In your first picture I see a flat river bottom valley between steep hills
Actually, that's a pic of what was once a lake. Sumas Lake was drained in 1920 to create farm land. Pic below is what it used to look like.
Ratty's global warming BS has nothing to do with these floods. Here's a bit of history from that region..
en.wikipedia.org
1894 Fraser River flood
The largest flood of British Columbia's Fraser River on record occurred in May 1894, when rapid snow melt caused river levels to rise dramatically, triggering flooding from Agassiz to Richmond. The flood was significant in both height and breadth. [21] In 2008, Northwest Hydraulic Consulatants (NHC) recommended the adoption of the following flood frequency estimates at the Hope gauge on the Fraser River: 100 year daily maximum flow 14,700 m3/s (520,000 cu ft/s); 200 year daily maximum flow 15,600 m3/s (550,000 cu ft/s); 500 year daily maximum flow 16,800 m3/s (590,000 cu ft/s). The Fraser's highest recorded flow, in June 1894, is estimated to have been 17,000 cubic metres per second (600,000 cu ft/s) or within a range of about16,000 to 18,000 cubic metres per second (570,000 to 640,000 cu ft/s) at Hope. [9] Based on these flows, the 1894 flood had a return period of slightly more than 500 years and the 1948 flood was close to a 200-year event ( NHC 2008, p. 21). [9] Of the two catastrophic floods on the Lower Fraser River since European settlement in the Fraser Valley, the flood of 1894 is considered to be the "flood of record", but the flood of 1948 caused greater damage because of "intensive development" on the flood plain( NHC 2008, p. 1). [9]
dailyhive.com
What is Sumas Lake? 100 years ago, Abbotsford had a 134 sq km lake (PHOTOS)
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