Lake Managua only in 2009 that a modern wastewater treatment plant (built and operated by the British company Biwater) was opened in Managua, but even it treats only 40% of the city's wastewater. The lake today has no stable outlet, with only occasional floods to Lake Nicaragua through the Tipitapa River. Pollutants are thus concentrated. Despite the pollution, some of the people of Managua still live along the lake's shores and eat the fish. In 2007 the "malecón" area was dredged and the sediment hauled off on barges. A strong odor which permeated the area from the sediment disappeared. A stone rip-rap
Managua and its economy. To make matters worse, a series of natural disasters, including Hurricane Mitch in 1998, made economic recovery more difficult. After winning the presidential election in 1990, the National Opposition Union began the reconstruction of Managua began in earnest. More than 300,000 Nicaraguans returned from abroad bringing their expertise and needed capital. Businesses mushroomed, new housing projects and schools were constructed, the airport was expanded and modernized, streets were widened, older malls were repaired and new ones were built, and buildings were cleaned up. In 2006, after the Sandinista National Liberation Front came back into power, literacy, health