Current sedimentation accrual rates in Te Awarua-o-Porirua Harbour remain elevated, particularly in the subtidal zones of Pāuatahanui Inlet. The highest rates are commonly associated with high mud contents (>25% mud) and poor sediment oxygenation (<10mm). Adverse ecological effects, e.g., loss of sensitive species, are likely to occur at these levels. Under the current situation, the management goals for Te Awarua-o-Porirua Harbour are unlikely to be met.

Reference: Stevens LM, Rabel H. 2024. Te Awarua-o-Porirua Harbour Sediment Plate Monitoring 2023/2024. Report GW/KI-G-24-12 prepared for Greater Wellington Regional Council by Salt Ecology, July 2024. 22p.