River mouth water quality monitoring will assess change over time in concentrations and loads of the major land sourced pollutants that have the potential to adversely affect coral reef and seagrass ecosystems. This monitoring will provide the primary indicator of the delivery of pollutants to the waters of the Great Barrier Reef, and consequently of the effectiveness of measures aimed at reducing that delivery. Parameters measured will include nutrient species, suspended solids and pesticides. Monitoring will consist of a conventional grab sampling program, as well as the use of innovative water quality sampling techniques at the mouths of the major rivers flowing into the Great Barrier Reef World Heritage Area (e.g. Fitzroy, Burdekin, Herbert, and Johnstone Rivers). Sampling will occur during both the wet and dry seasons. Outcomes: Information about current status and long-term (10 year) trends in water quality and marine ecosystem status in the GBRWHA.