A report on Stream

Aubach (Wiehl) in North Rhine-Westphalia, Germany
Rocky stream in Italy
Frozen stream in Enäjärvi, Pori, Finland
Stream near Montriond in southeastern France
Wyming Brook in Sheffield, UK
A small stream in Lake Parramatta, Sydney
Stream with low gradient surrounded by natural riparian vegetation (Rhineland-Palatinate)
A low level stream in Macon County, Illinois, US
Small tributary stream, Diamond Ridge, Alaska, US
Creek in Perisher Ski Resort, Australia
Stream in Southbury, US
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.
Stream in Alberta
A small, narrow stream flowing down a tiny dell in Pennsylvania.

Continuous body of surface water flowing within the bed and banks of a channel.

- Stream
Aubach (Wiehl) in North Rhine-Westphalia, Germany

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Overall
An illustration showing groundwater in aquifers (in blue) (1, 5 and 6) below the water table (4), and three different wells (7, 8 and 9) dug to reach it.

Groundwater

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Water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations.

Water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations.

An illustration showing groundwater in aquifers (in blue) (1, 5 and 6) below the water table (4), and three different wells (7, 8 and 9) dug to reach it.
Dzherelo, a common source of drinking water in a Ukrainian village
The entire surface water flow of the Alapaha River near Jennings, Florida, going into a sinkhole leading to the Floridan Aquifer groundwater
Groundwater may be extracted through a water well
Diagram of a water balance of the aquifer
Iron (III) oxide staining (after water capillary rise in a wall) caused by oxidation of dissolved iron (II) and its subsequent precipitation, from an unconfined aquifer in karst topography. Perth, Western Australia.
Groundwater withdrawal rates from the Ogallala Aquifer in the Central United States
Center-pivot irrigated fields in Kansas covering hundreds of square miles watered by the Ogallala Aquifer

Groundwater is naturally replenished by surface water from precipitation, streams, and rivers when this recharge reaches the water table.

This coral reef in the Phoenix Islands Protected Area provides habitat for numerous marine species.

Habitat

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Area, such as to support the survival and reproduction of a particular species.

Area, such as to support the survival and reproduction of a particular species.

This coral reef in the Phoenix Islands Protected Area provides habitat for numerous marine species.
Few creatures make the ice shelves of Antarctica their habitat, but water beneath the ice can provide habitat for multiple species.
Ibex in an alpine habitat
Rich rainforest habitat in Dominica
Wetland habitat types in Borneo
Desert scene in Egypt
An Antarctic rock split apart to show endolithic lifeforms showing as a green layer a few millimeters thick
Dense mass of white crabs at a hydrothermal vent, with stalked barnacles on right
Twenty five years after the devastating eruption at Mount St. Helens, United States, pioneer species have moved in.

Fresh-water habitat types include marshes, streams, rivers, lakes, and ponds; marine habitat types include salt marshes, the coast, the intertidal zone, estuaries, reefs, bays, the open sea, the sea bed, deep water and submarine vents.

The water in this stream forms varying currents as it makes its way downhill

Current (stream)

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The water in this stream forms varying currents as it makes its way downhill

A current in a stream is the flow of water influenced by gravity as the water moves downhill to reduce its potential energy.

Ford (crossing)

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Crossing the Red River near Granite, Oklahoma in 1921
Crossing the Milkhouse ford through Rock Creek in 1960
A ford next to a bridge that can only support 1.5 tonnes in Aufseß, Germany
Dean Ford
The Battle of Rorke's Drift in the Anglo-Zulu war
The Rye Water Ford in North Ayrshire, an unmodernised crossing of a minor river<ref>{{cite web |title=Coming Through The Rye, Scottish Country Dance Instructions |url=https://www.scottish-country-dancing-dictionary.com/dance-crib/coming-through-the-rye.html |publisher=.Scottish Country Dancing Dictionary |access-date=19 March 2021}}</ref>
A ford in Stanhope, England, that has been closed<ref>{{cite news |title=Stanhope Ford's permanent closure approved |url=https://www.bbc.com/news/uk-england-tyne-17115018 |access-date=19 March 2021 |work=BBC News |date=21 February 2012}}</ref>
A ford in a 19th-century oil painting. In this instance, the ford may have artistic or symbolic significance
A Berber family crossing a ford in Algeria
The ford at Brockenhurst following heavy rain<ref>{{cite web |last1=Tehrani |first1=Zoe |title=A guide to the circular Brockenhurst village walk |url= https://shewalksinengland.com/guide-circular-brockenhurst-village-walk/ |publisher=She walks in England |access-date=19 March 2021 |date=19 January 2020}}</ref>
A ford, with pedestrian footbridge, on a minor road near Weimar bei Kassel in Germany
Fording an Indian River, c. 1905

A ford is a shallow place with good footing where a river or stream may be crossed by wading, or inside a vehicle getting its wheels wet.

Flooding in a street in Morpeth, England. Flooding is increasing with extreme weather events caused by climate change are creating rainfall events with much more rain than in the past. Cities and towns built on waterbodies or with infrastructure designed around historical rainfall patterns are increasingly susceptible to urban flooding.

Flood

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Overflow of water that submerges land that is usually dry.

Overflow of water that submerges land that is usually dry.

Flooding in a street in Morpeth, England. Flooding is increasing with extreme weather events caused by climate change are creating rainfall events with much more rain than in the past. Cities and towns built on waterbodies or with infrastructure designed around historical rainfall patterns are increasingly susceptible to urban flooding.
Contemporary picture of the flood that struck the North Sea coast of Germany and Denmark in October 1634.
People seeking refuge from flood in Jawa Tengah, Java. ca. 1865–1876.
View of flooded New Orleans in the aftermath of Hurricane Katrina. New Orleans, because it is on a River Delta and experiences Hurricanes, has historically been very vulnerable to flooding. Katrina's extreme rainfall and poor infrastructure maintenance led to a levee breach which flooded large portions of the city.
"Regular" flooding in Venice, Italy.
Flooding of a creek due to heavy monsoonal rain and high tide in Darwin, Northern Territory, Australia.
Flood in Jeddah, covering the King Abdullah Street in Saudi Arabia.
In spring time, the floods are quite typical in Ostrobothnia, a flat-lying area in Finland. A flood-surrounded house in Ilmajoki, South Ostrobothnia.
Flooding on Water Street in Toledo, Ohio, 1881
Flood due to Cyclone Hudhud in Visakhapatnam
A dog sitting on top of 2 feet of mud deposited by flooding in the 2018 Kerala floods in India. Flooding not only creates water damage, but can also deposit large amounts of sediment.
Coastal flooding in a Florida community.
Flooding after 1991 Bangladesh cyclone, which killed around 140,000 people.
Flooding near Key West, Florida, United States from Hurricane Wilma's storm surge in October 2005.
Flooding in a street of Natal, Rio Grande do Norte, Brazil in April 2013.
Minor flooding in a parking lot off Juniper street Atlanta on Christmas Eve from thunderstorms caused by an El Nino event. The same El Nino caused recorded highs for January in Atlanta
Flash flooding caused by heavy rain falling in a short amount of time.
Dozens of villages were inundated when rain pushed the rivers of northwestern Bangladesh over their banks in early October 2005. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite captured the top image of the flooded Ghaghat and Atrai Rivers on October 12, 2005. The deep blue of the rivers is spread across the countryside in the flood image.
Aftermath of flooding in Colorado, 2013
Flood rescue in Nangarhar, Afghanistan in 2010, accompanied by the Afghan Air Force and USAF air advisors

Floods occur in all types of river and stream channels, from the smallest ephemeral streams in humid zones to normally-dry channels in arid climates to the world's largest rivers.

Angel Falls in Venezuela is the world's tallest waterfall at 979 m (3,212 ft).

Waterfall

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Angel Falls in Venezuela is the world's tallest waterfall at 979 m (3,212 ft).
Formation of a waterfall
The Dettifoss in Iceland on 31 July 1972
An example of an ephemeral waterfall. This one, when flowing, feeds into the Chagrin River.
Niagara Falls, from the American Side (Frederic Edwin Church, 1867)
A man practicing sādhanā in Japan

A waterfall is a point in a river or stream where water flows over a vertical drop or a series of steep drops.

On an average day nearly 303 e6USgal of water flow from Big Spring in Missouri at a rate of 469 cuft/s.

Spring (hydrology)

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Point of exit at which groundwater from an aquifer flows out on top of Earth's crust and becomes surface water.

Point of exit at which groundwater from an aquifer flows out on top of Earth's crust and becomes surface water.

On an average day nearly 303 e6USgal of water flow from Big Spring in Missouri at a rate of 469 cuft/s.
Grand Prismatic Spring, Yellowstone National Park, Wyoming
A natural spring on Mackinac Island in Michigan
Sunrise at Middle Spring, Fish Springs National Wildlife Refuge, Utah
Fontaine de Vaucluse or Spring of Vaucluse in France discharges about 470 e6USgal of water per day at a rate of 727 cubic feet (21 m3) per second.
Pruess Lake is spring-fed in the arid Snake Valley of Utah.
Natural iron hot spring in Beppu, Japan
Trout fishing on Maramec Spring in Missouri
Fontes Tamarici, in Spain
The Mother Spring, Pagosa Hot Springs, Colorado
thumb|John William Waterhouse Echo And Narcissus, 1903
thumb|Lucas Cranach, Der Jungbrunnen (Fountain of Youth), 1546
thumb|Sokokura, from the series Two Artists Tour the Seven Hot Springs (Sōhitsu shichitō meguri) by Utagawa Toyokuni III and Utagawa Hiroshige, 1854
thumb|Oracle of Delphi, red-figure kylix, Kodros Painter, depicting Pythia with a cup presumably holding water from a spring, 440-430 BC
thumb|A Woman Drinks at the Carmen Spring, on West 175th Street and Amsterdam Avenue, New York City, by James Reuel Smith, C. 1897-1902
Que Hua Qiu Se Tu, depicting the view of spings and mountains in Jinan, by Zhao Mengfu, Song Dynasty (Chinese:鹊华秋色图)
Natural spring in Pennsylvania where runoff flows from above down through grass and rocks.

In some cases entire creeks seemingly disappear as the water sinks into the ground via the stream bed.

An inland lake, an example of surface water

Surface water

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Water located on top of the Earth's surface, and may also be referred to as blue water.

Water located on top of the Earth's surface, and may also be referred to as blue water.

An inland lake, an example of surface water
The entire surface water flow of the Alapaha River near Jennings, Florida going into a sinkhole leading to the Floridan Aquifer groundwater.
A stream gauge used to measure surface water.

Semi-permanent (ephemeral) surface water refers to bodies of water that are only present at certain times of the year including seasonally dry channels such as creeks, lagoons and waterholes.

Bifurcation in Hövelhof, Germany

River bifurcation

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Bifurcation in Hövelhof, Germany
River deltas such as the pictured delta of the Salween River in Myanmar often show bifurcations. The water flows in from the lower section of the image and passes on both sides of the large island in the center.
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River bifurcation (from furca, fork) occurs when a river flowing in a single stream separates into two or more separate streams (called distributaries) which then continue downstream.

Winterbourne (stream)

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A winterbourne is a stream or river that is dry through the summer months, a special case of an intermittent stream.