burn Chalk stream Coulee Current Stream bed Stream channel Streamflow Stream gradient Stream pool Perennial stream Winterbourne
Springs (list)	Estavelle/Inversac Geyser Holy well Hot spring list list in the US Karst spring list Mineral spring Ponor Rhythmic spring Spring horizon
Sedimentary processes and erosion	Abrasion Anabranch Aggradation Armor Bed load Bed material load Granular flow Debris flow Deposition Dissolved load Downcutting Erosion Headward erosion Knickpoint Palaeochannel Progradation Retrogradation Saltation Secondary flow Sediment transport Suspended load Wash load Water gap
Fluvial landforms	Ait Alluvial fan Antecedent drainage stream Avulsion Bank Bar Bayou Billabong Canyon Chine Cut bank Estuary Floating island Fluvial terrace Gill Gulch Gully Glen Meander scar Mouth bar Oxbow lake Riffle-pool sequence Point bar Ravine Rill River island Rock-cut basin Sedimentary basin Sedimentary structures Strath Thalweg River valley Wadi
Fluvial flow	Helicoidal flow International scale of river difficulty Log jam Meander Plunge pool Rapids Riffle Shoal Stream capture Waterfall list of waterfalls Whitewater
Surface runoff	Agricultural wastewater First flush Urban runoff
Floods and stormwater	100-year flood Crevasse splay Flash flood Flood Urban flooding Non-water flood Flood barrier Flood control Flood forecasting Flood-meadow Floodplain Flood pulse concept Flooded grasslands and savannas Inundation Storm Water Management Model Return period
Point source pollution	Effluent Industrial wastewater Sewage
River measurement and modelling	Baer's law Baseflow Bradshaw model Discharge (hydrology) Drainage density Exner equation Groundwater model Hack's law Hjulström curve Hydrograph Hydrological model Hydrological transport model Infiltration (hydrology) Main stem Playfair's law Relief ratio River Continuum Concept Rouse number Runoff curve number Runoff model (reservoir) Stream gauge Universal Soil Loss Equation WAFLEX Wetted perimeter Volumetric flow rate
River engineering	Aqueduct Balancing lake Canal Check dam Dam Drop structure Daylighting Detention basin Erosion control Fish ladder Floodplain restoration Flume Infiltration basin Leat Levee River morphology Retention basin Revetment Riparian-zone restoration Stream restoration Weir
River sports	Canyoning Fly fishing Rafting River surfing Riverboarding Stone skipping Triathlon Whitewater canoeing Whitewater kayaking Whitewater slalom
Related	Aquifer Aquatic toxicology Body of water Hydraulic civilization Limnology Riparian zone River valley civilization River cruise Sacred waters Surface water Wild river
Rivers by length Rivers by discharge rate Drainage basins Whitewater rivers Flash floods River name etymologies Countries without rivers

River morphology
Large-scale features	Alluvial plain Drainage basin Drainage system (geomorphology) Estuary Strahler number (stream order) River valley River delta River sinuosity
Alluvial rivers	Anabranch Avulsion (river) Bar (river morphology) Braided river Channel pattern Cut bank Floodplain Meander Meander cutoff Mouth bar Oxbow lake Point bar Riffle Rapids Riparian zone River bifurcation River channel migration River mouth Slip-off slope Stream pool Thalweg
Bedrock river	Canyon Knickpoint Plunge pool
Bedforms	Ait Antidune Dune Current ripple
Regional processes	Aggradation Base level Degradation (geology) Erosion and tectonics River rejuvenation
Mechanics	Deposition (geology) Water erosion Exner equation Hack's law Helicoidal flow Playfair's law Sediment transport List of rivers that have reversed direction
Category