AC dam DC electric electrical embankment dam flood barrier local river barrier plant power power plant retaining dam station water water power architecture barrier defence defensive engineering England english flood gray Great Britain grey hood landmark London protection river steel thames tidal tide acdc concrete ecological green power wall afloat anniversary balloons barriers bay blue checking clouds construction cranes energy entertainment festival floating flood-lights height high lighting lights marina metal metallic metalwork night-programmes platforms preparation prepared preparing public ripples screen secure security Singapore sky sound steps strong structures tall temporary testing towering towers walkways
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