The Eden, Twofold Bay and Towamba River Flood Study has been prepared for Bega Valley Shire Council to define the existing flood behaviour in the catchment and establish the basis for subsequent floodplain management activities. The study area covers the entire catchment of Twofold Bay with a focus on understanding the flood behaviour and risk in the foreshore locations of Eden, Lake Curalo, Quarantine Bay, Boydtown and Munganno Point / Jews Head and the catchment localities of Rocky Hall, Wyndham, New Buildings, Burragate and Towamba. The Twofold Bay catchment is located in the Bega Valley Shire Local Government Area, which is approximately 400 km south of Sydney and 600 km north east of Melbourne along the Princes Highway and approximately 230 km south east of Canberra along the Snowy Mountains Highway on the NSW South Coast.

The overall objective of this study is to improve understanding of flood behaviour and impacts, and better inform management of flood risk in the study area through consideration of the available information, and relevant standards and guidelines. The study will also provide a sound technical basis for any further flood risk management investigations in the area. This project is a flood study, which is a comprehensive technical investigation of flood behaviour that provides the main technical foundation for the development of a robust floodplain risk management plan. It aims to provide a better understanding of the full range of flood behaviour and consequences. It involves consideration of the local flood history, available collected flood data, and the development of hydrologic and hydraulic models that are calibrated and verified, where possible, against historic flood events and extended, where appropriate, to determine the full range of flood behaviour. The project provides an understanding of, and information on, flood behaviour and associated risk to inform:

• relevant government information systems;
• government and strategic decision makers on flood risk;
• the community and key stakeholders on flood risk;
• flood risk management planning for existing and future development; and
• emergency management planning for existing and future development, and strategic and development scale land-use planning to manage growth in flood risk.