The pumps can move the equivalent of an Olympic swimming pool's worth of water in less than two minutes.
A £16m water pumping station has opened in an area of Hull badly hit by flooding almost a decade ago.
Six 92ft (28m) long Archimedes screw pumps have been installed at the Bransholme pumping station, which failed during major flooding in 2007.
During heavy rainfall the pumps move surface water from the sewage system into an adjacent storage tank.
Yorkshire Water said the new development would protect more than 15,000 properties.
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The pumps can transfer the equivalent of an Olympic swimming pool of storm water into the lagoon in less than two minutes.
The stored water is then slowly released into the River Hull.
Yorkshire Water's Nevil Muncaster thanked local residents for their support during the two-year building work.
He said: "It has been a significant engineering challenge and we recognise that this has sometimes had an impact on local people and we are very grateful for their understanding."
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