Audie Cornish talks to David Ulin, a The Los Angeles Times book critic who wrote an essay for Boom magazine on a famous William Mulholland speech about the 100-year-old engineering marvel that is the Los Angeles Aqueduct. The aqueduct brought water from the Owens Valley hundreds of miles away to a growing area in need of additional resources to sustain its people and their endeavors, helping spur an economy that today rivals that of many nations. A century later, this gravity-fed system continues to be a major source of water for Angelenos, supplying about half of the water needs for four million people on an average year.
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