Excess water at Kowhai Park has now fully drained away but Wanganui District Council workers say it could take months to complete the clean-up.
Half a metre of thick silt and mud still cover many of the park's attractions, and there are two diggers working to remove it.
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Council senior parks officer Wendy Bainbridge said it was very difficult to estimate a timeline for the opening of the playground. "This is not an easy operation, and the clean-up is more likely to be measured in months, not weeks.