Gravity means rain plus Gatineau hills is a bad combination for flooding
Ottawa Citizen

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By Tom Spears, Ottawa Citizen, November 2, 2017

Water flows downhill, and the Outaouais adds an exclamation mark to the truism.

Each heavy rainstorm seems to vent its greatest anger in West Quebec.

This week, washed out roads in Gatineau, Chelsea, and Denholm. Last May brought devastating floods.

And the rainstorm of St. Jean Baptiste Day 2011, washed out sections of Highways 148 and 105, along with countless smaller roads and the Wakefield Steam Train tracks. It left Ontario mostly intact.

The difference is partly about hills, or the lack of them.

http://ottawacitizen.com/news/local-news/gravity-means-rain-plus-hills-is-a-bad-combination-for-flooding