Two roads were closed on Thursday as a result of storm damage.
Arun District Council has confirmed that Fish Lane and Aldwick Avenue in Aldwick, near Bognor, have flooded after the rain on Wednesday night.
West Sussex County Council closed the roads yesterday and they remain closed at this time.
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According to the council, Southern Water has assessed the situation and thinks the flooding is due to a blocked outfall.
A spokesman for Arun District Council said on Thursday: "We are aware of flooding at Fish Lane and Aldwick Avenue in Aldwick following the storm last night.
"The road has been closed by West Sussex County Council as it is impassable.
"Southern Water has assessed the site and suggests that the flooding is due to a blocked outfall.
"The responsibility for the outfall is under investigation at present.
"However, we know that it is important to resolve the issue and we have a representative on site.
Southern Water is awaiting a contractor who will assess the outfall and clear the shingle if it is safe to do so. Because this is in the intertidal zone, it makes clearance more complex.
"It is unclear if the blocked outfall is the only cause of the flooding. Once the outfall has been cleared, further assessment will be made.
"We are working hard to help as much as possible and will provide further updates when they are available."
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