Flood Risk and Vulnerability Analysis Project - Atlantic Climate ...

2.3.4 Causes of Flooding
As noted previously, the data field describing the „Types of Events‟ is based on an interpretation
of information provided with the source data for the particular flood or storm event. At times the
source data for a flood event is not specific as to the primary initiating cause (i.e., rainfall, ice
jam, storm surge, etc.). Figure 2-10 details flood occurrence based on the information in the
„Types of Events‟ field. It is clear from Figure 2-10 that the primary causal event for flooding in
the province is rainfall with the secondary causal event related to coastal processes (e.g., storm
surge and waves).
Table 2-4 details the occurrence the flood event type grouped both on a seasonal basis and in
the context of all flood events in the inventory. Again, it is clear that rainfall events result in the
greatest number of flood events representing the causal event in 66% of the flood events in the
inventory. Also of interest is that flood events resulting from rainfall occur somewhat evenly over
the year. Flood events associated with coastal events occur most frequently in the fall and
winter. Together, flood events resulting from rainfall or coastal processes represent 87% of the
events documented in the inventory.
Figure 2-10. Flood Occurrence by 'Types of Events’
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