WHILE the Atlantic coast of America was preparing for last month’s massive snowstorm, California was enjoying a welcome, albeit temporary, reprieve from its four-year drought. The prolonged downpour—a harbinger of the imminent El Niño storms—raised pool levels in Los Angeles by almost three inches, providing your correspondent with an extra 500 gallons of water free of the city’s Tier 1 tariff. Lawns, parks and hillsides that had been left to go brown during the drought (state-wide emergency measures have required cities to cut water usage by 25%) have turned green again. The one dismay has been seeing millions of gallons of precious rainwater pour down hillside gutters and storm drains, as it flowed unhindered into Santa Monica Bay.
Vacations spent as a youngster in coastal towns around the Mediterranean (California’s climatic cousin) conjure memories of concrete-covered catchment areas with networks of gullies for feeding rain from the occasional cloud burst to underground cisterns. Every town, even the smallest, seemed to have at least one such water-storage system. By all accounts, little runoff escaped to the...Continue reading
Source: Science and technology http://ift.tt/23SCDJJ
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