Inundation - Freshwater

Flooded rivers are the most common cause of inundation [1]. Flooding in urban areas can also occur when drainage systems are overwhelmed.

Where the flooded river or drainage system is situated in a relatively flat area, the water is usually very slow moving and is therefore categorized as ‘still water’.

While this sort of flooding is mainly freshwater from rivers and excess rain, it will generally contain pollutants, such as sewage, heavy metals and chemicals. This is because the water will have traveled over land areas that are not usually covered by water or be affected by compromised drainage and sewerage systems.



What is the difference between this rating and supplier ratings?

The rating you see at the top of the page is the resilience rating of the generic class of building material to a particular hazard. A supplier rating is particular to a specific supplier product. For example, clay bricks may have a resilience rating of '3' to inundation but a supplier may have made specific improvements to their bricks and may be able to achieve a resilience rating of '5' for their clay brick. "