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Gray water's grass roots

In a grass-roots effort, a Los Angeles community pushes the plant-saving practice of reusing water from showers, baths, sinks, and washers.

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Landscape architect Robin Grabs of San Pedro, Calif., has come because two clients requested gray-water systems. It's fascinating, she says, but the amount of information is overwhelming.

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Allen understands this reaction. "Fitting all the important things that gray water brings into a five-day class and a manageable package is a challenge," she says. The course has to cover plant and soil information, plumbing, and landscaping and design skills. It's aimed at a wide range of users – from those who must work within small budgets to those with larger ambitions, as well as people who simply want to water the plants in their yard inexpensively and those who might have a large commercial landscape.

Legalization boosts demand

In the months since California changed the gray-water permit requirements, demand has begun to build statewide, says John Leys of Sherwood Design Engineers in San Francisco, which has clients across the United States as well as abroad.

Mr. Leys recently consulted on new ­water-planning regulations for Abu Dhabi, capital of the United Arab Emirates, which has water needs similar to those in the American Southwest.

'Ten years ago, we were not seeing any demand for gray-water systems," he says, but now clients of all types are requesting projects that range from simple and inexpensive backyard irrigation retrofits to complex, multipurpose gray-water systems that are part of the design from the beginning.

Leys notes that as pressures over drought regulations and energy conservation have started to build, many businesses have begun to see that reclamation and reuse make sense from both a business and an environmental standpoint.

For instance, if a development of 10,000 new homes reduces its overall potable water use by as much as 25 percent, he says, that means a huge savings in construction and utility costs.

Most of the momentum toward greater use of gray-water systems is not being driven by economics – yet. "But that is inevitable," Leys says, "if you consider that despite the vast oceans covering the planet, less than 1 percent of the world's water is both fresh and accessible for human use."

He believes that it's important to plan for solutions in advance of a water crisis, and that when and how that's done will become critical.

Today, even with conventional water-supply strategies and technologies, water shortages are common in communities around the globe. The World Health Organization reports that more than 2 billion people – roughly 1 out of every 3 people on the planet – live in a water-stressed area.

Commenting on the importance of reclaiming and reusing water, Leys says: "History demonstrates that properly managed water resources can be the deciding factor in determining the habitability of an individual site, the sustainability of a community, or the survival of an entire civilization."

[Editor's note: The original cutline of the first photograph misstated the type of system being installed and for whom.]

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