Thursday, December 14, 2006

Satellites Weigh Africa's Water










Satellites Weigh Africa's Water


By Jonathan Amos Science reporter, BBC News, San Francisco

Photo above:
The Grace twins weigh the changes in the storage of water on land.

Africa has experienced a significant drying in the past three years, new satellite data reveals.
The volume of water lost from the land amounts to 334 cubic km, which is almost as much as all Africans have consumed over the period.

The data comes from Nasa spacecraft that can detect changes in gravity caused by water as it cycles between the sea, the atmosphere and the land.

Experts stress no firm conclusions should be drawn from the short study. Professor Jay Famiglietti from the University of California-Irvine said much longer times series were needed to detect real trends and any signal that might indicate a significant shift in climate. "There are natural climate variations, the natural ups and downs," he explained.

"Another big factor is human control of the water cycle - reservoir management, the storage of water on continents. "Groundwater mining leads to heavy depletions of water. Wetland drainage, river diversion projects - all of those factors contribute to these storage variations that we see and we'll be working on trying to sort those out over the next few years," he told the BBC.
More at the link.
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Sunday, December 10, 2006

Water Levels In Lake Victoria Dropping Fast

Water Levels In African Lake Dropping fast

Excerpt:

By CHARLES J. HANLEY, AP Special Correspondent
Sat Dec 9, 1:12 PM ET

JINJA, Uganda - At Jinja pier the rusty red hull of a Lake Victoria freighter sat barely afloat in water just six feet deep — and dropping. "The scientists have to explain this," said ship's engineer Gabriel Maziku.

Across the bay, at a fish packing plant, fishermen had to wade ashore with their Nile perch in flat-bottomed boats, and heave the silvery catch up to a jetty that soon may be on dry land and out of reach entirely. Looking on, plant manager Ravee Ramanujam wondered about what's to come.

"Such a large body of water, dropping so fast," he said.

At 27,000 square miles, the size of Ireland, Victoria is the greatest of Africa's Great Lakes — the biggest freshwater body after Lake Superior. And it has dropped fast, at least six feet in the past three years, and by as much as a half-inch a day this year before November rains stabilized things.

The outflow through two hydroelectric dams at Jinja is part of the problem — a tiny part, says the Uganda government, or half the problem, say environmentalists. But much of what is happening to Victoria and other lakes across the heart of Africa is attributable to years of drought and rising temperatures, conditions that starve the lakes of inflowing water and evaporate more of the water they have.

An extreme example lies 1,500 miles northwest of here, deeper in the drought zone, where Lake Chad, once the world's sixth-largest, has shrunk to 2 percent of its 1960s size. And the African map abounds with other, less startling examples, from Lake Turkana in northern Kenya, getting half the inflow it once did, to the great Lake Tanganyika south of here, whose level dropped over five feet in five years.

"All these lakes are extremely sensitive to climate change," the U.N. Environment Program warned in a global water assessment two years ago.

Now, in a yet unpublished report obtained by The Associated Press, an international consulting firm advises the Ugandan government that supercomputer models of global-warming scenarios for Lake Victoria "raise alarming concerns" about its future and that of the Nile River, which begins its 4,100-mile northward journey here at Jinja.

The report, by U.S.-based Water Resources and Energy Management International, says rising temperatures may evaporate up to half the lake's normal inflow from rainfall and rivers, with "severe consequences for the lake and its ability to meet the region's water resources needs."

A further dramatic drop in Victoria's water levels might even turn off this spigot for the Nile, a lifeline for more than 100 million Egyptians, Sudanese and others.

"People talk about the snows of Kilimanjaro," said Aris P. Georgakakos, the study's chief author, speaking of that African mountain's melting glaciers. "We have something much bigger to worry about, and that's Lake Victoria."

Each troubled lake is a complex story.

Lake Chad's near-disappearance, for example, stems in part from overuse of its source waters for irrigation. Deforestation around Lake Victoria, shared by Uganda, Kenya and Tanzania, makes the area a less efficient rain "catchment" for the lake, and overfishing and pollution are damaging its $400-million-a-year fishing industry. Kenya's Rift Valley lakes, some just a few feet deep, have always fluctuated in size, even drying up with drought.

But African leaders say things are different this time, because long-term climate change may eclipse other factors.

"These cycles, when they've happened, they haven't happened under the circumstances pertaining now — the global warming, overpopulation, degradation," said Maria Mutagamba, Uganda's water and environment minister.

End of excerpt.
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Lake Victoria-Kenya

The Falling Waters Of Lake Victoria
Courtesy of NASA

Lake Victoria Project
Take a look at how the people in this region are caring for the ecosystems of the lake and involving children in this process.

UN Accuses Uganda Of Draining Lake Victoria

And now see how adults will continue to negate these good efforts:
Independent, The (London), Feb 9, 2006 by Tristan McConnell in Kampala

The United Nations has accused Uganda of draining Lake Victoria to maintain its electricity supplies, despite an impending environmental catastrophe as water levels in Africa's largest lake drop to their lowest in 80 years.

The water is three metres below its normal level, leaving the jetties where pleasure boats moor and the landing sites where fishermen sell their catch high above the water.

The falling water level is affecting 30 million people in Uganda, Tanzania and Kenya whose livelihoods depend on the lake. As the waters recede silt and vegetation are encroaching on the lake and goats nibble the green shoots where fish once swam in the shallows. Sudan and Egypt, both of which rely on the river Nile, which runs out of Lake Victoria, for their water supply and for agricultural irrigation, will also be affected. In October last year the UN warned African lakes were the worst affected by climate changes.
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The need for education regarding climate change is crucial in Africa. And of course, related to that is accountability for water diverted away from people who need it. Dams only cause problems related to water flow and environmental damage, and in essence create the very gases we need to reign in to mitigate the droughts being experienced in almost 40% of this world. The people of this region need alternate ways to create electricity, such as solar power. It is IMPERATIVE in order to maintain equality in water distribution and to help ensure that levels do not go any lower.

How much more of this will have to be reported on before we get it? This is a global catastrophe in the making unless we act now in order to provide developing countries with alternate energy sources to lift pressure off of water resources! And the key to this really is overpopulation and education that seeks to address this crisis at the roots. When is the world going to tackle this on a level that truly addresses the underlying problems as a whole instead of just putting bandaids on it? And that includes the UN. We are making our planet unsustainable for human life. Shouldn't that be enough to know to move us?

Another World Water Day Gone

We see another World Water Day pass us by. The theme, Water For All, signifies that though some progress has been made we are woefully behin...