Home to more than 4 million people, Los Angeles has long relied on imported sources to meet most of its vast water needs. However, these imported water supplies are not expected to be able to keep pace with the city's growing demand in the future, especially in times of prolonged drought. Meanwhile, because of climatic conditions, Los Angeles has long been prone to flooding. In response, the city has developed an extensive drainage network to route flows to the Pacific Ocean rapidly and efficiently during storms. Although highly effective as a means of flood control, this drainage conveys storm water into the city's receiving waters, which exacts a toll on water quality. For these reasons, Los Angeles is attempting to reduce its reliance on imported water supplies while decreasing its discharge of polluted storm-water runoff. Known as the Green-Blue City of Los Angeles One Water Management Program, the ambitious effort is changing the way that the city approaches the issue of water. In the past, potable water, wastewater, and storm water were each viewed as separate quantities to be addressed in compartmentalized fashion. By contrast, Los Angeles now views the various sectors as "one water." As a result, the city has begun planning and implementing a wide-ranging, innovative series of initiatives that aim to derive the highest possible value from its existing water sources.
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