There were long queues on the A27 at Lancing in Sussex today, with the dual carriageway reduced to one lane eastbound. Homes in nearby Manor Way were abandoned. Many gardens have been under several inches of water over the Christmas period.
Emergency pumping work has been going on to try to tackle what residents say is an ongoing problem.
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Tuesday's weather for the west of the region
Tuesday's weather for the east of the region
Causes are thought to be climate change, fisheries, disease, and pollution.