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Audio, Radio New Zealand

For many years the Heathcote-Avon estuary was the dumping ground for Christchurch's sewage. Then, in 2010, the wastewater was diverted well out to sea, via a long pipe. David Schiel from the University of Canterbury and John Zeldis from NIWA were investigating the effects of this diversion on the health of estuary when the 2011 Christchurch earthquakes happened, re-engineering both the estuary and their experiments.

Images, UC QuakeStudies

A photograph captioned by BeckerFraserPhotos, "What a view from Nicholson Park on Scarborough. People enjoying Sumner Beach with South Brighton spit across the estuary entrance, the estuary at low tide and behind, the settling ponds and the city with its abundance of trees. Snow covered Southern Alps as a backdrop. Pity about the smoke haze this afternoon".