A flood occurs when an shoreline area is submerged because the volume of the body of water has surpassed the capacity of its bed. Major floods usually happen when snow melts in the springtime, during periods of heavy rain, but also in wintertime when frazil accumulates (see Types of Floods). A quick and major increase of the water level can also occur when a dam breaks.


Senneville is a municipality nestled by the Lac des Deux-Montagnes. As such, floods and Frazil Ice are one of the main natural hazards occurring on the territory.  

During the year, flood forecasters monitor the amount of rainfall and snow and the impact on levels on rivers, lakes, creeks and streams.




Water flood surveillance

Due to risk of flooding, several bodies of water are subject to continuous monitoring.

A body of water is flooded when its last measurement is above its minimum flood threshold (SIM). Click below to view the chart or hydrograph.

 Reference: Ministère de la Sécurité publique



Flood sectors

Here are some maps of the 2017 floods, however they do not have the legal value of the provincial flood ratings.

Flood sectors

Phone Numbers & Contact Information


Emergency in public security 24/7

Emergency services in public security are available all year round, 24 hours a day, 7 days a week.

Emergency situation - Hydro-Quebec

Road Information: 511 (www.quebec511.info



Health ​r​​​​isk

Floods can occur when a body of water overflows, during high tides or after heavy rains. The consequences of a flood or heavy water damage at home could have adverse effects on the health of the occupants. The Centre intégré de santé et de services sociaux (CISSS) de l'ouest-de-l'ile-de-Montréal can give you information if you are worried about your family's health or your own, with regard to mould, unsanitary conditions, etc. In case of doubt, you can phone 811.​

Health problems caused by molds

Returning home



Video : Spring Flooding

This video explains how Hydro-Québec’s different types of facilities help reduce spring flooding. It also shows the work we do and the tools we use to predict and help limit flooding.