The metropolis, situated in a giant natural bowl, suffers flooding and backup with every rainy season.
The enormous expanse of concrete and asphalt known as Mexico City was once a lake. And each year, starting about this time, it seems hell-bent on becoming one again.
Since the days of the Aztecs, inhabitants have labored to manage the waters of the basin cradling modern-day Mexico City. Now they're trying again, with a much-touted, $1.3-billion government effort to revamp the massive but overwhelmed sewer system.