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

Type of Event
(Grouped)
% Occurrence of Type of Grouped Event
by Season
Winter Spring Summer Fall
% Occurrence of
Flood Events by
Type of Event Group
Rainfall 28% 21% 29% 22% 58%
Coastal 68% 0% 11% 21% 18%
Other 5% 5% 5% 86% 17%
Ice Jam 85% 12% 0% 3% 5%
Snowmelt 77% 8% 0% 15% 2%
2.3.5 Flooded Communities
Table 2-4. Event Type Occurrence
Table 2-5 details flood events by community. St. John‟s has had the most reported floods in the
province with 73 floods, or about 11% of the documented flood events in the inventory.
Stephenville, Corner Brook and Deer Lake have all reported multiple flood events in the
Western Region. There has only been one reported flood event in Labrador. Those communities
with a single flood event (202 presently in the inventory) are grouped into the “Other” section.
Figure 2-11 illustrates the seasonality of flood events in communities which have experienced
more than 10 flood events as documented in the inventory. As illustrated, these communities
have a general expectation of winter flooding, with the exception of Deer Lake where more
floods have occurred in the summer season.
Figure 2-12 illustrates the types of flood events that are experienced by these communities.
Again, flood producing rainfall events are most commonly experienced in these communities,
with the exception of Placentia which has experience more flood events as a result of coastal
phenomena. Table 2-6 outlines the type of event groupings referenced in Figure 2-12.
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