How to manage the cumulative flood safety of catchment dams

Abstract

Dam safety is a significant issue being taken seriously worldwide. However, in Australia, although much attention is being devoted to the medium-to large-scale dams, minimal attention is being paid to the serious potential problems associated with smaller dams, particularly the potential cumulative safety threats they pose in catchments. This paper establishes the significance of this problem and reviews various Australian policies, including consideration of evidence from past research, to identify the potentially more effective policies with respect to smaller dams/cumulative safety assurance. New ‘case studies’ research that recently tested the effectiveness and coverage of the “strong” dam-safety policy of New South Wales (NSW) is then reported. The case studies comprised 2 samples of 10 hazardous private reservoirs investigated for spillway adequacy in line with state-of-the-art practice: one sample comprised dams supervised under the NSW policy, while the other sample comprised only non-supervised dams.

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