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{{Short description|Body of surface water flowing down a channel}}{{Redirect|Rivulet|the moth|Perizoma affinitata{{!}}Rivulet (moth)|the musician|Rivulets}}{{Other uses}}{{pp-move-indef}}{{Merge from|Perennial stream|discuss=Talk:Stream#Proposed merge of Perennial stream into Stream|date=December 2023}}(File:Potok pod jezerom 1.jpg|thumb|upright|Rocky stream in Italy)File:Frozen stream Enäjärvi, Pori.JPG|thumb|upright|Frozen stream in Enäjärvi, PoriPoriFile:Dranse de Montriond 09.jpg|thumb|Stream near MontriondMontriondFile:Aubach (Wiehl) nahe dem Weiherdamm in Wildbergerhütte.jpg|thumb|Aubach (Wiehl) in North Rhine-WestphaliaNorth Rhine-WestphaliaA stream is a continuous body of surface waterBOOK, Hydrologic Definitions: Stream, Manual of Hydrology: Part 1. General Surface-Water Techniques, Water Supply Paper 1541-A, Langbein, W.B., Iseri, Kathleen T., 1995, USGS, Reston, VA,weblink live,weblink" title="web.archive.org/web/20120509220533weblink">weblink 2012-05-09, flowing within the bed and banks of a channel. Depending on its location or certain characteristics, a stream may be referred to by a variety of local or regional names. Long, large streams are usually called rivers, while smaller, less voluminous and more intermittent streams are known as streamlets, brooks or creeks.The flow of a stream is controlled by three inputs – surface runoff (from precipitation or meltwater), daylighted subterranean water, and surfaced groundwater (spring water). The surface and subterranean water are highly variable between periods of rainfall. Groundwater, on the other hand, has a relatively constant input and is controlled more by long-term patterns of precipitation.WEB, Basic Biology, 16 January 2016, River,weblink The stream encompasses surface, subsurface and groundwater fluxes that respond to geological, geomorphological, hydrological and biotic controls.Alexander, L. C., Autrey, B., DeMeester, J., Fritz, K. M., Golden, H. E., Goodrich, D. C., ... & McManus, M. G. (2015). Connectivity of streams and wetlands to downstream waters: review and synthesis of the scientific evidence (Vol. 475). EPA/600/R-14.Streams are important as conduits in the water cycle, instruments in groundwater recharge, and corridors for fish and wildlife migration. The biological habitat in the immediate vicinity of a stream is called a riparian zone. Given the status of the ongoing Holocene extinction, streams play an important corridor role in connecting fragmented habitats and thus in conserving biodiversity. The study of streams and waterways in general is known as surface hydrology and is a core element of environmental geography."What is hydrology and what do hydrologists do?" {{webarchive|url=https://web.archive.org/web/20140222131644weblink |date=2014-02-22 }} U.S. Geological Survey (USGS). Atlanta, GA. 2009-05-13.

Types

File:Creek babbling through Benvoulin wetlands.webm|thumb|Creek babbling through Benvoulin, Canada, wetlands]]File:WymingBrook.jpg|thumb|Wyming Brook in SheffieldSheffieldFile:Parramattastream.jpg|thumb|A small stream in Lake Parramatta, SydneySydneyFile:Bach Isenach.jpg|thumb|upright|Stream with low gradient surrounded by natural riparian vegetation (Rhineland-PalatinateRhineland-PalatinateFile:Stevens Creek Tributary A in Macon County, IL.jpg|thumb|upright|A low level stream in Macon County, IllinoisIllinois

Brook

A stream smaller than a creek, especially one that is fed by a spring or seep. It is usually small and easily forded. A brook is characterised by its shallowness.

Creek

A creek ({{IPAc-en|k|r|iː|k|}}) or crick ({{IPAc-en|k|r|ɪ|k|}}):WEB, creek, Dictionary.com, LLC, kreek, krik, dictionary.com,weblink 16 May 2019, WEB, crick, Northern, North Midland, and Western U.S., English Oxford Living Dictionaries, Oxford University Press,weblinkweblink dead, May 18, 2019, 18 May 2019,

• In Australia, Canada, New Zealand and the United States, a (narrow) stream that is smaller than a river; a minor tributary of a river; a brook.{{refn|WEB, creek, British...especially an inlet...(whereas) NZ, North American, Australian...stream or minor tributary., oxforddictionaries.com, Oxford University Press,weblinkweblink dead, September 24, 2016, 18 May 2019, WEB, (US) creek, North American, Australian, NZ...A stream, brook, or minor tributary of a river., English Oxford Living Dictionaries, Oxford University Press,weblinkweblink dead, September 24, 2016, 18 May 2019, WEB, creek, U.S., Canada , and Australia…a stream smaller than a river., Dictionary.com, Dictionary.com, LLC,weblink 18 May 2019, WEB, creek, US, Canadian, Australian and New Zealand a small stream or tributary, Collins Dictionary,weblink 18 May 2019, WEB, creek, a narrow stream, Macmillan Dictionary, Springer Nature Limited,weblink 18 May 2019, }} Sometimes navigable by water craft and may be intermittent.
• In the United Kingdom, India, and parts of Maryland, New England,Spruce Creek Association. Kittery, ME. "About the Spruce Creek Watershed." {{webarchive|url=https://web.archive.org/web/20080703211312weblink |date=2008-07-03 }} Accessed 2010-10-02. a tidal inlet, typically in a salt marsh or mangrove swamp, or between enclosed and drained former salt marshes or swamps (e.g. Portsbridge Creek separating Portsea Island from the mainland). In these cases, the "stream" is the tidal stream, the course of the seawater through the creek channel at low and high tide.

River

A river is a large natural stream that is much wider and deeper than a creek and not easily fordable, and may be a navigable waterway.BOOK, Limnology: Lake and river ecosystems, Wetzel, Robert G., 2001, Academic Press, 978-0127447605, 3rd, San Diego, 46393244,

Runnel

The linear channel between the parallel ridges or bars on a shoreline beach or river floodplain, or between a bar and the shore. Also called a swale.

Tributary

A tributary is a contributory stream to a larger stream, or a stream which does not reach a static body of water such as a lake, bay or oceanBOOK, Krebs, Robert E., The Basics of Earth Science, Greenwood Publishing Group, 2003, 978-0-313-31930-3,weblink but joins another river (a parent river). Sometimes also called a branch or fork.Bisson, Peter and Wondzell, Steven. "Olympic Experimental State Forest Synthesis of Riparian Research and Monitoring" {{Webarchive|url=https://web.archive.org/web/20220813122142weblink |date=2022-08-13 }}, United States Forest Service, p. 15 (December 1, 2009).

Distributary

A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel, and the phenomenon is known as river bifurcation. Distributaries are common features of river deltas, and are often found where a valleyed stream enters wide flatlands or approaches the coastal plains around a lake or an ocean. They can also occur inland, on alluvial fans, or where a tributary stream bifurcates as it nears its confluence with a larger stream. Common terms for individual river distributaries in English-speaking countries are arm and channel.

Other names

There are a number of regional names for a stream.

Northern America

• Branch is used to name streams in Maryland and Virginia.WEB, OED Online -Branch, June 2017, Oxford University Press.,weblink 6 July 2017,
• Creek is common throughout the United States, as well as Australia.
• Falls is also used to name streams in Maryland, for streams/rivers which have waterfalls on them, even if such falls only have a small vertical drop. Little Gunpowder Falls and the Jones Falls are actually rivers named in this manner, unique to Maryland.{{citation needed|date=November 2015}}
• Kill in New York, Pennsylvania, Delaware, and New Jersey comes from a Dutch language word meaning "riverbed" or "water channel", and can also be used for the UK meaning of 'creek'.
• Run in Ohio, Maryland, Michigan, New Jersey, Pennsylvania, Virginia, or West Virginia can be the name of a stream.WEB, Derek Watkin's USGS Analysis, 25 July 2011,weblink 26 November 2018,
• Run in Florida is the name given to streams coming out of small natural springs.JOURNAL, Steigerwalt, Nancy M., Cichra, Charles E., Baker, Shirley M., 2008, Composition and Distribution of Aquatic Invertebrate Communities on Snags in a North Central Florida, USA, Spring-Run Stream, Florida Scientist, 71, 3, 273–286, 24321406

, River is used for streams from larger springs like the Silver River and Rainbow River.

• Stream and brook are used in Midwestern states, Mid-Atlantic states, and New England.

United Kingdom

• Allt is used in the Scottish Highlands.{{citation needed|date=November 2015}}
• Beck is used in Lincolnshire to Cumbria in areas which were once occupied by the Danes and Norwegians.WEB, OED Online – Beck, June 2017, Oxford University Press.,weblink 6 July 2017,
• Bourne or winterbourne is used in the chalk downland of southern England for ephemeral rivers.WEB, OED Online – Bourne, June 2017, Oxford University Press.,weblink 6 July 2017, When permanent, they are chalk streams.
• Brook.WEB, OED Online – Brook, June 2017, Oxford University Press.,weblink 6 July 2017,
• Burn is used in Scotland and North East England.WEB, OED Online – Burn, June 2017, Oxford University Press.,weblink 6 July 2017,
• Gill or ghyll is seen in the north of England and Kent and Surrey influenced by Old Norse. The variant "ghyll" is used in the Lake District and appears to have been an invention of William Wordsworth.WEB, OED Online – Gill, June 2017, Oxford University Press.,weblink 6 July 2017,
• Nant is used in Wales.WEB, OED Online – Nant, June 2017, Oxford University Press.,weblink 6 July 2017,
• Rivulet is a term encountered in Victorian era publications.WEB, OED Online – Rivulet, June 2017, Oxford University Press.,weblink 6 July 2017,
• Syke is used in the Scottish Lowlands and Cumbria for a seasonal stream.WEB, OED Online – Sike, June 2017, Oxford University Press.,weblink 6 July 2017,

Related terminology

Bar: A shoal that develops in a stream as sediment is deposited as the current slows or is impeded by wave action at the confluence.

Bifurcation: A fork into two or more streams.

Channel: A depression created by constant erosion that carries the stream's flow.

Confluence: The point at which the two streams merge. If the two tributaries are of approximately equal size, the confluence may be called a fork.

Drainage basin: (also known as a watershed in the United States) The area of land where water flows into a stream. A large drainage basin such as the Amazon River contains many smaller drainage basins.

Floodplain: Lands adjacent to the stream that are subject to flooding when a stream overflows its banks.WEB, USGS Water Science Glossary of Terms,weblink United States Geological Survey, 26 November 2018,

Headwaters or source: The part of a stream or river proximate to its source. The word is most commonly used in the plural where there is no single point source.

Knickpoint: The point on a stream's profile where a sudden change in stream gradient occurs.

Mouth: The point at which the stream discharges, possibly via an estuary or delta, into a static body of water such as a lake or ocean.

Pool: A segment where the water is deeper and slower moving.

Rapids: A turbulent, fast-flowing stretch of a stream or river.

Riffle: A segment where the flow is shallower and more turbulent.

River: A large natural stream, which may be a waterway.

Run: A somewhat smoothly flowing segment of the stream.

Spring: The point at which a stream emerges from an underground course through unconsolidated sediments or through caves. A stream can, especially with caves, flow aboveground for part of its course, and underground for part of its course.

Stream bed: The bottom of a stream.

Stream corridor: Stream, its floodplains, and the transitional upland fringe"Stream Corridor Structure" {{webarchive|url=https://web.archive.org/web/20150402161646weblink |date=2015-04-02 }} Adapted from ''Stream Corridor Restoration: Principles, Processes, and Practices

Streamflow: The water moving through a stream channel.: Stream gauge: A site along the route of a stream or river, used for reference marking or water monitoring.

Thalweg: The river's longitudinal section, or the line joining the deepest point in the channel at each stage from source to mouth.

Watercourse: The channel followed by a stream (a flowing body of water)JOURNAL, Shannonhouse, Royal G., Some Principles of Water Law in the Southeast, Mercer Law Review, 1961, 13, 344, or the stream itself.WEB, Definition of WATERCOURSE, Merriam-Webster, 2022-03-18,weblink 2022-04-05, WEB, watercourse, definition in the Cambridge English Dictionary, 2016-03-07,weblink 2022-04-05, WEB, Lewis, Roy, Hilton, John Buxton, Fallon, Jennifer, Watercourse definition and meaning, Collins English Dictionary, 2022-04-05,weblink 2022-04-05, In the UK, some aspects of criminal law, such as the Rivers (Prevention of Pollution) Act 1951, specify that a watercourse includes those rivers which are dry for part of the year.WEB,weblink legislation.gov.uk, Rivers (Prevention of Pollution) Act 1951, 25 August 2016, In some jurisdictions, owners of land over which the water flows may have the legal right to use or retain some or much of that water.JOURNAL, Jones, J.G., Water Rights in Louisiana, Louisiana Law Review, 1965, 16, 3, 500, This right may extend to estuaries, rivers, streams, anabranchesJOURNAL, North, Colin P., Recognition of the Sedimentary Architecture of Dryland Anabranching (Anastomosing) Rivers, Journal of Sedimentary Research, 2007, 77, 11, 925–938,weblink 10.2110/jsr.2007.089, 2007JSedR..77..925N, and canals.WEB,weblinkweblink" title="web.archive.org/web/20170707200513weblink">weblink 2017-07-07, Watercourse, FEMA, 2017-12-15,

Waterfall or cascade: The fall of water where the stream goes over a sudden drop called a knickpoint; some knickpoints are formed by erosion when water flows over an especially resistant stratum, followed by one less so. The stream expends kinetic energy in "trying" to eliminate the knickpoint.

Wetted perimeter: The line on which the stream's surface meets the channel walls.

Sources

File:Homesteadcreekflowers.jpg|thumb|upright|Small tributary stream, Diamond Ridge, Alaska]]File:creek in perisher.jpg|thumb| Creek in Perisher Ski ResortPerisher Ski ResortA stream's source depends on the surrounding landscape and its function within larger river networks. While perennial and intermittent streams are typically supplied by smaller upstream waters and groundwater, headwater and ephemeral streams often derive most of their water from precipitation in the form of rain and snow.WEB, Streams {{!, Rivers & Streams {{!}} US EPA|url=https://archive.epa.gov/water/archive/web/html/streams.html|access-date=2021-10-14|website=archive.epa.gov}} Most of this precipitated water re-enters the atmosphere by evaporation from soil and water bodies, or by the evapotranspiration of plants. Some of the water proceeds to sink into the earth by infiltration and becomes groundwater, much of which eventually enters streams. Some precipitated water is temporarily locked up in snow fields and glaciers, to be released later by evaporation or melting. The rest of the water flows off the land as runoff, the proportion of which varies according to many factors, such as wind, humidity, vegetation, rock types, and relief. This runoff starts as a thin film called sheet wash, combined with a network of tiny rills, together constituting sheet runoff; when this water is concentrated in a channel, a stream has its birth. Some creeks may start from ponds or lakes.File:Bluerock Creek, Alberta.jpg|thumb|Stream in AlbertaAlberta

Characteristics

Ranking

To qualify as a stream, a body of water must be either recurring or perennial. Recurring (intermittent) streams have water in the channel for at least part of the year. A stream of the first order is a stream which does not have any other recurring or perennial stream feeding into it. When two first-order streams come together, they form a second-order stream. When two second-order streams come together, they form a third-order stream. Streams of lower order joining a higher order stream do not change the order of the higher stream.

Gradient

The gradient of a stream is a critical factor in determining its character and is entirely determined by its base level of erosion. The base level of erosion is the point at which the stream either enters the ocean, a lake or pond, or enters a stretch in which it has a much lower gradient, and may be specifically applied to any particular stretch of a stream.In geological terms, the stream will erode down through its bed to achieve the base level of erosion throughout its course. If this base level is low, then the stream will rapidly cut through underlying strata and have a steep gradient, and if the base level is relatively high, then the stream will form a flood plain and meander.

Profile

Typically, streams are said to have a particular elevation profile, beginning with steep gradients, no flood plain, and little shifting of channels, eventually evolving into streams with low gradients, wide flood plains, and extensive meanders. The initial stage is sometimes termed a "young" or "immature" stream, and the later state a "mature" or "old" stream.

Meander

Meanders are looping changes of direction of a stream caused by the erosion and deposition of bank materials. These are typically serpentine in form. Typically, over time the meanders gradually migrate downstream. If some resistant material slows or stops the downstream movement of a meander, a stream may erode through the neck between two legs of a meander to become temporarily straighter, leaving behind an arc-shaped body of water termed an oxbow lake or bayou. A flood may also cause a meander to be cut through in this way.

Stream load

The stream load is defined as the solid matter carried by a stream. Streams can carry sediment, or alluvium. The amount of load it can carry (capacity) as well as the largest object it can carry (competence) are both dependent on the velocity of the stream.

Classification

Perennial or not

A perennial stream is one which flows continuously all year.BOOK, Outline of ground-water hydrology, with definitions, Meinzer, Oscar E., 1923, USGS, Washington, DC, 10.3133/wsp494,weblink live,weblink 2017-07-09, Water Supply Paper 494.{{rp|57}} Some perennial streams may only have continuous flow in segments of its stream bed year round during years of normal rainfall.BOOK, Outline of ground-water hydrology, with definitions, Meinzer, Oscar E., 1923, US Geological Survey (USGS), Washington, DC, 57, 10.3133/wsp494,weblink live,weblink 2017-07-09, Water Supply Paper 494.WEB, OSM – COALEX State Inquiry Report 97,weblink 2011-12-11, live,weblink" title="web.archive.org/web/20120415074327weblink">weblink 2012-04-15, Blue-line streams are perennial streams and are marked on topographic maps with a solid blue line.

Ephemeral stream

Generally, streams that flow only during and immediately after precipitation are termed ephemeral. There is no clear demarcation between surface runoff and an ephemeral stream,{{rp|58}} and some ephemeral streams can be classed as intermittent—flow all but disappearing in the normal course of seasons but ample flow (backups) restoring stream presence {{mdash}} such circumstances are documented when stream beds have opened up a path into mines or other underground chambers.Black Creek (Susquehanna River)#Hydrology and climate, 'Black Creek is an ephemeral stream. It used to drain an area between Turtle Creek and the Susquehanna River, but now loses its flow to underground mines via broken bedrock. Its channel is also disrupted by strip mines and rock piles.', 14 Nov 2016.According to official U.S. definitions, the channels of intermittent streams are well-defined,WEB, 2. EVALUATING THE BIOLOGICAL SIGNIFICANCE OF INTERMITTENT STREAMS,weblink www.fs.fed.us, 2020-05-18, as opposed to ephemeral streams, which may or may not have a defined channel, and rely mainly on storm runoff, as their aquatic bed is above the water table.BOOK, Identification Methods for the Origins of Intermittent and Perennial streams, Version 3.1., Stream Identification Method and Rating Form: Definitions, 2, North Carolina Department of Environment and Natural Resources, Division of Water Quality, 28 February 2005,weblink 28 February 2021, An ephemeral stream does not have the biological, hydrological, and physical characteristics of a continuous or intermittent stream. The same non-perennial channel might change characteristics from intermittent to ephemeral over its course.

{{Anchor|torrent}}Intermittent or seasonal stream

{{See also|Intermittent river}}(File:Low creek.jpg|thumb|Australian creek, low in the dry season, carrying little water. The energetic flow of the stream had, in flood, moved finer sediment further downstream. There is a pool to lower right and a riffle to upper left of the photograph.)(File:Small stream in a dell.jpg|thumb|A small, narrow stream flowing down a tiny dell in Pennsylvania.)Washes can fill up quickly during rains, and there may be a sudden torrent of water after a thunderstorm begins upstream, such as during monsoonal conditions. In the United States, an intermittent or seasonal stream is one that only flows for part of the year and is marked on topographic maps with a line of blue dashes and dots.{{rp|57–58}} A wash, desert wash, or arroyo is normally a dry streambed in the deserts of the American Southwest, which flows after sufficient rainfall.In Italy, an intermittent stream is termed a torrent (). In full flood the stream may or may not be "torrential" in the dramatic sense of the word, but there will be one or more seasons in which the flow is reduced to a trickle or less. Typically torrents have Apennine rather than Alpine sources, and in the summer they are fed by little precipitation and no melting snow. In this case the maximum discharge will be during the spring and autumn. An intermittent stream can also be called a winterbourne in Britain, a wadi in the Arabic-speaking world or torrente or rambla (this last one from arabic origin) in Spain and Latin America. In Australia, an intermittent stream is usually called a creek and marked on topographic maps with a solid blue line.{{cn|date=February 2021}}

Consequential or not

There are five generic classifications:{{anchor|consequent stream}}

• Consequent streams are streams whose course is a direct consequence of the original slope of the surfaceWEB,weblink consequent stream, Dictionary.com, 2008-04-24, upon which it developed, i.e., streams that follow slope of the land over which they originally formed.

{{anchor|subsequent stream}}

• Subsequent streams are streams whose course has been determined by selective headward erosion along weak strata. These streams have generally developed after the original stream. Subsequent streams developed independently of the original relief of the land and generally follow paths determined by the weak rock belts.
• Resequent streams are streams whose course follows the original relief, but at a lower level than the original slope (e.g., flows down a course determined by the underlying strata in the same direction). These streams develop later and are generally a tributary to a subsequent stream.WEB, Definition of RESEQUENT,weblink 2022-12-14, www.merriam-webster.com, en,
• Obsequent streams are streams flowing in the opposite direction of the consequent drainage.
• Insequent streams have an almost random drainage often forming dendritic patterns. These are typically tributaries and have developed by a headward erosion on a horizontally stratified belt or on homogeneous rocks. These streams follow courses that apparently were not controlled by the original slope of the surface, its structure or the type of rock.

Drainage basins

The extent of land basin drained by a stream is termed its drainage basin (also known in North America as the watershed and, in British English, as a catchment).BOOK, Hydrologic Definitions: Watershed, Manual of Hydrology: Part 1. General Surface-Water Techniques, Water Supply Paper 1541-A, Langbein, W.B., Iseri, Kathleen T., 1995, USGS, Reston, VA,weblink live,weblink" title="web.archive.org/web/20120509220533weblink">weblink 2012-05-09, A basin may also be composed of smaller basins. For instance, the Continental Divide in North America divides the mainly easterly-draining Atlantic Ocean and Arctic Ocean basins from the largely westerly-flowing Pacific Ocean basin. The Atlantic Ocean basin, however, may be further subdivided into the Atlantic Ocean and Gulf of Mexico drainages. (This delineation is termed the Eastern Continental Divide.) Similarly, the Gulf of Mexico basin may be divided into the Mississippi River basin and several smaller basins, such as the Tombigbee River basin. Continuing in this vein, a component of the Mississippi River basin is the Ohio River basin, which in turn includes the Kentucky River basin, and so forth.

Crossings

Stream crossings are where streams are crossed by roads, pipelines, railways, or any other thing which might restrict the flow of the stream in ordinary or flood conditions. Any structure over or in a stream which results in limitations on the movement of fish or other ecological elements may be an issue.

See also

• Aqueduct (water supply)
• Environmental flow
• Fluvial sediment processes
• Head cut
• Playfair's Law
• River ecosystem
• Rock-cut basin
• Tidal stream generator

References

{{Reflist|2}}

External links

{{Wiktionary|stream}}{{Commons category|Streams}}

• Glossary of stream-related terms, StreamNet

{{rivers, streams and springs}}{{Authority control}}