To Utilise Hydrological and Hydraulic Modelling to Support the Prediction of Fluvial Erosion Risk in Auckland

Jackie Zhou (Auckland Council), Scott Speed (Auckland Council)

Sediment is recognised as a key contaminant in the New Zealand freshwater environment due to the major impact it has on water clarity, ecosystem habitat and biodiversity loss. The National Policy Statement for Freshwater (NPSFM), Te Mana o te Wai, and the New Zealand Coastal Policy Statement (NZCPS) require sediment to be actively managed and the level improved or at least maintained. In the past, land-based activities were perceived as the main source of sediment in the streams, however, recent studies in New Zealand have shown that in many river and stream systems, the main source of sediment is from stream erosion processes.