# What is the velocity of a stream?

Stream velocity is the speed of the water in the stream. Units are distance per time (e.g., meters per second or feet per second). Stream velocity is greatest in midstream near the surface and is slowest along the stream bed and banks due to friction.

Moreover, what are the factors affecting the velocity of a river?

Factors Affecting a River’s Velocity. The velocity of a river is determined by many factors, including the shape of its channel, the gradient of the slope that the river moves along, the volume of water that the river carries and the amount of friction caused by rough edges within the riverbed.

What factors affect stream flow?

Natural mechanisms

• Runoff from rainfall and snowmelt.
• Evaporation from soil and surface-water bodies.
• Transpiration by vegetation.
• Ground-water discharge from aquifers.
• Ground-water recharge from surface-water bodies.
• Sedimentation of lakes and wetlands.
• Formation or dissipation of glaciers, snowfields, and permafrost.
• What factors affect the speed of an object?

The factors affecting the terminal speed of a falling object include:

• its mass.
• its surface area.
• the acceleration due to gravity, g.
• ## What are the factors affecting the velocity of a river?

Factors Affecting a River’s Velocity. The velocity of a river is determined by many factors, including the shape of its channel, the gradient of the slope that the river moves along, the volume of water that the river carries and the amount of friction caused by rough edges within the riverbed.

## What type of valley is formed from streams?

The exact shape will depend on the characteristics of the stream flowing through it. Rivers with steep gradients, as in mountain ranges, produce steep walls and a bottom. Shallower slopes may produce broader and gentler valleys.

## What factors affect stream flow?

Natural mechanisms

• Runoff from rainfall and snowmelt.
• Evaporation from soil and surface-water bodies.
• Transpiration by vegetation.
• Ground-water discharge from aquifers.
• Ground-water recharge from surface-water bodies.
• Sedimentation of lakes and wetlands.
• Formation or dissipation of glaciers, snowfields, and permafrost.
• ## Why does velocity increase as you go downstream?

Velocity increases as more water is added to rivers via tributary rivers. This means that less of the water is in contact with the bed of the river and the mouth so there is less energy used to overcome friction. Hence rivers flow progressively faster on their journey downstream.

## How do streams erode their beds?

Lesson Summary

• Streams erode the land as they move from higher elevations to the sea.
• Eroded materials can be carried in a river as dissolved load, suspended load, or bed load.
• A river erodes deeply when it is far from its base level, the place where it enters standing water.
• Streams form bends, called meanders.
• ## How does the shape of a stream channel affect flow?

Stream energy. Flow velocity controls the stream’s capacity to erode and transport sediment through its channel. Generally, the larger the discharge, the smoother the channel, greater the stream velocity. Cross-sectional area and discharge increases down stream due to tributary and ground water flow into the channel.

## What is the meaning of free stream velocity?

The freestream is the air far upstream of an aerodynamic body, that is, before the body has a chance to deflect, slow down or compress the air. Freestream conditions are usually denoted with a symbol, e.g. , meaning the freestream velocity.

## How does the gradient of the stream affect the velocity of the stream?

The gradient of a river is defined as grade measured in by the ratio of drop in elevation of a stream per unit of horizontal distance (in other words, the “steepness” of a river). Likewise, the steeper the river’s gradient, the faster the flow of water (due to the pull of water down the gradient by gravity).

## What is a stream gauge used for?

Stream gaging is a technique used to measure the discharge, or the volume of water moving through a channel per unit time, of a stream. The height of water in the stream channel, known as a stage or gage height, can be used to determine the dischage in a stream.

## What is the velocity of the river?

The velocity will change along the course of any river, and is determined by factors such as the gradient ( how steeply the river is losing height), the volume of water, the shape of the river channel and the amount of friction created by the bed, rocks and plants.

## How do stream terraces develop?

Stream terraces form when streams carve downward into their floodplains, leaving discontinuous remnants of older floodplain surfaces as step-like benches along the sides of the valley. Streams broadened their floodplains when sediment supplies are high and down cutting by stream erosion is abated.

## What is river gauging?

The term stream gauging is used to mean measurement of discharge as well as river water level or stage in a general way. However, when a term gauge record is used it only means a record of river stages or water levels.

## What is the base level of a stream?

The “base level” of a river or stream is the lowest point to which it can flow, often referred to as the ‘mouth of the river’. For large rivers, sea level is usually the base level, but a large river or lake is likewise the base level for tributary streams.

## What is the profile of a stream?

Typically, streams are said to have a particular 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.

## What is the float method?

The process involved in the float method of measuring velocity is by observing the time for a floating body to traverse a known length and noting its position in the channel. A subsurface float consists of a submerged float attached to a surface float by an adjustable line and it measures directly the mean velocity.

## How do vegetation and slope affect runoff?

Soil saturation: Like a wet sponge, soil already saturated from previous rainfall can’t absorb much more thus more rainfall will become surface runoff. Vegetation can slow the movement of runoff, allowing more time for it to seep into the ground.

## What is the capacity of a stream?

Stream capacity is a measure of the total sediment (material other than water) a stream can carry. Stream competence reflects the ability of a stream to transport a particular size of particle (e.g., boulder, pebble, etc).

## How does a stream transport sediment?

Sediments are moved by streams in different ways. Fine grained particles and dissolved components are carried in suspension (called the suspended load). The shape of a stream channel and the stream gradient controls the amount of sediment that can be transported down stream.

## How are flood plains formed?

Formation. Floodplains are made by a meander eroding sideways as it travels downstream. When a river breaks its banks, it leaves behind layers of alluvium (silt). These gradually build up to create the floor of the plain.

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