![]() ![]() ![]() Impacts can include shortened beaches, inundation of low-lying areas adjacent to the lake, and erosion to trails. The greatest risk of shoreline flooding and erosion occurs when elevated water levels are coupled with wave action from high winds. Shoreline erosion occurs when the movement of water removes natural or man-made materials along the shoreline. Great Lakes water levels also fluctuate between multi-year periods of higher and lower water levels according to natural processes.Įlevated levels can cause flooding, and the combination of high water levels and wave action also leads to shoreline erosion. Lake Ontario water levels seasonally rise in the spring and early summer. Lake Ontario Water Levels: Risks and Impacts This prolonged and heavy precipitation, on top of already saturated soils, can cause rivers to rise. LEARN MORE.įALL – Seasonal Weather Systems: Large wet weather systems, including tropical storms such as hurricane remnants (like Hurricane Hazel), can last for several days. These intense, localized downpours can lead to flash flooding. ![]() SUMMER – Thunderstorms: Thunderstorms can bring large amounts of rain in a short period of time. When temperatures rise, snow melts and turns to runoff. SPRING – Spring Thaw: Accumulation of snow during the winter season can lead to flooding during the early spring if conditions are right. Rivers can become backed up and can overflow their banks. These pieces of ice can become jammed at bridges or other obstructions. WINTER – Ice Jams: When temperatures and/or water levels rise, river ice breaks into pieces. Watersheds with these characteristics are called “flashy”.ĭid you know there are several types of flooding? LEARN MORE. Runoff is conveyed quickly to the receiving watercourse through a number of drainage systems, causing water levels in streams and rivers to rise quickly. These transactions are highly dependent on land use cover, surface elevation, and human-made water systems.įactors that contribute to flooding within TRCA’s jurisdiction include the amount of surface runoff, the characteristics of the watershed (percentage of impervious surface, soil type, slope, etc), and historic land use practices.ĭue to the urbanized nature of the GTA, the majority of rainfall becomes surface runoff. However, flooding generally is caused by precipitation, surface runoff and infiltration amounts. There are many processes within the natural water cycle, such as evaporation and groundwater flow. Surface flow rapidly travels overland and through storm sewers, reaching watercourses and causing water levels within the rivers to rise quickly. When rain falls, or when snow melts, the water either infiltrates the soil or becomes surface flow (also known as runoff). Flooding also takes place along lake and coastal shorelines, when higher than normal water levels inundate low-lying areas. Most flooding occurs when the volume of water in a river or stream exceeds the capacity of the channel. Toronto and Region Conservation Authority (TRCA) Flood Risk Management plays a key role in providing municipalities with the information they need to respond to flooding. Contact: Infrastructure Planning and PermitsĬlimate change has increased the likelihood of more severe and frequent storms, which in turn raises the risk of flooding.Contact: Development Planning and Permits.Coordination with Other Approval Agencies.Procedural Manual & Technical Guidelines.Pre-consultation and Complete Application Requirements.Planning and Permits Information: Checklist/Quick Links.image/svg+xml parks-rec parks-rec Places to Visit & Things to Do. ![]()
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