free water
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8/18/2019 Free Water
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Limited resource[edit]
Fresh water is a renewable and variable, but finite natural resource. Fresh water
can only be replenished through the process of the water cycle, in which water
from seas, lakes, forests, land, rivers, and reservoirs evaporates, forms clouds, and
returns as precipitation. Locally however, if more fresh water is consumed through
human activities than is naturally restored, this may result in reduced fresh water
availability from surface and underground sources and can cause serious damage to
surrounding and associated environments.
Fresh water withdrawal[edit]
Fresh water withdrawal is the quantity of water removed from available sources for
use in any purpose, excluding evaporation losses. ater drawn off is not
necessarily entirely consumed and some portion may be returned for further use
downstream.
Causes of limited fresh water[edit]
!here are many causes of the apparent decrease[citation needed ] in our fresh water
supply. "rincipal amongst these is the increase in population through increasing
life expectancy, the increase in per capita water use and the desire of many people
to live in warm climates that have naturally low levels of fresh water resources.[citation needed ] #limate change is also likely to change the availability and distribution
of fresh water across the planet$
%&f global warming continues to melt glaciers in the polar regions, as expected, the
supply of fresh water may actually decrease. First, fresh water from the melting
glaciers will mingle with salt water in the oceans and become too salty to drink.
'econd, the increased ocean volume will cause sea levels to rise, contaminating
freshwater sources along coastal regions with seawater(.[)*]
!he orld +ank adds that the response by freshwater ecosystems to a changing
climate can be described in terms of three interrelated components$ water quality,
water quantity or volume, and water timing. change in one often leads to shifts inthe others as well.[)-] ater pollution and subsequent eutrophication also reduces
the availability of fresh water .[)]
lso, there is an uneven distribution of fresh water. hile some countries have an
abundant supply of fresh water, others do not have as much. For
example, #anada has /01 of the world2s fresh water supply, while &ndia has only
https://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=8https://en.wikipedia.org/wiki/Water_cyclehttps://en.wikipedia.org/wiki/Reservoirshttps://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=9https://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=10https://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttps://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttps://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttps://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttps://en.wikipedia.org/wiki/Climate_changehttps://en.wikipedia.org/wiki/Fresh_water#cite_note-16http://water.worldbank.org/water/publications/water-and-climate-change-understanding-risks-and-making-climate-smart-investment-decisihttps://en.wikipedia.org/wiki/Fresh_water#cite_note-17https://en.wikipedia.org/wiki/Water_pollutionhttps://en.wikipedia.org/wiki/Eutrophicationhttps://en.wikipedia.org/wiki/Fresh_water#cite_note-18https://en.wikipedia.org/wiki/Fresh_water#cite_note-18https://en.wikipedia.org/wiki/Canadahttps://en.wikipedia.org/wiki/Water_cyclehttps://en.wikipedia.org/wiki/Reservoirshttps://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=9https://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=10https://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttps://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttps://en.wikipedia.org/wiki/Climate_changehttps://en.wikipedia.org/wiki/Fresh_water#cite_note-16http://water.worldbank.org/water/publications/water-and-climate-change-understanding-risks-and-making-climate-smart-investment-decisihttps://en.wikipedia.org/wiki/Fresh_water#cite_note-17https://en.wikipedia.org/wiki/Water_pollutionhttps://en.wikipedia.org/wiki/Eutrophicationhttps://en.wikipedia.org/wiki/Fresh_water#cite_note-18https://en.wikipedia.org/wiki/Canadahttps://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=8
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8/18/2019 Free Water
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)01 of the world2s fresh water supply, even though &ndia2s population is more than
30 times larger than that of #anada. reason for the uneven distribution of fresh
water supply may be the differences in climate. For example, in some countries in
frica, the frequent lack of rain has led to insufficient water supply for irrigation.
!his has affected agriculture and has led to a shortage of food for the people.[)4]
Fresh water in the future[edit]
5any areas of the world are already experiencing stress on water availability. 6ue
to the accelerated pace of population growth and an increase in the amount of
water a single person uses, it is expected that this situation will continue to get
worse. shortage of water in the future would be detrimental to the human
population as it would affect everything from sanitation, to overall health and the
production of grain.[/0]
Choices in the use of fresh water[edit]
ith one in eight people in the world not having access to safe water [/)] it is
important to use this resource in a prudent manner. 5aking the best use of water on
a local basis probably provides the best solution. Local communities need to plan
their use of fresh water and should be made aware of how certain crops and
animals use water.
s a guide the following tables provide some indicators.
!able ) 7ecommended basic water requirements for human needs 8per person9
https://en.wikipedia.org/wiki/Indiahttps://en.wikipedia.org/wiki/Fresh_water#cite_note-19https://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=11https://en.wikipedia.org/wiki/Fresh_water#cite_note-20https://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=12https://en.wikipedia.org/wiki/Fresh_water#cite_note-21https://en.wikipedia.org/wiki/Indiahttps://en.wikipedia.org/wiki/Fresh_water#cite_note-19https://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=11https://en.wikipedia.org/wiki/Fresh_water#cite_note-20https://en.wikipedia.org/w/index.php?title=Fresh_water&action=edit§ion=12https://en.wikipedia.org/wiki/Fresh_water#cite_note-21
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