EFFECTS OF
UNDERGROUND WATER OVERUSE
by Anton
Antonio
June 15, 2015
“Earth’s surface area
is 510 million square kilometers. 149 million square kilometers is land
while 361 square kilometers is water. This translates to 70.8% of the
Earth’s surface is water while 29.2% is land. This simply means that a
majority of the Earth’s surface is water and our planet is predominantly viewed
as a liquid planet. This is great news, isn’t it? Water, being
a life-support element, perpetuates the existence of life forms on Earth.
But wait, and here’s the bad news… most of the water available to us is unfit
for human consumption. Although 70.8% of the Earth’s surface is water,
only 3.5% of this is fresh water which is actually consumable… 96.5% is salt
water and is unfit for human consumption. Other sources of fresh water
are water vapour which exists in the air, rivers and lakes, and icecaps and
glaciers; which, however, are quite difficult to estimate. All these
point to an abundance of water supply for humanity. But is 361 million
square kilometers of water usable?... hardly not. The total water volume on Earth is calculated
to be 326 million trillion gallons and the total fresh water available for
human consumption is 11 million trillion gallons. The daily requirement
of an individual is 1 gallon; meaning, human consumption of fresh water is
estimated at 7 billion gallons on the assumption that the total world
population is 7 billion. Other consumption like industrial, business,
household and other related applications are not yet included in the total
daily consumption of 7 billion gallons.” (Antonio, 2014)
The most visible sources of fresh water are rivers and
lakes. But this is not all because there
is more than 20 times as much water stored within the ground as in all lakes
and rivers combined. More often, in many
parts of the world, underground water had to be pumped out to meet the huge
demand for water (domestic consumption, industrial and agricultural use).
There are many effects of underground water overuse and over
pumping. This article, however, will
focus on only two: (1) the lowering of the water table, therefore reducing
water supply; and, (2) land collapse in a process called subsidence (meaning:
the gradual caving-in or sinking of an area of land). In San Joaquin Valley, California, USA, an
experiment was conducted and it resulted to the discovery that excessive
pumping for irrigation led to nearly 30 feet of subsidence in the span of 50
years.
Global warming has gradually increase sea level due to
melting polar caps. With the sea level
gradually increasing because of global warming and the ground level sinking
because of subsidence, it should be a worrisome day when these two phenomena
meet somewhere. But before this event
comes to pass, let us consider alternative measures towards water conservation…
or we will surely experience the effects of underground water overuse.
Just my
little thoughts…
(Please
visit, like and share Pro EARTH Crusaders on Facebook or follow me at http://antonantonio.blogspot.com/)
REFERENCE:
Antonio, A. C. (2014). “How Much Water Do We Have?”.
Retrieved on June 15, 2015 from http://antonantonio.blogspot.com/2014/10/how-much-water-do-we-have.html
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