Drainage basin

A drainage basin is any area of land where

precipitation

collects and drains off into a common outlet, such as into a

river

, bay, or other body of water. The drainage basin includes all the surface water from rain runoff, snowmelt, hail, sleet and nearby streams that run downslope towards the shared outlet, as well as the

groundwater

underneath the earth's surface. Drainage basins connect into other drainage basins at lower elevations in a hierarchical pattern, with smaller sub-drainage basins, which in turn drain into another common outlet.

Other terms for ''drainage basin'' are catchment area, catchment basin, drainage area, river basin, water basin, and impluvium. In

North America

, the term ''watershed'' is commonly used to mean a drainage basin, though in other English-speaking countries, it is used only in its original sense, that of a drainage divide.

In a closed drainage basin, or endorheic basin, the water converges to a single point inside the basin, known as a sink, which may be a permanent lake, a dry lake, or a point where surface water is lost underground.

The drainage basin acts as a

funnel

by collecting all the water within the area covered by the basin and channelling it to a single point. Each drainage basin is separated topographically from adjacent basins by a perimeter, the drainage divide, making up a succession of higher geographical features (such as a

ridge

,

hill

or

mountain

s) forming a barrier.

Drainage basins are similar but not identical to hydrologic units, which are drainage areas delineated so as to nest into a multi-level hierarchical drainage system. Hydrologic units are defined to allow multiple inlets, outlets, or sinks. In a strict sense, all drainage basins are hydrologic units but not all hydrologic units are drainage basins.

Major drainage basins of the world

Ocean basins

The following is a list of the major ocean basins:
* About 48.71% of the world's land drains to the

Atlantic Ocean

. In

North America

, surface water drains to the Atlantic via the Saint Lawrence River and

Great Lakes

basins, the Eastern Seaboard of the United States, the

Canadian Maritimes

, and most of Newfoundland and Labrador. Nearly all of

South America

east of the Andes also drains to the Atlantic, as does most of

Western

and Central Europe and the greatest portion of western

Sub-Saharan Africa

, as well as

Western Sahara

and part of

Morocco

. The two major mediterranean seas of the world also flow to the Atlantic:
** The Caribbean Sea and

Gulf of Mexico

basin includes most of the U.S. interior between the Appalachian and

Rocky Mountains

, a small part of the Canadian provinces of Alberta and Saskatchewan, eastern Central America, the islands of the Caribbean and the Gulf, and a small part of northern South America.
** The Mediterranean Sea basin includes much of

North Africa

, east-central

Africa

(through the Nile River),

Southern

, Central, and Eastern Europe,

Turkey

, and the coastal areas of

Israel

,

Lebanon

, and

Syria

.
* The

Arctic Ocean

drains most of Western and

Northern Canada

east of the Continental Divide, northern Alaska and parts of North Dakota,

South Dakota

,

Minnesota

, and

Montana

in the United States, the north shore of the Scandinavian peninsula in Europe, central and northern Russia, and parts of

Kazakhstan

and

Mongolia

in Asia, which totals to about 17% of the world's land.
* Just over 13% of the land in the world drains to the

Pacific Ocean

. Its basin includes much of China, eastern and southeastern Russia, Japan, the Korean Peninsula, most of Indochina, Indonesia and Malaysia, the Philippines, all of the Pacific Islands, the northeast coast of

Australia

, and Canada and the United States west of the Continental Divide (including most of Alaska), as well as western Central America and South America west of the Andes.
* The

Indian Ocean

's drainage basin also comprises about 13% of Earth's land. It drains the eastern coast of Africa, the coasts of the

Red Sea

and the Persian Gulf, the Indian subcontinent, Burma, and most of Australia.
* The

Southern Ocean

drains

Antarctica

. Antarctica comprises approximately eight percent of the Earth's land.

Largest river basins

The five largest river basins (by area), from largest to smallest, are the basins of the Amazon (7M km), the Congo (4M km), the Nile (3.4M km), the

Mississippi

(3.22M km), and the

Río de la Plata

(3.17M km). The three rivers that drain the most water, from most to least, are the Amazon,

Ganga

, and Congo rivers.

Endorheic drainage basins

Endorheic drainage basins are inland basins that do not drain to an ocean. Around 18% of all land drains to endorheic lakes or seas or sinks. The largest of these consists of much of the interior of Asia, which drains into the Caspian Sea, the

Aral Sea

, and numerous smaller lakes. Other endorheic regions include the Great Basin in the United States, much of the

Sahara Desert

, the drainage basin of the

Okavango River

(Kalahari Basin), highlands near the

African Great Lakes

, the interiors of

Australia

and the Arabian Peninsula, and parts in

Mexico

and the Andes. Some of these, such as the Great Basin, are not single drainage basins but collections of separate, adjacent closed basins.

In endorheic bodies of standing water where evaporation is the primary means of water loss, the water is typically more saline than the oceans. An extreme example of this is the Dead Sea.

Importance

Geopolitical boundaries

Drainage basins have been historically important for determining territorial boundaries, particularly in regions where trade by water has been important. For example, the

English

crown gave the Hudson's Bay Company a monopoly on the fur trade in the entire Hudson Bay basin, an area called Rupert's Land. Bioregional political organization today includes agreements of states (e.g., international

treaties

and, within the US, interstate compacts) or other political entities in a particular drainage basin to manage the body or bodies of water into which it drains. Examples of such interstate compacts are the Great Lakes Commission and the Tahoe Regional Planning Agency.

Hydrology

In hydrology, the drainage basin is a logical unit of focus for studying the movement of water within the hydrological cycle, because the majority of water that discharges from the basin outlet originated as precipitation falling on the basin. A portion of the water that enters the

groundwater

system beneath the drainage basin may flow towards the outlet of another drainage basin because groundwater flow directions do not always match those of their overlying drainage network. Measurement of the discharge of water from a basin may be made by a stream gauge located at the basin's outlet. Depending on the conditions of the drainage basin, as rainfall occurs some of it seeps directly into the ground. This water will either remain underground, slowly making its way downhill and eventually reaching the basin, or it will permeate deeper into the soil and consolidate into groundwater aquifers.

As water flows through the basin, it can form tributaries that change the structure of the land. There are three different main types, which are affected by the rocks and ground underneath. Rock that is quick to erode forms dendritic patterns, and these are seen most often. The two other types of patterns that form are trellis patterns and rectangular patterns.

Rain gauge data is used to measure total precipitation over a drainage basin, and there are different ways to interpret that data. If the gauges are many and evenly distributed over an area of uniform precipitation, using the arithmetic mean method will give good results. In the Thiessen polygon method, the drainage basin is divided into polygons with the rain gauge in the middle of each polygon assumed to be representative for the rainfall on the area of land included in its polygon. These polygons are made by drawing lines between gauges, then making perpendicular bisectors of those lines form the polygons. The

isohyet

al method involves contours of equal precipitation are drawn over the gauges on a map. Calculating the area between these curves and adding up the volume of water is time-consuming.

Isochrone maps can be used to show the time taken for runoff water within a drainage basin to reach a lake, reservoir or outlet, assuming constant and uniform effective rainfall.

Geomorphology

Drainage basins are the principal hydrologic unit considered in fluvial

geomorphology

. A drainage basin is the source for water and

sediment

that moves from higher elevation through the river system to lower elevations as they reshape the channel forms.

Ecology

Drainage basins are important in ecology. As water flows over the ground and along rivers it can pick up nutrients, sediment, and

pollutants

. With the water, they are transported towards the outlet of the basin, and can affect the ecological processes along the way as well as in the receiving water source.

Modern use of artificial fertilizers, containing nitrogen, phosphorus, and potassium, has affected the mouths of drainage basins. The minerals are carried by the drainage basin to the mouth, and may accumulate there, disturbing the natural mineral balance. This can cause

eutrophication

where plant growth is accelerated by the additional material.

Resource management

Because drainage basins are coherent entities in a hydrological sense, it has become common to manage water resources on the basis of individual basins. In the U.S. state of

Minnesota

, governmental entities that perform this function are called " watershed districts". In New Zealand, they are called catchment boards. Comparable community groups based in Ontario, Canada, are called conservation authorities. In North America, this function is referred to as "watershed management".
In Brazil, the National Policy of Water Resources, regulated by Act n° 9.433 of 1997, establishes the drainage basin as the territorial division of Brazilian water management.

When a river basin crosses at least one political border, either a border within a nation or an international boundary, it is identified as a transboundary river. Management of such basins becomes the responsibility of the countries sharing it. Nile Basin Initiative,

OMVS

for Senegal River,

Mekong River Commission

are a few examples of arrangements involving management of shared river basins.

Management of shared drainage basins is also seen as a way to build lasting peaceful relationships among countries.

Catchment factors

The catchment is the most significant factor determining the amount or likelihood of

flooding

.

Catchment factors are: topography, shape, size,

soil

type, and land use (paved or

roof

ed areas). Catchment topography and shape determine the time taken for

rain

to reach the river, while catchment size, soil type, and development determine the amount of water to reach the river.

Topography

Generally, topography plays a big part in how fast runoff will reach a river. Rain that falls in steep

mountain

ous areas will reach the primary river in the drainage basin faster than flat or lightly sloping areas (e.g., > 1% gradient).

Shape

Shape will contribute to the speed with which the runoff reaches a river. A long thin catchment will take longer to drain than a circular catchment.

Size

Size will help determine the amount of water reaching the river, as the larger the catchment the greater the potential for flooding. It is also determined on the basis of length and width of the drainage basin.

Soil type

Soil type will help determine how much water reaches the river. The runoff from the drainage area is dependent on the soil type. Certain soil types such as

sand

y soils are very free-draining, and rainfall on sandy soil is likely to be absorbed by the ground. However, soils containing

clay

can be almost impermeable and therefore rainfall on clay soils will run off and contribute to flood volumes. After prolonged rainfall even free-draining soils can become saturated, meaning that any further rainfall will reach the river rather than being absorbed by the ground. If the surface is impermeable the precipitation will create surface run-off which will lead to higher risk of flooding; if the ground is permeable, the precipitation will infiltrate the soil.

Land use

Land use can contribute to the volume of water reaching the river, in a similar way to clay soils. For example, rainfall on roofs, sidewalk, pavements, and roads will be collected by rivers with almost no absorption into the

groundwater

.

See also

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*Catchment hydrology

References

Citations

Sources

* DeBarry, Paul A. (2004). ''Watersheds: Processes, Assessment and Management.'' John Wiley & Sons.

External links

Instructional video: Manual watershed delineation is a five-step process

Instructional video: To delineate a watershed you must identify land surface features from topographic contours

Science week catchment factsheet

Catchment Modelling Toolkit

Water Evaluation And Planning System (WEAP) - modeling hydrologic processes in a drainage basin

New Mexico State University - Water Task Force



Watershed Condition Classification Technical Guide
United States Forest Service

''Science in Your Watershed''
USGS

''Studying Watersheds: A Confluence of Important Ideas''

''Water Sustainability Project'' Sustainable water management through demand management and ecological governance, with the POLIS Project at the University of Victoria

Map of the Earth's primary watersheds
World Resources Institute, WRI

What is a watershed and why should I care?

Cycleau - A project looking at approaches to managing catchments in North West Europe


* [http://web.mit.edu/star/hydro StarHydro – software tool that covers concepts of fluvial geomorphology and watershed hydrology]

EPA Surf your watershed

Florida Watersheds and River Basins - Florida DEP

{{Authority control

Drainage basins,
Fluvial landforms
Freshwater ecology
Geomorphology
Hydrology
Rivers
Water and the environment
Water streams