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Water for All through Desalination and Dams? World Water Crisis 101 (Part 2)

Water for All through Desalination and Dams? World Water Crisis 101 (Part 2)

Care2 Earth Month: Back to Basics

This year, Care2 decided to expand Earth Day into Earth Month, since there is so much to explore when it comes to the environment. Every day in April, we’ll have a post about some of the most important topics for the environment, exploring and explaining the basics. It’s a great tool to help you get started with helping the environment — or help explain it to others. See the whole series here.

Growing Demand for a Limited Supply of Water

In part 1 of World Water Crisis 101, we explored the problem of water scarcity and water pollution in the face of global population growth. Already, 2.7 billion people are affected by water shortages and, by 2025, and two-thirds of the world’s population could be living under water stressed conditions.

Fact: How the world uses freshwater:

  • about 70 percent for irrigation
  • about 22 percent for industry
  • about 8 percent for domestic use

Source: World Water Assessment Programme (WWAP)

Water scarcity and polluted water supplies have an enormous impact human health, food production, and economic growth. Solutions to scarcity include moving water from far away, filtering ocean water for drinking, improving agricultural practices and urban water conservation, and safeguarding the available supply by reducing pollution. In part 2 of World Water Crisis, we’ll take a look at desalination and water diversions.

Desalination – Drinking Water from the Sea

Nearly 10 years into record drought conditions in Australia, 5 major cities are turning to ocean desalination to solve their water woes. About half of the world’s current capacity to filter drinkable water from salty ocean water is installed in the middle east, with Israel on track to provide 75 percent of the nations water supply from the sea.

The technology remains controversial, especially in countries with less dire water shortages. Reverse osmosis plants to desalinate seawater are expensive and require enormous amounts of energy to run. Pollution from the energy used by the plants would very likely contribute to global warming, which is expected to exacerbate world water shortages. The resulting brine, super-salty wastewater, has to go somewhere and pumping it back into coastal environments could upset delicate ecosystem balances.

Dams and Aqueducts – Drinking Water from Far Away

Freshwater is not evenly distributed around the world. Even relatively water rich nations may have regional scarcity problems and many cities have grown up in places with inadequate water to support their modern populations.

Fact: In 60 percent of European cities with more than 100,000 people, groundwater is being used at a faster rate than it can be replenished.

Source: World Business Council For Sustainable Development (WBCSD)

Many proposed solutions to water scarcity assumes that water is portable. Nations have long dammed rivers to create reservoirs of water for cities and farms. Dams have been controversial and damaging to the local ecosystems.

Simple dams and reservoirs are nothing compared to the kinds of projects being proposed to meet growing urban water demands around the world. It has long been a fear of the U.S. Great Lakes states that population growth in the Southwest will lead to grand projects to divert water from the lakes or upper Mississippi River to supply Phoenix, Tempe, and Albuquerque.

Before you dismiss the fear as ridiculous, remember that the Colorado River was diverted to supply Los Angeles more than a century ago. The state of Nevada recently approved a series of pipelines and pumping stations to move groundwater hundreds of miles from the east to the city of Las Vegas.  And China is undertaking a project that the New York Times is comparing with diverting the Mississippi to supply Boston, Massachusetts.

China to Build the World’s Largest Water Diversion Project

China began construction on a canal and aqueduct project in 2002 that will ultimately divert 6 trillion gallons of water every year from the southern Yangztee River to supply the arid plains in the north.

“Since 2002, China has spent 138 billion yuan ($22 billion) on the project and expects to spend another 64 billion yuan ($10 billion) this year alone. The government has also relocated 330,000 people who lived near a reservoir on one of the routes.” – The New York Times

Massive Water Diversions Come with Big Costs

Such enormous engineering projects may sound appealing, but moving water – both heavy and bulky – over great distances takes a tremendous amount of energy.  For example, California spends nearly 20 percent of its electricity use to moving water around.

On the environmental impacts of such schemes, Brian Richter of The Nature Conservancy and University of Virginia writes:

“We should be careful about ‘robbing Peter to pay Paul.’ As we dry up a river or lake to harvest or export its water, the health of fish populations and natural freshwater ecosystems plummet.  In virtually all of the large rivers that have begun to go dry, fisheries have been decimated, leading to severe hardship for local people that depend upon that food source for their subsistence and livelihoods.  Last year, I published a journal paper with colleagues at The Nature Conservancy that suggested that depletion of a freshwater source by more than 20% will likely have harmful ecological and social consequences.”

World Water Crisis 101 (Part 3) – If Desalination and Massive Water Diversions Are Not The Solution, What Is?

In part 3 of our series, we’ll explore water conservation, sanitation improvements, and pollution prevention. If you missed Are We Running Out of Water? World Water Crisis 101 (Part 1), check it out.

Related Stories

Running Out of Water? World Water Crisis 101 (Part 1)

What Is Water Worth?

Desalination Will Soon Provide 75% Of Israel’s Drinking Water

Yemen’s Capital Could Run Out Of Water by 2025

Read more: , , , , , , , , , , , ,

Photo of the Three Gorges Dam in China by Thinkstockphoto.com

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54 comments

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11:38AM PDT on Mar 25, 2013

Thank you for sharing.

8:20PM PDT on May 9, 2012

Time to speak up TOGETHER! WORLD CITIZENS PETITION OBAMA: SOLVE FUKUSHIMA - PLEASE SIGN - GO VIRAL!

President of the United States: Urgent Request for UN Intervention to Stabilize Fukushima Reactor Unit 4. http://change.org/petitions/the-president-of-the-united-states-urgent-request-on-un-intervention-to-stabilize-the-fukushima-reactor-unit-4

6:09AM PDT on May 3, 2012

Israel explore and have new more environment respectful ideas for desalination...About Dam the fact is the Bello Monto, a big dam in Amazon, is construct specially for mining industry. Mining industry who massively pollute ground and water: a vicious circle!

8:54PM PDT on Apr 16, 2012

Thank-you for the article~♥

10:30AM PDT on Apr 16, 2012

Over population is the key - we can't keep on thinking that diverting & damming doesn't affect other things on Our Planet.

10:19AM PDT on Apr 16, 2012

All this to get a quart out of a pint pot:- there's too many mouths to feed (& thirsts to quench ).
There should be a STOP to unlimited Population Growth cos we can't deal with it.

7:52PM PDT on Apr 15, 2012

thank you for that, read the first onek, too. we need to conserve much more and be mindful - especially in the US which is terribly wasteful with all resources

11:13AM PDT on Apr 15, 2012

One way to use less water is to use crops that do not need the massive amount of irrigation that Monsanto developed and is forcing Indian farmers to use. These crops fail so the company takes the land and the farmer suicides.

The government provides a better seed that does not require the same amount of irrigation at 20% of cost.

Then you have companies like Coca Cola that the gvoernment agrees to close because of the amount of underground water being used but the company just bribe their way through to keep open.

Many Africans see cattle as their wealth and refuse to kill any of them in drought conditions so they die a terrible death of thirst.

It is knowing what these companies do and yet no-one stops them that is a part of the problem. Israel has been researching into food crops for desert conditions and would be glad to share the research. Perhaps if we look at changing our diet and way of life too, as above, which would also help.

11:06AM PDT on Apr 15, 2012

Desalinization can be cheap and easy. Pump the cold deep water up and through a green house with open ponds of salt water. The sun will evaporate the water from the ponds. The cold deep water will run through finned pipes through these green houses. The water will condense onto these cold pipes and fall into catchment systems that will then supply tanks of distilled water. The then saltier water will have a higher density. This will be used to fall down a piping system back into the ocean. This will drag the cold water to the surface. If done properly, this will be a self sustaining siphon with not added energy input.

11:29AM PDT on Apr 14, 2012

there are lots of innovations that can be used in agriculture that minimize the use of water. But big-business agriculture has no desire to change. Their bottom line is profit NOW, with no care for how they are wracking up a huge bill that will need to be paid later, and destroying the environment.

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