This Flood Study has been prepared by WMAwater (formally Webb, McKeown & Associates) on behalf of Sutherland Shire Council (Council). The main objective of this study is to define the flood behaviour in the Woolooware Bay catchment (the catchment) under existing conditions.

This study has examined past flood events in addition to undertaking a flood assessment for a range of design storms. The findings in this report provide information to inform Council with regards to managing existing and future flood risk within the catchment.

The information and results obtained from this Flood Study will define existing flood behaviour and provide a firm basis for the development of a subsequent Floodplain Risk Management Study and Plan. A variety of flood mechanisms including mainstream flooding, local overland flow flooding and tidal inundation were considered.

In addition to defining the flood behaviour (5 year, 10 year, 20 year, 50 year, 100 year, 200 year ARI events and the Probable Maximum Flood (PMF)) in the Woolooware Bay catchment, the study was developed to:

*Define flood behaviour in terms of flood levels, depths, velocities, flows and flood extents within the study area;

*Provide provisional flood hazard and flood extent mapping (for all design events modelled); and

*Consider the potential effects of a climate change induced increase in design rainfall intensities and sea level rise in accordance with the NSW Government Guidelines.