What Is Spring Flooding? Spring flooding occurs when seasonal snowmelt, rainfall and changing ground and river conditions cause water levels to rise and inundate normally dry land. It is one of the most important seasonal flood hazards in many parts of Canada. During winter, large amounts of water can remain
What Is River Flooding? River flooding occurs when water levels in a river or stream rise high enough to overflow the normal channel and spread onto surrounding land. Flooding can develop gradually over several days or more rapidly when large amounts of water enter a watershed within a short period.
What Is Flash Flooding? Flash flooding is rapidly developing flooding that occurs when water levels rise quickly over a short period. It can develop when intense rainfall produces more water than the ground, waterways or drainage systems can handle. Unlike slower forms of flooding that may develop over several days,
What Is Torrential Rain? Torrential rain is extremely intense rainfall that produces a large amount of precipitation over a relatively short period. It is commonly associated with thunderstorms and other moisture-rich weather systems capable of producing very high rainfall rates. Unlike prolonged heavy rainfall, which can accumulate gradually over many
What Is Heavy Rainfall? Heavy rainfall occurs when a large amount of rain falls within a relatively short period or when persistent rain produces substantial accumulations over a longer period. In Canada, heavy rainfall can occur during thunderstorms, slow-moving weather systems, tropical systems and prolonged periods of moisture moving into