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A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features,[1] although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek,[2] but not always: the language is vague.[3] Rivers are part of the hydrological cycle. Water generally collects in a river from precipitation through a drainage basin from surface runoff and other sources such as groundwater recharge, springs, and the release of stored water in natural ice and snowpacks (e.g., from glaciers). Potamology is the scientific study of rivers, while limnology is the study of inland waters in general.

Contents

1 Topography

1.1 Subsurface streams 1.2 Permanence of flow

2 Classification

2.1 Topographical classification 2.2 Biotic classification 2.3 Whitewater
Whitewater
classification 2.4 Stream
Stream
order classification

3 Uses 4 Ecosystem 5 Chemistry 6 Brackish water 7 Flooding 8 Flow

8.1 Direction 8.2 Rate

9 Fluvial
Fluvial
erosion 10 Sediment
Sediment
yield 11 Management 12 See also 13 References 14 Further reading

Topography

Melting toe of Athabasca Glacier, Jasper National Park, Alberta, Canada

The Loboc River
River
in Bohol, Philippines

The Colorado River
Colorado River
at Horseshoe Bend, Arizona

A river begins at a source (or more often several sources), follows a path called a course, and ends at a mouth or mouths. The water in a river is usually confined to a channel, made up of a stream bed between banks. In larger rivers there is often also a wider floodplain shaped by flood-waters over-topping the channel. Floodplains may be very wide in relation to the size of the river channel. This distinction between river channel and floodplain can be blurred, especially in urban areas where the floodplain of a river channel can become greatly developed by housing and industry. Rivers can flow down mountains, through valleys (depressions) or along plains, and can create canyons or gorges. The term upriver (or upstream) refers to the direction towards the source of the river, i.e. against the direction of flow. Likewise, the term downriver (or downstream) describes the direction towards the mouth of the river, in which the current flows. The term left bank refers to the left bank in the direction of flow, right bank to the right. The river channel typically contains a single stream of water, but some rivers flow as several interconnecting streams of water, producing a braided river.[4] Extensive braided rivers are now found in only a few regions worldwide,[citation needed] such as the South Island of New Zealand. They also occur on peneplains and some of the larger river deltas. Anastamosing rivers are similar to braided rivers and are quite rare. They have multiple sinuous channels carrying large volumes of sediment. There are rare cases of river bifurcation in which a river divides and the resultant flows ending in different seas. An example is the bifurcation of Nerodime River
River
in Kosovo.

The River Cam
River Cam
from the Green Dragon Bridge, Cambridge (Britain)

A river flowing in its channel is a source of energy which acts on the river channel to change its shape and form. In 1757, the German hydrologist Albert Brahms empirically observed that the submerged weight of objects that may be carried away by a river is proportional to the sixth power of the river flow speed.[5] This formulation is also sometimes called Airy's law.[6] Thus, if the speed of flow is doubled, the flow would dislodge objects with 64 times as much submerged weight. In mountainous torrential zones this can be seen as erosion channels through hard rocks and the creation of sands and gravels from the destruction of larger rocks. A river valley that was created from a U-shaped glaciated valley, can often easily be identified by the V-shaped channel that it has carved. In the middle reaches where a river flows over flatter land, meanders may form through erosion of the river banks and deposition on the inside of bends. Sometimes the river will cut off a loop, shortening the channel and forming an oxbow lake or billabong. Rivers that carry large amounts of sediment may develop conspicuous deltas at their mouths. Rivers whose mouths are in saline tidal waters may form estuaries. Throughout the course of the river, the total volume of water transported downstream will often be a combination of the free water flow together with a substantial volume flowing through sub-surface rocks and gravels that underlie the river and its floodplain (called the hyporheic zone). For many rivers in large valleys, this unseen component of flow may greatly exceed the visible flow. Subsurface streams Most but not all rivers flow on the surface. Subterranean rivers flow underground in caves or caverns. Such rivers are frequently found in regions with limestone geologic formations. Subglacial streams are the braided rivers that flow at the beds of glaciers and ice sheets, permitting meltwater to be discharged at the front of the glacier. Because of the gradient in pressure due to the overlying weight of the glacier, such streams can even flow uphill. Permanence of flow Main article: Intermittent river An intermittent river (or ephemeral river) only flows occasionally and can be dry for several years at a time. These rivers are found in regions with limited or highly variable rainfall, or can occur because of geologic conditions such as a highly permeable river bed. Some ephemeral rivers flow during the summer months but not in the winter. Such rivers are typically fed from chalk aquifers which recharge from winter rainfall. In England these rivers are called bournes and give their name to places such as Bournemouth
Bournemouth
and Eastbourne. Even in humid regions, the location where flow begins in the smallest tributary streams generally moves upstream in response to precipitation and downstream in its absence or when active summer vegetation diverts water for evapotranspiration. Normally-dry rivers in arid zones are often identified as arroyos or other regional names. The meltwater from large hailstorms can create a slurry of water, hail and sand or soil, forming temporary rivers.[7] Classification

Nile
Nile
River
River
delta, as seen from Earth orbit. The Nile
Nile
is an example of a wave-dominated delta that has the classic Greek letter delta (Δ) shape after which river deltas were named.

A radar image of a 400-kilometre (250 mi) river of methane and ethane near the north pole of Saturn's moon Titan

Rivers have been classified by many criteria including their topography, their biotic status, and their relevance to white water rafting or canoeing activities. Topographical classification Rivers can generally be classified as either alluvial, bedrock, or some mix of the two. Alluvial rivers have channels and floodplains that are self-formed in unconsolidated or weakly consolidated sediments. They erode their banks and deposit material on bars and their floodplains. Bedrock rivers form when the river downcuts through the modern sediments and into the underlying bedrock. This occurs in regions that have experienced some kind of uplift (thereby steepening river gradients) or in which a particular hard lithology causes a river to have a steepened reach that has not been covered in modern alluvium. Bedrock rivers very often contain alluvium on their beds; this material is important in eroding and sculpting the channel. Rivers that go through patches of bedrock and patches of deep alluvial cover are classified as mixed bedrock-alluvial. Alluvial rivers can be further classified by their channel pattern as meandering, braided, wandering, anastomose, or straight. The morphology of an alluvial river reach is controlled by a combination of sediment supply, substrate composition, discharge, vegetation, and bed aggradation. At the start of the 20th century William Morris Davis
William Morris Davis
devised the "cycle of erosion" method of classifying rivers based on their "age". Although Davis's system is still found in many books today, after the 1950s and 1960s it became increasingly criticized and rejected by geomorphologists. His scheme did not produce testable hypotheses and was therefore deemed non-scientific.[8] Examples of Davis's river "ages" include:

Youthful river: A river with a steep gradient that has very few tributaries and flows quickly. Its channels erode deeper rather than wider. Examples are the Brazos, Trinity and Ebro rivers. Mature river: A river with a gradient that is less steep than those of youthful rivers and flows more slowly. A mature river is fed by many tributaries and has more discharge than a youthful river. Its channels erode wider rather than deeper. Examples are the Mississippi, Saint Lawrence, Danube, Ohio, Thames and Paraná rivers. Old river: A river with a low gradient and low erosive energy. Old rivers are characterized by flood plains. Examples are the Yellow, lower Ganges, Tigris, Euphrates, Indus and lower Nile
Nile
rivers. Rejuvenated river: A river with a gradient that is raised by tectonic uplift. Examples are the Rio Grande
Rio Grande
and Colorado River.

The ways in which a river's characteristics vary between its upper and lower course are summarized by the Bradshaw model. Power-law relationships between channel slope, depth, and width are given as a function of discharge by "river regime". Biotic classification There are several systems of classification based on biotic conditions typically assigning classes from the most oligotrophic or unpolluted through to the most eutrophic or polluted.[9] Other systems are based on a whole eco-system approach such as developed by the New Zealand Ministry for the Environment.[10] In Europe, the requirements of the Water Framework Directive has led to the development of a wide range of classification methods including classifications based on fishery status[11] A system of river zonation used in francophone communities[12][13] divides rivers into three primary zones:

The crenon is the uppermost zone at the source of the river. It is further divided into the eucrenon (spring or boil zone) and the hypocrenon (brook or headstream zone). These areas have low temperatures, reduced oxygen content and slow moving water. The rhithron is the upstream portion of the river that follows the crenon. It has relatively cool temperatures, high oxygen levels, and fast, turbulent, swift flow. The potamon is the remaining downstream stretch of river. It has warmer temperatures, lower oxygen levels, slow flow and sandier bottoms.

Whitewater
Whitewater
classification The International Scale of River Difficulty
International Scale of River Difficulty
is used to rate the challenges of navigation—particularly those with rapids. Class I is the easiest and Class VI is the hardest. Stream
Stream
order classification The Strahler Stream
Stream
Order ranks rivers based on the connectivity and hierarchy of contributing tributaries. Headwaters are first order while the Amazon River
Amazon River
is twelfth order. Approximately 80% of the rivers and streams in the world are of the first and second order. In certain languages, distinctions are made among rivers based on their stream order. In French, for example, rivers that run to the sea are called fleuve, while other rivers are called rivière. For example, in Canada, the Churchill River
River
in Manitoba
Manitoba
is called la rivière Churchill as it runs to Hudson Bay, but the Churchill River in Labrador
Labrador
is called le fleuve Churchill as it runs to the Atlantic Ocean. As most rivers in France are known by their names only without the word rivière or fleuve (e.g. la Seine, not le fleuve Seine, even though the Seine
Seine
is classed as a fleuve), one of the most prominent rivers in the Francophonie
Francophonie
commonly known as fleuve is le fleuve Saint-Laurent (the Saint Lawrence River). Since many fleuves are large and prominent, receiving many tributaries, the word is sometimes used to refer to certain large rivers that flow into other fleuves; however, even small streams that run to the sea are called fleuve (e.g. fleuve côtier, "coastal fleuve"). Uses

Leisure activities on the River
River
Avon at Avon Valley
Valley
Country Park, Keynsham, United Kingdom. A boat giving trips to the public passes a moored private boat.

Rivers have been used as a source of water, for obtaining food, for transport, as a defensive measure, as a source of hydropower to drive machinery, for bathing, and as a means of disposing of waste. Rivers have been used for navigation for thousands of years. The earliest evidence of navigation is found in the Indus Valley Civilization, which existed in northwestern India around 3300 BC.[14] Riverine navigation provides a cheap means of transport, and is still used extensively on most major rivers of the world like the Amazon, the Ganges, the Nile, the Mississippi, and the Indus. Since river boats are often not regulated, they contribute a large amount to global greenhouse gas emissions, and to local cancer due to inhaling of particulates emitted by the transports.[15][16] In some heavily forested regions such as Scandinavia
Scandinavia
and Canada, lumberjacks use the river to float felled trees downstream to lumber camps for further processing, saving much effort and cost by transporting the huge heavy logs by natural means. Rivers have been a source of food since pre-history.[17] They are often a rich source of fish and other edible aquatic life, and are a major source of fresh water, which can be used for drinking and irrigation. Most of the major cities of the world are situated on the banks of rivers. Rivers help to determine the urban form of cities and neighbourhoods and their corridors often present opportunities for urban renewal through the development of foreshoreways such as river walks. Rivers also provide an easy means of disposing of waste water and, in much of the less developed world, other wastes.

Watermill
Watermill
in Belgium

Fast flowing rivers and waterfalls are widely used as sources of energy, via watermills and hydroelectric plants. Evidence of watermills shows them in use for many hundreds of years, for instance in Orkney
Orkney
at Dounby Click Mill. Prior to the invention of steam power, watermills for grinding cereals and for processing wool and other textiles were common across Europe. In the 1890s the first machines to generate power from river water were established at places such as Cragside
Cragside
in Northumberland
Northumberland
and in recent decades there has been a significant increase in the development of large scale power generation from water, especially in wet mountainous regions such as Norway. The coarse sediments, gravel, and sand, generated and moved by rivers are extensively used in construction. In parts of the world this can generate extensive new lake habitats as gravel pits re-fill with water. In other circumstances it can destabilise the river bed and the course of the river and cause severe damage to spawning fish populations which rely on stable gravel formations for egg laying. In upland rivers, rapids with whitewater or even waterfalls occur. Rapids
Rapids
are often used for recreation, such as whitewater kayaking.[18] Rivers have been important in determining political boundaries and defending countries. For example, the Danube
Danube
was a long-standing border of the Roman Empire, and today it forms most of the border between Bulgaria
Bulgaria
and Romania. The Mississippi in North America
North America
and the Rhine
Rhine
in Europe
Europe
are major east-west boundaries in those continents. The Orange and Limpopo Rivers in southern Africa form the boundaries between provinces and countries along their routes. Ecosystem Main article: River
River
ecosystem The organisms in the riparian zone respond to changes in river channel location and patterns of flow. The ecosystem of rivers is generally described by the river continuum concept, which has some additions and refinements to allow for dams and waterfalls and temporary extensive flooding. The concept describes the river as a system in which the physical parameters, the availability of food particles and the composition of the ecosystem are continuously changing along its length. The food (energy) that remains from the upstream part is used downstream. The general pattern is that the first order streams contain particulate matter (decaying leaves from the surrounding forests) which is processed there by shredders like Plecoptera
Plecoptera
larvae. The products of these shredders are used by collectors, such as Hydropsychidae, and further downstream algae that create the primary production become the main food source of the organisms. All changes are gradual and the distribution of each species can be described as a normal curve, with the highest density where the conditions are optimal. In rivers succession is virtually absent and the composition of the ecosystem stays fixed in time. Chemistry Main article: River
River
chemistry The chemistry of rivers is complex and depends on inputs from the atmosphere, the geology through which it travels and the inputs from man's activities. The chemical composition of the water has a large impact on the ecology of that water for both plants and animals and it also affects the uses that may be made of the river water. Understanding and characterising river water chemistry requires a well designed and managed sampling and analysis. Brackish water Further information: Brackish water Some rivers generate brackish water by having their river mouth in the ocean. This, in effect creates a unique environment in which certain species are found. Flooding Main article: Flood

Flash flooding caused by a large amount of rain falling in a short amount of time

Flooding is a natural part of a river's cycle. The majority of the erosion of river channels and the erosion and deposition on the associated floodplains occur during the flood stage. In many developed areas, human activity has changed the form of river channels, altering magnitudes and frequencies of flooding. Some examples of this are the building of levees, the straightening of channels, and the draining of natural wetlands. In many cases human activities in rivers and floodplains have dramatically increased the risk of flooding. Straightening rivers allows water to flow more rapidly downstream, increasing the risk of flooding places further downstream. Building on flood plains removes flood storage, which again exacerbates downstream flooding. The building of levees only protects the area behind the levees and not those further downstream. Levees and flood-banks can also increase flooding upstream because of the back-water pressure as the river flow is impeded by the narrow channel banks. Flow Studying the flows of rivers is one aspect of hydrology.[19] Direction

River
River
meandering course

Rivers flow downhill with their power derived from gravity. The direction can involve all directions of the compass and can be a complex meandering path.[20][21][22] Rivers flowing downhill, from river source to river mouth, do not necessarily take the shortest path. For alluvial streams, straight and braided rivers have very low sinuosity and flow directly down hill, while meandering rivers flow from side to side across a valley. Bedrock rivers typically flow in either a fractal pattern, or a pattern that is determined by weaknesses in the bedrock, such as faults, fractures, or more erodible layers. Rate Main article: Streamflow Volumetric flow rate, also known as discharge, volume flow rate, and rate of water flow, is the volume of water which passes through a given cross-section of the river channel per unit time. It is typically measured in cubic metres per second (cumec) or cubic feet per second (cfs), where 1 m3/s = 35.51 ft3/s; it is sometimes also measured in litres or gallons per second. Volumetric flow rate
Volumetric flow rate
can be thought of as the mean velocity of the flow through a given cross-section, times that cross-sectional area. Mean velocity can be approximated through the use of the Law of the Wall. In general, velocity increases with the depth (or hydraulic radius) and slope of the river channel, while the cross-sectional area scales with the depth and the width: the double-counting of depth shows the importance of this variable in determining the discharge through the channel. Fluvial
Fluvial
erosion In the youthful stage; V-shaped valleys: example. River
River
Liffey, Dublin, Ireland. When the river is subject to vertical erosion, deepening the valley. Hydraulic action
Hydraulic action
loosens and dislodges the rock. The rivers load further erodes its banks and the river bed. Over time, this will deepen the river bed and create steeper sides which are then weathered. The steepened nature of the banks causes the sides of the valley to move downslope causing the valley to become V-Shaped. Waterfalls also form in the youthful river valley. example. Powerscourt Waterfall, County Wicklow, Ireland. Waterfalls usually form where a band of hard rock lies next to a layer of soft rock (easier to erode). Differential erosion occurs as the river can erode the soft rock easier than the hard rock, this leaves the hard rock more elevated and stands out from the river below. Hydraulic action
Hydraulic action
and abrasion are what erodes the soft rock and the water to fall down to the river bed. A plunge pool forms at the bottom and deepens as a result of hydraulic action and abrasion.[23] Sediment
Sediment
yield Sediment
Sediment
yield is the total quantity of particulate matter (suspended or bedload) reaching the outlet of a drainage basin over a fixed time frame. Yield is usually expressed as kilograms per square kilometre per year. Sediment
Sediment
delivery processes are affected by a myriad of factors such as drainage area size, basin slope, climate, sediment type (lithology), vegetation cover, and human land use / management practices. The theoretical concept of the 'sediment delivery ratio' (ratio between yield and total amount of sediment eroded) captures the fact that not all of the sediment is eroded within a certain catchment that reaches out to the outlet (due to, for example, deposition on floodplains). Such storage opportunities are typically increased in catchments of larger size, thus leading to a lower yield and sediment delivery ratio.

Frozen river in Alaska

Management

River
River
bank repair

Main article: River
River
engineering Rivers are often managed or controlled to make them more useful, or less disruptive, to human activity.

Dams or weirs may be built to control the flow, store water, or extract energy. Levees, known as dikes in Europe, may be built to prevent river water from flowing on floodplains or floodways. Canals connect rivers to one another for water transfer or navigation. River
River
courses may be modified to improve navigation, or straightened to increase the flow rate.

River
River
management is a continuous activity as rivers tend to 'undo' the modifications made by people. Dredged channels silt up, sluice mechanisms deteriorate with age, levees and dams may suffer seepage or catastrophic failure. The benefits sought through managing rivers may often be offset by the social and economic costs of mitigating the bad effects of such management. As an example, in parts of the developed world, rivers have been confined within channels to free up flat flood-plain land for development. Floods can inundate such development at high financial cost and often with loss of life. Rivers are increasingly managed for habitat conservation, as they are critical for many aquatic and riparian plants, resident and migratory fishes, waterfowl, birds of prey, migrating birds, and many mammals. See also

Environment portal Ecology portal

See also: geography, water cycle, and drainage basin

Arts, entertainment, and media

"Old Man River" The Riverkeepers (book)

General

Drought Fluvial Salt tide Water conflict

Crossings

Bridge Ferry Ford (crossing) Tunnel

Habitats

Exposed riverine sediments Riparian zone

Lists

Lists of rivers

List of international border rivers List of rivers by continent List of rivers by discharge List of rivers by length

List of waterways

Transport

Barge Raft River
River
transport Riverboat Sailing Steamboat Towpath

References

^ "GNIS FAQ". United States Geological Survey. Retrieved 26 January 2012.  ^ "WordNet Search: River". The Trustees of Princeton University. Retrieved 2 October 2009.  ^ "Domestic Names: Frequently Asked Question (FAQs), #17". United States Geological Survey. Retrieved 2 October 2009.  ^ Walther, John V. (15 February 2013). Earth's Natural Resources. Jones & Bartlett Publishers. ISBN 978-1-4496-3234-2.  ^ Garde, R. J. (1995). History of fluvial hydraulics. New Age Publishers. p. 14. ISBN 81-224-0815-X. OCLC 34628134.  ^ Garde, R. J. (1995). History of fluvial hydraulics. New Age Publishers. p. 19. ISBN 81-224-0815-X. OCLC 34628134.  ^ " Sand
Sand
River" in Iraq is actually a rapid movement of ice blocks. Tampabayreview.com. Retrieved on 14 July 2016. ^ Castree, Noel (2006). Questioning geography: fundamental debates. Wiley-Blackwell. pp. 84–85. ISBN 978-1-4051-0192-9.  ^ River
River
Classification scheme. sepa.org.uk ^ NZ’s River
River
Environment Classification system (REC). maf.govt.nz ^ Noble, Richard and Cowx, Ian et al. (May 2002) Compilation and harmonisation of fish species classification. University of Hull, UK. A project under the 5th Framework Programme Energy, Environment and Sustainable Management. Key Action 1: Sustainable Management and Quality of Water ^ Illies, J.; Botosaneanu, L. (1963). "Problémes et méthodes de la classification et de la zonation éologique des eaux courantes, considerées surtout du point de vue faunistique". Mitt. int. Ver. theor. angew. Limnol. 12: 1–57.  ^ Hawkes, H.A. (1975). River
River
zonation and classification. River ecology. Blackwell. pp. 312–374.  ^ "WWF – The World's Rivers". panda.org. ^ Meybeck, Michel (1993). "Riverine transport of atmospheric carbon: Sources, global typology and budget". Water, Air, & Soil Pollution. 70 (1–4): 443–463. doi:10.1007/BF01105015.  ^ Albrecht, Achim (2003). "Validating riverine transport and speciation models using nuclear reactor-derived radiocobalt". Journal of Environmental Radioactivity. Elsevier Science Ltd. 66 (3): 295–307. doi:10.1016/S0265-931X(02)00133-9. PMID 12600761.  ^ "National Museum of Prehistory-The Peinan Site-Settlements of the Prehistoric Times". nmp.gov.tw. ^ Draper, Nick; Hodgson, Christopher (2008-11-20). Adventure Sport Physiology. John Wiley & Sons. ISBN 978-0-470-31913-0.  ^ Cave, Cristi. "How a River
River
Flows". Stream
Stream
Biology and Ecology. Archived from the original on 1 January 2015.  ^ Rosenberg, Matt (8 June 2006). "Do All Rivers Flow South?". About.com.  ^ Rosenberg, Matt. "Rivers Flowing North: Rivers Only Flow Downhill; Rivers Do Not Prefer to Flow South". About.com.  ^ Rydell, Nezette (16 March 1997). "Re: What determines the direction of river flow? Elevation, Topography, Gravity??". Earth Sciences.  ^ "Landforms of the upper valley -". www.coolgeography.co.uk. Retrieved 2 December 2016. 

Further reading

The Wikibook Historical Geology has a page on the topic of: Rivers

Find more aboutriverat's sister projects

Definitions from Wiktionary Media from Wikimedia Commons News from Wikinews Quotations from Wikiquote Texts from Wikisource Textbooks from Wikibooks Learning resources from Wikiversity

Jeffrey W. Jacobs. "Rivers, Major World". Water Encyclopaedia.  Luna B. Leopold (1994). A View of the River. Harvard University Press. ISBN 0-674-93732-5. OCLC 28889034.  — a non-technical primer on the geomorphology and hydraulics of water. Middleton, Nick (2012). Rivers: a very short introduction. New York: Oxford University Press. ISBN 9780199588671. 

v t e

Rivers, streams and springs

Rivers

Alluvial river Braided river Blackwater river Channel Channel pattern Channel types Confluence Distributary Drainage basin Subterranean river River
River
bifurcation River
River
ecosystem River
River
source Tributary more...

Streams

Arroyo Bourne Burn Chalk stream Coulee Current Stream Stream
Stream
bed Stream
Stream
channel Stream
Stream
gradient Stream
Stream
pool Perennial stream Winterbourne more...

Springs

Geyser Sacred spring Hot spring Karst spring Mineral spring Rhythmic spring Spring Spring horizon more...

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
Sediment
transport Suspended load Wash load Water gap

Fluvial
Fluvial
landforms

Ait Alluvial fan Antecedent drainage stream Avulsion Bank Bar Bayou Billabong Canyon Chine Cut bank Estuary Fluvial
Fluvial
terrace Gill Gulch Gully Glen Meander
Meander
scar Mouth bar Oxbow lake Riffle-pool sequence Point bar Ravine Rill River
River
island Rock-cut basin Sedimentary basin Sedimentary structures Strath Thalweg River
River
valley Wadi

Fluvial
Fluvial
flow

Helicoidal flow International Scale of River
River
Difficulty Meander Plunge pool Rapids Riffle Shoal Waterfall Whitewater

Surface runoff

Agricultural wastewater treatment Effluent First flush Urban runoff Wastewater

Floods and stormwater

100-year flood Crevasse splay Flash flood Flood Flood
Flood
barrier Flood
Flood
control Flood
Flood
forecasting Flood-meadow Floodplain Flood
Flood
pulse concept Flooded grasslands and savannas Storm Water Management Model Return period

River
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 modelling Hydrological transport model Infiltration (hydrology) Main stem Playfair's Law Relief ratio River
River
continuum concept Rouse number Runoff curve number Runoff model (reservoir) Stream
Stream
gauge Universal Soil Loss Equation WAFLEX Wetted perimeter Volumetric flow rate

River
River
engineering

Aqueduct Balancing lake Canal Check dam Dam Drop structure Daylighting Detention basin Erosion
Erosion
control Fish ladder Floodplain
Floodplain
restoration Flume Infiltration basin Leat Levee Retention basin Revetment Riparian zone
Riparian zone
restoration Stream
Stream
restoration Weir

River
River
sports

Canyoning Rafting River
River
surfing Riverboarding Whitewater
Whitewater
canoeing Whitewater
Whitewater
kayaking Whitewater
Whitewater
slalom

Other topics

Aquifer Aquatic toxicology Body of water Limnology Riparian zone River
River
civilization River
River
cruise Surface water World Rivers Day

Lists of rivers Rivers by continent Rivers by length Rivers by discharge rate Drainage basins Whitewater
Whitewater
rivers Flash floods River
River
name etymologies

v t e

River
River
morphology

Large-scale features

Drainage basin Drainage system (geomorphology) Estuary Strahler number
Strahler number
(stream order) River
River
valley River
River
delta River
River
sinuosity

Alluvial rivers

Anabranch Avulsion (river) Bar (river morphology) Braided river Channel pattern Cut bank Floodplain Meander Meander
Meander
cutoff Mouth bar Oxbow lake Point bar Riffle Rapids Riparian zone River
River
bifurcation River
River
channel migration River
River
mouth Slip-off slope Stream
Stream
pool Thalweg

Bedrock river

Canyon Knickpoint Plunge pool

Bedforms

Ait Antidune Dune Current ripple

Regional processes

Aggradation Base level Degradation (geology) Erosion
Erosion
and tectonics River
River
rejuvenation

Mechanics

Deposition (geology) Water erosion Exner equation Hack's law Helicoidal flow Playfair's law Sediment
Sediment
transport

.