A Reality Check on Flood Risk

Traditional approaches to flood risk assessments involve modelling catchment systems to determine predicted flood plains and using these to assess flood risks for property and infrastructure. While this is a necessary first step in determining flood risk it is far from adequate.

This paper considers the wide ranging physical dynamics that come into play during actual flood events. This paper provides a reality check on what actually happens during extreme flood events and advocates for more consideration of potential blockage, obstructions, changes to waterways during flood events and impacts on water level associated with velocity and momentum.

Consideration of these factors may lead to improved prediction of flood hazards, more effective flood mitigation measures and better preparedness for emergency management and response.