In summer 1858, when foul odors from the polluted River Thames forced the British Parliament to suspend its activities, legislators allocated funds to build London's first main sewers. A century and a half after the notorious Great Stink, the river is again under threat, this time from storm overflows. Thames Water TUNNEL TIME Thames geotechnical work platform rises from the river as Londons Big Ben loom onshore. Thames Water FOLLOWING THE RIVER The Tideway project comprises three proposed routes, all of which will feed the main tunnel. The River Lee tunnel, now under construction, will connect to the Abbey Mills
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.