WaterCAST nutrient modelling of the Leschenault catchment

Nutrient modelling of the Leschenault catchment estimates that the Leschenault Estuary receives annual loads of 334 t of total nitrogen and 21 t of total phosphorus. These nutrient loads are substantial, and may lead to a decline in water quality within the estuary over a period of years. The nutrient inputs have the potential to cause regular problems with algal blooms, as seen in other Swan Coastal Plain estuaries, such as the Vasse–Wonnerup, Peel–Harvey and Swan–Canning systems.