Milwaukee is spending $100 million on a metropolitan flood-control project, hoping to avoid future flood damages that have cost that much since 1997. The centerpiece of the plan is a 17-ft-diameter, half-mile-long tunnel that will drain up to 3,405 cu ft per second of water from a flood-prone creek into a 315-million-gallon detention basin. Slide Show Photo: Mike Larson Tunnel diameter is more than 17 ft, designed to quickly channel stormwater to detention basin. When heavy rain causes nearby Underwood Creek to overflow, the new tunnel will drain the excess water to a 65-acre engineered detention basin that will slowly
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.