Newport is located within the Northern Beaches Council Local Government Area (LGA) approximately 30 kilometers north of the Sydney central business district. Newport is bound by the Pacific Ocean to the east, the Pittwater Estuary to the west, the Bilgola Plateau to the north and Mona Vale to the south. The catchment predominantly comprises residential properties with commercial properties adjoining Barrenjoey Road within the lower, eastern sections of the area. The steeper sections of the catchment are characterised by less intense residential development including extensive tree coverage. McMahons Creek drains the north-east portion of Newport with the remainder of the catchments draining to the Pittwater Estuary or Pacific Ocean via several unnamed watercourses. The urbanised sections of the catchment are also drained by a stormwater system which carries runoff into the main drainage culverts and watercourses. During periods of heavy rainfall across Newport, there is potential for the capacity of the stormwater system to be exceeded. In such circumstances, the excess water travels overland, potentially leading to inundation of roadways and properties. There is also potential for water to overtop the banks of the various watercourses and inundate the adjoining floodplain. Flooding across Newport has been experienced on a number of occasions. This includes above floor inundation of a number of properties in March 1977, October 1987 and May 1988. More recently, significant floods occurred in February 2012, November 2015 and June 2016. This report forms the Flood Study for Newport. It documents flood behaviour across the catchment for a range of historic and design floods. This includes information on flood discharges, levels, depths and flow velocities. It also provides estimates of the variation in flood hazard and hydraulic categories across the catchment and provides an assessment of the potential impacts of climate change on existing flood behaviour.