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The extent of flooding in South Dunedin was evident from above on Thursday, the day after a 1-in-100-year rain event.
Dunedin City Council water and waste services asset and commercial manager Tom Osborn said the flooding was the result of a stormwater system that was ''absolutely chock-a-block and couldn't accept any more flows into it''.
''Water that would normally have gone down the mud tanks and into the stormwater system couldn't drain away.
''It just couldn't get down the plug hole quick enough, essentially.''
Once the rain stopped, the levels inside the sewers had dropped, allowing more in and water on the surface to drain away, Mr Osborn said.