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In this stage, a stream has little, if any, floodplain. Rapids and waterfalls may mark its course. A stream in its mature stage has a moderate gradient and velocity because it has eroded its bed downward and is closer to base level.

Since it has slowed down, the stream begins to meander. While it is still eroding downward, the stream's main force of erosion is lateral horizontal as it begins winding back and forth, carving out a valley floor between valley walls or bluffs.

Periodically, the stream will flood all or a part of its valley, depositing alluvium on its developing floodplain. An old age stream has nearly reached its base level, and its gradient and velocity are very low.

Because its velocity is low, it has lost its ability to erode downward. In fact, it deposits as much material as it erodes. The stream meanders greatly in its nearly flat valley.

It has a wide, well-developed floodplain marked with oxbow lakes. A stream with the correct gradient and channel characteristics to maintain the velocity required to transport its sediment load is known as a graded stream.

It is a stream that is in equilibrium or balance. On average, it is neither eroding nor depositing sediment but simply transporting it.

This involves a balance among base level, discharge, channel shape or size, and sediment load. Any changes to one or more of these by some event—lowering of sea level, the uplift of a land area containing a stream, the blocking of a stream channel by natural or artificial means—will result in erosion or deposition until a new balanced state is reached.

The world's second longest river, the Amazon, runs for about 3, miles through Peru and Brazil. When it enters the ocean, the Amazon discharges about 7,, cubic feet , cubic meters of water per second.

The width of the Amazon ranges from about 1 to 8 miles 1. Although the Amazon is usually only about 20 to 40 feet 6 to 12 meters deep, there are narrow channels where it can reach a depth of feet 91 meters.

Almost every year, the Amazon floods, filling a flood-plain up to 30 miles 48 kilometers wide. The fresh layer of sediment deposited by the flood makes the surrounding region extremely fertile.

The Amazon basin the area drained by the Amazon River is the largest river basin in the world. It covers an area of about 2,, square miles 6,, square kilometers , or almost 35 percent of the land area of South America.

The volume of water that flows from the basin into the Atlantic is about 11 percent of all the water drained from all the continents of Earth. The most famous of these waterfalls is located on the border between Argentina and Brazil.

The river drops feet 82 meters at the falls. The water in the river flows over the edge of the falls at an average rate of cubic feet 17 cubic meters per second.

The falls were created nearly , years ago when a volcanic eruption produced a lava flow that stopped abruptly, forming a huge, natural cliff.

The Volga River in western Russia is the longest river in Europe. It begins in the Valdai Hills northwest of Moscow and flows for about 2, miles 3, kilometers before forming a great delta where it enters the.

The Volga River, in Russia, is the longest river in Europe, running for some 2, miles. Caspian Sea. Its source is only feet meters above sea level.

Combined with its many tributaries, the Volga River drains an area of over , square miles 1,, square kilometers. Much of the water that flows in the Volga River comes from snowmelt.

Many large dams have been built on the river to provide hydroelectricity and water for irrigation. Prior to the dams being built, the river carried an estimated The dams have also reduced the amount of natural floods along the river and the velocity of the river's flow.

Leopold, Luna B. A View of the River. Water, Rivers and Creeks. Martin, Patricia A. Rivers and Streams. New York: Franklin Watts, Schuh, Mari C.

What Are Rivers? Mankato, MN: Pebble Books, Geological Survey. Toggle navigation. Photo by: psnoonan. Stream and river: Words to Know Alluvial fan: A fanlike deposit of sediment that forms where an intermittent, yet rapidly flowing, canyon or mountain stream spills out onto a plain or relatively flat valley.

Alluvium: The general term for sediment rock debris such as gravel, sand, silt, and clay deposited by running water.

Base level: The level below which a stream cannot erode. Bed load: The coarse sediment rolled along the bottom of a stream. Channel: The depression where a stream flows or may flow.

Cut bank: A steep, bare slope formed on the outside of a meander. Delta: A body of sediment deposited at the mouth of a stream where it enters an ocean or a lake.

Dissolved load: Dissolved substances, the result of the chemical weathering of rock, that are carried along in a stream. Distributaries: The channels that branch off of the main stream in a delta, carrying water and sediment to the delta's edges.

Erosion: The gradual wearing away of Earth surfaces through the action of wind and water. Floodplain: An area of nearly flat land bordering a stream that is naturally subject to periodic flooding.

Graded stream: A stream that is maintaining a balance between the processes of erosion and deposition. Groundwater: Freshwater lying within the uppermost parts of Earth's crust, filling the pore spaces in soil and fractured rock.

Levee natural : A low ridge or mound along a stream bank, formed by deposits left when floodwater slows down on leaving the channel.

Meander: A bend or loop in a stream's course. Oxbow lake: A crescent-shaped body of water formed from a single loop that was cut off from a meandering stream.

Point bar: The low, crescent-shaped deposit of sediment on the inside of a meander. Rapids: The section of a stream where water flows fast over hard rocks.

River: A large stream. Stream: Any body of running water that moves downslope under the influence of gravity in a defined channel on Earth's surface.

Suspended load: The fine-grained sediment that is suspended in the flow of water in a stream. Waterfall: A steep drop in a stream bed causing the water in a stream channel to fall vertically or nearly vertically.

The Literary Landscape "The overall impression here, as one surveys the river spread out over the gravel bars, is of a suspension of light, as though light were reverberating on a membrane.

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This geology article is a stub. This type of channel is called a braided stream channel because the many crisscrossing smaller channels resemble hair braids.

When discharge increases in the channel, the bars and islands may be covered or eroded and redeposited once the discharge decreases again.

If vegetation takes hold on the bars or islands, these features may not be easily eroded. The course of a stream's channel can be affected if the rock layer over which it passes changes from a hard, resistant layer to one that is weaker and more easily eroded.

As the softer material is worn away, the resistant rock remains as a step or ledge over which the water in the channel flows.

This drop in the stream bed that causes the water to fall vertically or nearly vertically is called a waterfall. Often the drop is steep. A waterfall may also develop where a stream flows over the edge of a plateau or in.

In a waterfall, as water continues to fall over the edge, it erodes the bed of the channel at the base of the waterfall.

A basin or depression is created, and sediment carried by the stream is deposited here. Depending on their hardness, the rock layers behind the falling water may also be eroded over time by the action of the water.

As these softer layers are cut into, the resistant layer under the bed of the stream ultimately loses support and falls into the water at the base of the waterfall.

When this occurs, the waterfall retreats farther upstream. Normally, over time, the stream will erode the resistant rock so the gradient of the channel is not as steep.

The waterfall will be reduced to rapids, an area where water in the stream channel rushes downward over hard rocks. The reduction of a major waterfall to rapids may take tens of thousands of years.

Eventually, the rapids, too, will be eroded away. Other erosional features created by streams are canyons and V-shaped valleys.

On plateaus and in mountains, a stream erodes a fairly narrow path through the landscape, often only as wide as its channel.

It does so because most of its erosional force is directed along its bed. As the stream erodes downward, a process referred to as downcutting, steep slopes remain on either side of the stream's channel.

If the stream is cutting through a region composed of rocks that are highly resistant to erosion, a narrow, steep-walled canyon is created.

For further information, see the Canyon chapter. If the rocks in the region are more susceptible to erosion, rockslides and other types of landslides gradually modify the steep slopes to form a V-shaped valley.

For further information, see the Valley chapter. In addition to bars and islands in braided streams and point bars in meandering streams, streams create larger features by depositing sediment.

Among these are floodplains, alluvial fans, and deltas. When the flow of water in a stream becomes too high to be accommodated in the stream's channel, the water flows over the stream's banks and floods the surrounding land.

As it does so, the water immediately slows down and drops its sediment load. Coarser sediment is deposited near the channel. Over time, as the process is repeated over and over, the sediment forms mounds called natural levees along the stream's banks.

Finer sediment carried by the flood is spread farther away from the channel before it is finally deposited. The flat or gently sloping surface created by the repeated deposition of sediment along a stream is called the stream's floodplain.

A floodplain is widened as a stream meanders across a landscape. When a stream whose channel has been confined in a narrow valley or canyon in a highland area flows out into a broader, flatter valley or plain, its velocity and gradient suddenly decrease.

No longer confined to a narrow channel, the water spreads farther as it moves away from the base of the highlands.

Large rocks and other heavy material are deposited first, followed by other material in decreasing size. As more water flows onto the valley and more sediment is deposited, a wide, fan-shaped pile known as an alluvial fan forms.

When a stream enters a body of standing water, such as an ocean or a lake, again there is a sudden decrease in velocity.

The stream drops its sediment load in a deposit called a delta. Deltas build outward from a coastline, but will survive only if ocean currents are not strong enough to remove the sediment.

As the velocity of a stream decreases on entering the delta, the stream becomes choked with sediment, similar to what occurs in a braided stream channel.

Instead of braiding, however, the stream channel breaks into many smaller channels called distributaries that carry water and sediment to the delta's edges.

For further information, see the Delta chapter. Water running down a slope becomes a stream when there is enough water to form a tiny rivulet with a channel to contain the water.

In its early stage, a stream may carry water only after rain falls or snow melts. In this instance, it is said to be an intermittent stream.

In contrast, a permanent stream is one that has cut its valley deeply enough so that ground-water seeps into it and keeps it flowing between rainfalls.

Beneath Earth's surface, water fills the pore spaces and openings in rocks. This water, which comes from rain or melted snow that is drawn downward through the soil by gravity, is known as groundwater.

At a certain level below ground, all the openings in the rocks are completely filled with groundwater. The upper surface of this saturated zone is known as the water table.

A stream has a natural tendency to reach a base level. This refers to the point at which the stream reaches the elevation of the large body of water, such a lake or ocean, into which it drains.

Aided by gravity, a stream flows toward the level of its final destination as quickly as possible. The larger the difference in height between the stream and its destination, the greater the erosive or cutting force of the stream.

For most larger streams, base level is sea level. For tributaries, smaller streams that flow into larger ones, base level is the entry point where they empty into the larger stream.

Streams erode because they have the ability to pick up sediment and transport it to a new location. That sediment may come from several sources: It may have been eroded from the bed and banks of the stream, or it may have fallen into the stream after moving slowly or quickly down a slope bordering the stream's channel.

A stream erodes through two actions: hydraulic action and abrasion. Hydraulic action is the force exerted by the water itself.

It tends to work along the banks of streams, attacking and undermining layers of soil and rock. Abrasion is the grinding and scraping of the stream's banks and bed by the sediment carried in the stream as the suspended load and bed load.

And a loss of depth. The slope of the riverbed here is nearly level, so the movement of water slows; shallowness heightens the impression of transparency and a feeling for the texture of the highly polished stones just underwater.

If you bring your eye to within a few inches of the surface, each stone appears to be submerged in glycerin yet still sharply etched, as if held closely under a strong magnifying glass in summer light.

The amount of sediment a stream moves depends on the velocity of the stream and the size of the sediment particles.

Water moving at a low velocity can move only small, fine particles such as sand, silt, and clay. Sand is a mineral particle with a diameter between 0.

Water moving at a high velocity can move both small particles and large, coarse particles such as boulders. Stages of stream development: a youthful stream, mature stream, and old age stream.

A stream will continue to carry its load as long as its velocity remains constant or increases if it increases, it can carry an even larger load.

Any change in the geography of the landscape that causes a stream channel to bend or rise lessening its gradient will slow the flow of water in the channel.

As soon as a stream's velocity decreases, it loses the ability to carry all of its load and a portion will be deposited, depending on how much the stream slows down.

Particles will be deposited by size with the largest settling out first. Geologists characterize streams as youthful, mature, and old.

Typically, streams have steep gradients near their sources, or beginnings, and gentle gradients as they approach their mouths, or ends. Discharge increases downstream as more tributaries connect with main streams as they flow toward their base levels.

Because of this, stream channels also become deeper and wider downstream. A youthful stream has a fairly straight channel and a steep gradient.

It generally flows in a V-shaped valley in a highland or mountainous area with little shifting of its channel.

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