AUSTRALIAN GUIDELINES ON DESIGN FLOODS FOR DAMS.

The Australian National Committee on Large Dams (ANCOLD) has recently produced guidelines as a basis for reasonable, consistent practice, but with scope for engineering judgement. The need for them was identified from a survey of flood practices which showed wide variations between the various authorities in Australia. The guidelines include a concept of incremental flood hazard category with relevant recommended design floods, and a procedure for review of the adequacy of existing dam spillways with provision for economic risk analysis to determine the extent of upgrading.