April 2024
This project aimed to assess the impacts and implications of meeting contaminant reduction targets for estuaries on catchment land-use and management. The objectives were to:
The project found the adoption of feasible mitigation options in combination with targeted moderate land-use change will be able to sustain a significantly improved ecological health of New Zealand estuaries and rivers. Increased effort implementing sediment mitigation measures is required to keep up with climate-driven exacerbation of sediment generation, especially in soft-rock hill country.
For estuaries susceptible to eutrophication or whose catchments exceed NPS-FM bottom lines for one or more contaminants, implementing P and sediment mitigation measures alongside N mitigation measures targeting a 60% N reduction could sustain a considerably improved ecological health of estuaries and rivers.
Manaaki Whenua – Landcare Research Contract Report LC4436