Aug 17, 2010

Collecting the Fog to generate useable water supply for irrigation

 An interesting article from Greensource.construction.com follows

Oman plans to generate thousands of liters of water a day thanks to a budding technology that collects and stores fog droplets.
In the second year of a five-year “fog collection project,” Omani officials, in collaboration with Japan’s Mitsubishi Corp., have placed large nets made of plastic mesh at about 700 meter above sea level in the Al Qara mountains near Salalah, in the southern part of the nation.

The collector is comprised of four 20-m-wide, 3-m-tall nets at opposite ends of a reservoir capable of holding 400 cu m of water. As fog from the summer monsoon, or “khareef,” rolls in, droplets are captured on the mesh. They will drip down into the reservoir to be stored and used as needed.

Mitsubishi is donating materials and technical expertise valued at about $370,000 to the project, as part of its corporate sustainability program.
The water will irrigate plantings to reverse four decades of desertification in parts of Salalah. Collected droplets can also be used as drinking water for animals. By the project’s end in 2013, organizers hope to have created a 4-km-long greenbelt of about 1,000 trees.

Mitsubishi spent the first half of 2009 constructing and erecting the mesh nets and building the reservoir in time for last year’s monsoon. But a weaker-than-expected khareef last year produced only about 200 cu m of water. “This year, the monsoon is already stronger, so we expect 400 cubic meters,” says Tomoo Shoji, Mitsubishi’s environmental specialist for the project.

Even with weak rainfall, the group was able to irrigate new plantings of 250 indigenous trees on what had been barren landscape. The greenbelt is fenced off to keep animals from grazing on the plants.
The fog collection project is the first for the largely arid Arabian peninsula. Oman faces the Arabian Sea and benefits from the annual monsoons that wash over the Indian subcontinent. Salalah is especially lush, with fog rolling in over the mountains before evaporating inland in the Rub al Khali desert.

Robert Schemenauer, executive director of Fogquest, says fog collection programs are a reliable source of water because large-scale weather patterns don’t normally change for thousands of years. The Canadian nonprofit, based in Kamloops, B.C., plans and implements fog collection projects in rural communities of developing countries.
“Once you set up a project like this you can expect the water to come, basically forever,” Schemenauer says.

Supporters of the Oman project hope for a similar outcome. “Once the trees have grown, they themselves will function as ‘live mist catchers’ to produce water for the area,” Shoji says.

Water-Starved Oman Collects Monsoon Fog

August 16, 2010

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