February 20, 2018

Flooding, Impact of Debris and Blockages


Often a flood event of minor or medium (but not extreme) rainfall results in flood level much higher than predicted by models. This is usually a result of either 1 of 2 things:

1. Higher than expected Tailwater Levels (Ocean or down stream river or Lake etc)

2. Blockage of a structure due to Debris (Culvert or Bridge)

The latter has been shown to be highly significant in a number of major flooding incidents.

The 1998 Event in Wollongong resulted in extensive damage, however was it not for the level of blockage due to debris, it is likely the flood level would have been considerably lower.

This has been the subject of ongoing monitoring and research and resulted in a conference paper. The paper is available for download here: IMPACT_of_Blockage

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