Possible cause of Moa Point sewage spill revealed

What this episode covers

Air trapped in a pipe could have contributed to the massive blow back of sewage that flooded the Moa Point treatment plant. Modelling in an initial report suggests during high water flow turbulence traps air in the bypass pipeline. That air acts as a block reducing waste flows. Pressure from trapped air could have forced sewage backwards up the pipe flooding the treatment plant. Wellington Water's chief operating officer Charles Barker spoke to Lisa Owen.

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How long is this episode of Checkpoint?

This episode is 6 minutes long.

When was this Checkpoint episode published?

This episode was published on March 20, 2026.

What is this episode about?

Air trapped in a pipe could have contributed to the massive blow back of sewage that flooded the Moa Point treatment plant. Modelling in an initial report suggests during high water flow turbulence traps air in the bypass pipeline. That air acts as...

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