The tidal barrier which will protect thousands of homes and businesses from the risk of flooding.
Work on the 38 million pound project in Ipswich started today and it is due to open in 2016.
The council says it will secure the future of the town, and encourage economic growth.
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The week long Norwich Science Festival kicked off over the weekend with experiments and displays for adults and children of all ages.
Rain spreading east this morning, drier and brighter later.
Some rain on Monday morning. Turning brighter through the afternoon.