Floodgate

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  Tokyo floodgates to protect from typhoon surges
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  A hinged crest gate during installation.
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  A floodwall gate at Harlan, Kentucky.
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  Tainter gates and spillway.
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  A roller gate on the Mississippi.
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  Discharge from a Howell-Bunger valve.
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  Clamshell gate
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  Drum gate diagram
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  Drum gates
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  Hinged crest gates at the Scrivener Dam, Canberra. (image at en)
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  Billwerder Bucht, Hamburg, Germany
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  Floodgate Amerongen, The Netherlands
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  Floodgate Amerongen, The Netherlands
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  Floodgate Amerongen, The Netherlands
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  Floodgate Amerongen, The Netherlands
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  Floodgate Amerongen, The Netherlands
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  Floodgate Amerongen, The Netherlands
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  Floodgate in Hungary
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  Floodgate in Ota Ward, Tokyo, Japan.