San Antonio: Solution
Experts consider San Antonio's anti-flood approach among the most innovative
solutions to flooding in any metropolitan area. Between 1987 and 1996, federal
and local governments funded the construction of a 16,200-foot concrete
flood-diversion tunnel beneath the city. It siphons rainfall out of populated
areas and carries it to the San Antonio River. Fully 24 feet in diameter, the
tunnel was dug with a massive tunnel-boring machine, seen here in action
beneath San Antonio.
