Southeastern Manukau / Pahurehure Inlet contaminant study: hydrodynamic, wave and sediment-transport model. Implementation and calibration

Mark Pritchard, Richard Gorman, Matt Lewis, National Institute of Water and Atmospheric Research Ltd NIWA
Auckland Regional Council
Publication date:

Empirical data and modelling simulations indicate that stormwater contaminants are rapidly accumulating in the Southeastern Manukau Harbour and Pahurehure Inlet. Stormwater contaminants, which include zinc and copper, are discharged to the Pahurehure Inlet with runoff derived from mainly urban and industrial catchments. This problem, induced by surrounding urbanisation and industrialisation may be further compounded by ongoing and future developments in the surrounding areas. To date there is no clear understanding of the fate of contaminants exported from numerous creeks and side-branches into the main body of the inlet and harbour, or that of contaminants discharged directly into the harbour. The main aim of the Southeastern Manukau Harbour / Pahurehure Inlet Contaminant Study is to model contaminant (zinc, copper) and sediment accumulation for the purposes of, amongst other things, identifying significant contaminant sources, and testing efficacy of stormwater treatment options.

Prepared by the National Institute of Water and Atmospheric Research Ltd, NIWA for Auckland Regional Council.

Auckland Regional Council technical report TR2008/056

Last updated: 2018-09-26