Watercare Marine Monitoring

 

CLIENT: Watercare Services Ltd.

DATE: 1995 - ongoing

 

Watercare Services Ltd. is New Zealand's largest bulk water supplier and Regional wastewater treatment provider.

 

Between 1998 and 2005, Watercare carried out the biggest environmental restoration programme to be undertaken in New Zealand. The upgrade of the Mangere wastewater treatment plant involved:

• an intensive public consultation and consenting process
• constructing a land-based plant that uses world-leading treatment technology
• removing 500 hectares of oxidation ponds and restoring 13 kilometres of coastline.

 

At $450 million, the upgrade represented Auckland’s largest infrastructure investment in a generation. The upgrade had progressively transformed the old plant into a totally new-generation facility, while providing an uninterrupted wastewater treatment service.  The upgraded treatment technology delivered a 10,000-fold reduction in pathogens in the treated wastewater discharged into the harbour.  This allowed for the 500 hectares of oxidation ponds to be returned to the Manukau Harbour, as well as the restoration of 13 kilometres of shoreline.

 

Between 1995 and 2011, Bioresearches coordinated and conducted a monitoring programme (HEMP, Harbour Environment Monitoring Programme) to quantify environmental effects of the discharge of treated wastewater and the environmental improvements gained by the treatment plant upgrade. The monitoring included harbour water quality, harbour sediment quality, shellfish quality, benthic biota abundance and diversity, macroalgae distribution and abundance.

 

Between 2001 and 2003, Bioresearches coordinated and conducted two monitoring programmes to record the effects of the breaching of the sea walls of the two sets of oxidation ponds.  The monitoring included pond and harbour sediment quality and distribution, distribution and abundance of harbour benthic biota, shellfish quality and  harbour water quality.

 

Between 2002 to current, Bioresearches has coordinated and conducted a monitoring programme (PRMP, Pond Recover Monitoring Programme) to track and document the changes in the oxidation pond environments returned to the Manukau Harbour.  The monitoring includes sediment and shellfish quality, benthic biota abundance and diversity, macroalgae distribution and abundance.

 

We worked with:

Watercare Laboratory Services

HortResearch

Woods