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Barrage Balloon1st August 1918: A barrage balloon tethered at Queens Club, London, in the background the tents used for housing the balloons. (Photo by A. R. Coster/Topical Press Agency/Getty Images)
Clanwilliam Dam on the Olifants River with open flood gates, Clanwilliam, Western Cape, South Africa, Africa
Digital illustration of navy ship using surface-launched charges as anti-submarine weapons causing barrage of concussive blasts underwater
Gravity dam damming the Aare River at Raeterichsbodensee Lake, Guttannen, Bernese Oberland, Switzerland, Europe
At Lac de Louvie mountain lake, Val de Bagnes valley, Canton of Valais, Switzerland
Glen Canyon Dam, reservoir, Lake Powell, Page, Arizona, USA
Dam on the the Waitaki River, Kurow, Otago Region, New Zealand
Aerial view, Susqueda Reservoir, Panta de Susqueda, Catalonia, Spain
Aerial view, river Ter, Riu Ter, Susqueda Reservoir, Panta de Susqueda, Catalonia, Spain