The non-impact of debris blockages on the August 1998 Wollongong flooding.

As part of the revision of Australian Rainfall and Runoff, Working Party 11 - Debris Blockage of Waterways is determining how flood-mobilised debris might best be accounted for in the design of the waterway openings of hydraulic structures. The claim of much data on debris blockage of drainage structures in the 1998 Wollongong flooding has been examined, and the finding is that none of that event's data quantifies the degree of hydraulic blockage of waterways by debris. [ABSTRACT FROM AUTHOR]