A stream is a continuous body of surface water 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 .
54-717: Boorowa River , a perennial stream that is part of the Lachlan catchment within the Murray–Darling basin , is located in the central–western region of New South Wales , Australia . The river rises about 16 kilometres (9.9 mi) north of Yass and flows generally north, joined by two minor tributaries , before reaching its confluence with the Lachlan River about 18 kilometres (11 mi) south–east of Cowra ; dropping 318 metres (1,043 ft) over its course of 134 kilometres (83 mi). The river flows through
108-403: A bed armor layer, and other depositional features, plus well defined banks due to bank erosion, are good identifiers when assessing for perennial streams. Particle size will help identify a perennial stream. Perennial streams cut through the soil profile, which removes fine and small particles. By assessing areas for relatively coarse material left behind in the stream bed and finer sediments along
162-658: A continuous aquatic habitat until they reach maturity. Crayfish and other crustaceans , snails , bivalves (clams), and aquatic worms also indicate the stream is perennial. These require a persistent aquatic environment for survival. Fish and amphibians are secondary indicators in assessment of a perennial stream because some fish and amphibians can inhabit areas without persistent water regime. When assessing for fish, all available habitat should be assessed: pools, riffles, root clumps and other obstructions. Fish will seek cover if alerted to human presence, but should be easily observed in perennial streams. Amphibians also indicate
216-470: A continuous or intermittent stream. The same non-perennial channel might change characteristics from intermittent to ephemeral over its course. 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
270-615: 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. A creek ( / k r iː k / ) or crick ( / k r ɪ k / ): In hydrography, gut is a small creek; this is seen in proper names in eastern North America from the Mid-Atlantic states (for instance, The Gut in Pennsylvania, Ash Gut in Delaware, and other streams) down into
324-422: A drainage network. Although each tributary has its own source, international practice is to take the source farthest from the river mouth as the source of the entire river system, from which the most extended length of the river measured as the starting point is taken as the length of the whole river system, and that furthest starting point is conventionally taken as the source of the whole river system. For example,
378-540: A larger stream. Common terms for individual river distributaries in English-speaking countries are arm and channel . There are a number of regional names for a stream. A 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
432-404: A path into mines or other underground chambers. According to official U.S. definitions, the channels of intermittent streams are well-defined, 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 . An ephemeral stream does not have the biological, hydrological, and physical characteristics of
486-412: A perennial stream and include tadpoles , frogs , salamanders , and newts . These amphibians can be found in stream channels, along stream banks, and even under rocks. Frogs and tadpoles usually inhabit shallow and slow moving waters near the sides of stream banks. Frogs will typically jump into water when alerted to human presence. Well defined river beds composed of riffles, pools, runs, gravel bars,
540-483: A perennial stream, fine sediment may cling to riparian plant stems and tree trunks. Organic debris drift lines or piles may be found within the active overbank area after recent high flow. Streams, headwaters, and streams flowing only part of the year provide many benefits upstream and downstream. They defend against floods, remove contaminants, recycle nutrients that are potentially dangerous as well as provide food and habitat for many forms of fish. Such streams also play
594-580: A population of 337,617 as of January 2019. The islands of the Dutch Caribbean were, formerly, part of Curaçao and Dependencies (1815–1828), or Sint Eustatius and Dependencies (1815–1828), which were merged with the colony of Suriname (not actually considered part of the "Dutch Caribbean", although it is located on the Caribbean coast of northeastern South America ). Until 1845, they were governed from Paramaribo , Suriname, at which point all
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#1732798286335648-406: A slow-moving wetted channel or stagnant area. This is evidence that iron-oxidizing bacteria are present, indicating persistent expression of oxygen-depleted ground water. In a forested area, leaf and needle litter in the stream channel is an additional indicator. Accumulation of leaf litter does not occur in perennial streams since such material is continuously flushed. In the adjacent overbank of
702-486: A stream as intermittent, "showing interruptions in time or space". 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, 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 — such circumstances are documented when stream beds have opened up
756-424: 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
810-524: A thin layer called sheet wash, combined with a network of tiny rills, which together form the sheet runoff; when this water is focused in a channel, a stream is born. Some rivers and streams may begin from lakes or ponds. Freshwater's primary sources are precipitation and mountain snowmelt. However, rivers typically originate in the highlands, and are slowly created by the erosion of mountain snowmelt into lakes or rivers. Rivers usually flow from their source topographically, and erode as they pass until they reach
864-657: A unified political entity, in 2010; that year, Curaçao and Sint Maarten became autonomous constituent countries within the Kingdom (like Aruba). Bonaire, Sint Eustatius and Saba became special municipalities of the Netherlands proper (located on the European mainland ), a member state of the European Union . Geographically, the six entities of the Dutch Caribbean are clustered into two vastly separated areas of
918-627: A vital role in preserving our drinking water quality and supply, ensuring a steady flow of water to surface waters and helping to restore deep aquifers. 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). A basin may also be composed of smaller basins. For instance, the Continental Divide in North America divides
972-435: 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
1026-425: Is sometimes termed a "young" or "immature" stream, and the later state a "mature" or "old" stream. 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
1080-456: Is usually called a creek and marked on topographic maps with a solid blue line. There are five generic classifications: "Macroinvertebrate" refers to easily seen invertebrates , larger than 0.5 mm, found in stream and river bottoms. Macroinvertebrates are larval stages of most aquatic insects and their presence is a good indicator that the stream is perennial. Larvae of caddisflies , mayflies , stoneflies , and damselflies require
1134-604: The SSS islands . The latter split into the Island Territories of Saba, Sint Eustatius and Sint Maarten, in 1983. The island of Aruba seceded from the Netherlands Antilles in 1986 to become a separate constituent country of the Kingdom of the Netherlands, leaving five island territories within the Netherlands Antilles. This arrangement lasted until the complete dissolution of the Netherlands Antilles , as
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#17327982863351188-691: 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. 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
1242-549: The constituent countries of Curaçao , Aruba and Sint Maarten (the 'CAS' islands) and the special municipalities of Bonaire , Sint Eustatius and Saba (BES islands). The term "Dutch Caribbean" is sometimes also used for the Caribbean Netherlands , an entity consisting of the three special municipalities forming part of the constituent country of the Netherlands since 2010. The Dutch Caribbean had
1296-480: The velocity of the stream. A perennial stream is one which flows continuously all year. Some perennial streams may only have continuous flow in segments of its stream bed year round during years of normal rainfall. Blue-line streams are perennial streams and are marked on topographic maps with a solid blue line. The word "perennial" from the 1640s, meaning "evergreen," is established in Latin perennis, keeping
1350-440: The " BES islands ", or the Caribbean Netherlands . Bonaire is located in the far south of the Caribbean, being about 80 kilometres north of the coast of Venezuela; Saba is located about 50 kilometres south of Sint Maarten, and boasts the highest mountain in the Netherlands, Mount Scenery , at 880 m (2,887') above sea level). Sint Eustatius is located directly north of Saint Kitts . The islands have also been informally grouped in
1404-647: The Caribbean (for instance, Guinea Gut , Fish Bay Gut , Cob Gut , Battery Gut and other rivers and streams in the United States Virgin Islands , in Jamaica (Sandy Gut, Bens Gut River, White Gut River), and in many streams and creeks of the Dutch Caribbean ). 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 . The linear channel between
1458-672: The Caribbean: Politically, each (six) entity of the Dutch Caribbean currently has one of two relationships with the Netherlands: Three Caribbean polities are landen (Dutch for "countries") within the Kingdom of the Netherlands: Aruba, Curaçao, and Sint Maarten. The Netherlands is the fourth and largest constituent country in the Kingdom. Sint Maarten comprises the southern half of the island of Saint Martin . The northern half of
1512-533: The atmosphere either by evaporation from soil and water bodies, or by plant evapotranspiration. By infiltration some of the water sinks into the earth and becomes groundwater, much of which eventually enters streams. Most precipitated water is partially bottled up by evaporation or freezing in snow fields and glaciers. The majority of the water flows as a runoff from the ground; the proportion of this varies depending on several factors, such as climate, temperature, vegetation, types of rock, and relief. This runoff begins as
1566-525: 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. 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
1620-597: The base stage of erosion. The scientists have offered a way based on data to define the origin of the lake. A classified sample was the one measured by the Chinese researchers from the University of Chinese Academy of Sciences. As an essential symbol of the river formation environment, the river source needs an objective and straightforward and effective method of judging . A calculation model of river source catchment area based on critical support flow (CSD) proposed, and
1674-707: 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
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1728-500: The following ways. The populations of the Dutch Caribbean descend from a diverse array of ethnic groups ( Europeans , Africans , Natives , Latin-Americans , Jews , Levantine Arabs , Asians etc.), having been home to numerous people groups, languages and cultures over time. The Dutch Caribbean is generally ethnically mixed, but the ethnic makeup of each island varies. People from Aruba have higher degrees of European and Indigenous ancestry ( mestizos ) on average, while people from
1782-447: The form of rain and snow. 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
1836-407: 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 . A brook is a stream smaller than
1890-469: The island (the Collectivity of Saint Martin ) is an overseas territory of France . Aruba and Curaçao are located in the far south of the Caribbean, roughly 30 kilometres and 65 kilometres from the coast of Venezuela, respectively. The three Caribbean islands that are special municipalities of the Netherlands alone are Bonaire, Sint Eustatius, and Saba. Abbreviated collectively, these are also known as
1944-472: The islands, again, became part of Curaçao and Dependencies. In 1954, the islands became the land (Dutch for "country") of Netherlands Antilles , lasting until 2010. The autonomy of the Netherlands Antilles' island territories was stipulated in the Islands Regulation of the Netherlands Antilles . Initially, the Netherlands Antilles consisted of four island territories—Aruba, Bonaire, Curaçao and
1998-513: The islands. Dutch is not the common or native language on any of the Dutch Caribbean islands, although most inhabitants do know and can speak Dutch quite well. Dutch is used in government documents, jobs and education. Dutch usage on the islands also varies, with Dutch generally having a larger and more significant presence on Curaçao and Bonaire. Other languages such as Portuguese , Haitian Creole , French , Sranan Tongo , German , Chinese , Tagalog are also spoken by smaller communities on
2052-532: The lake has significant feeder rivers. The Kagera River, which flows into Lake Victoria near Bukoba's Tanzanian town , is the longest feeder, though sources do not agree on which is the Kagera's longest tributary and therefore the Nile's most remote source itself. 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
2106-621: The language, Papiamento (Aruba) and Papiamentu (Curaçao and Bonaire). It is an official language on Aruba and Curaçao and is used in almost all aspects of life on the ABC Islands. English pre-dominates on Sint Maarten, Saba and Sint Eustatius. English is also widely known and spoken on Aruba, Bonaire and Curaçao (especially on Aruba). Spanish is widely known and spoken on Aruba, Bonaire and Curaçao due to proximity, historical and cultural connections to Venezuela and Colombia . Many Spanish-speaking immigrants from Latin-America also reside on
2160-683: 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
2214-412: The meaning as "everlasting all year round," per "over" plus annus "year." This has been proved since the 1670s by the "living years" in the sense of botany. The metaphorical sense of "enduring, eternal" originates from 1750. They are related to "perennial." See biennial for shifts in vowels. Perennial streams have one or more of these characteristics: Absence of such characteristics supports classifying
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2268-805: The movement of fish or other ecological elements may be an issue. Dutch Caribbean The Dutch Caribbean (historically known as the Dutch West Indies ) are the New World territories, colonies, and countries (former and current) of the Dutch Empire and the Kingdom of the Netherlands located in the Caribbean Sea , mainly the northern and southwestern regions of the Lesser Antilles archipelago. Currently, it comprises
2322-453: 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. 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
2376-596: The origin of the Nile River is the confluence of the White Nile and the Blue Nile, but the source of the whole river system is in its upper reaches. If there is no specific designation, "length of the Nile" refers to the "river length of the Nile system", rather than to the length of the Nile river from the point where it is formed by a confluence of tributaries. The Nile's source is often cited as Lake Victoria, but
2430-430: The other hand, has a relatively constant input and is controlled more by long-term patterns of precipitation. The stream encompasses surface, subsurface and groundwater fluxes that respond to geological, geomorphological, hydrological and biotic controls. Streams are important as conduits in the water cycle , instruments in groundwater recharge , and corridors for fish and wildlife migration. The biological habitat in
2484-499: The other islands (Curaçao, Bonaire, Sint Maarten, Saba and St. Eustatius) tend to have higher degrees of African ancestry on average. Inhabitants of the Dutch Caribbean are multi-lingual, often speaking 3 to 4 languages at high degrees of fluency. Papiamento , a Portuguese-based creole, is the pre-dominant language on Aruba, Bonaire and Curaçao. It is a Portuguese-based creole with heavy influence from Spanish, Dutch, West-African languages and Native languages. There are 2 dialects of
2538-415: The parallel ridges or bars on a shoreline beach or river floodplain, or between a bar and the shore. Also called a swale . 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 ocean but joins another river (a parent river). Sometimes also called a branch or fork. A distributary , or a distributary channel ,
2592-469: The relationship between CSA and CSD with a minimum catchment area established. Using the model for comparison in two basins in Tibet (Helongqu and Niyang River White Water), the results show that the critical support flow (Qc) of the housing dragon song is 0.0028 m /s. At the same time, the white water curvature is 0.0085 m /s. Besides, the critical support flow can vary with hydrologic climate conditions, and
2646-425: The side of the stream or within the floodplain will be a good indicator of persistent water regime. A perennial stream can be identified 48 hours after a storm. Direct storm runoff usually has ceased at this point. If a stream is still flowing and contributing inflow is not observed above the channel, the observed water is likely baseflow. Another perennial stream indication is an abundance of red rust material in
2700-637: The town of Boorowa , from where it draws its name, an Aboriginal Wiradjuri word for kangaroo. 33°57′S 148°50′E / 33.950°S 148.833°E / -33.950; 148.833 This New South Wales river or creek related article is a stub . You can help Misplaced Pages by expanding it . Perennial stream 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
2754-655: The vital support flow Qc in wet areas (white water) is larger than in semi-arid regions (heap slot). The proposed critical support flow (CSD) concept and model method can be used to determine the hydrographic indicators of river sources in complex geographical areas, and it can also reflect the impact of hydrologic climate change on river recharge in different regions. The source of a river or stream (its point of origin) can consist of lakes, swamps, springs, or glaciers. A typical river has several tributaries; each of these may be made up of several other smaller tributaries, so that together this stream and all its tributaries are called
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#17327982863352808-512: 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. The streams typically derive most of their water from rain and snow precipitation. Most of this water re-enters
2862-521: The year and is marked on topographic maps with a line of blue dashes and dots. 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 ( Italian : torrente ). 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
2916-402: 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. The gradient of
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