The town of Coonamble on the Castlereagh River in New South Wales has a population of about 1200. It is protected from flooding by a ring levee with a total length of approximately 73cm. Included in the levee system are 2 reinforced concrete retaining walls located north and south of the Aberford Street bridge. Total length of the retaining walls is 1,710 metres.

The levee was originally constructed in 1975 to a design level as produced by a combination of the 1955 flood in Warrena Creek and the 1974 flood on the Castlereagh river, plus 0.6m free board.

The audit is designed to appraise the flood security and structural adequacy of the levee system at Coonamble. This report presents the results of that audit and consists of a visual appraisal of the levee and materials, assessment of the water retention capacity of the levee, research of flood records and an appraisal of the cost of corrective action and the extent of such action.