ERTH 2415 Lecture Notes - Lecture 1: 1997 Red River Flood, Red River Floodway, Ring Dike
10 Oct 2016
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Document Summary
Fine silk and clay accumulate, bottom of red river valley is clay. For every km the rival travels it drops 7cm (shallow) Major flood in 1950 (evacuation of half of winnipeg, cost 800 million) Flood in 1979 (evacuation south of winnipeg) Flood of 1997 (big, termed the red flood the red sea) 1826 was the largest flood of all. Flood is flow and not a lake (not forming a lake) Rise and fall slowly (many weeks) floods take time, not flash floods. Generally cause inundation damage and not erosion damage to structures (leads to lots of mold growth) Red river flood recipe (required for large floods) Severe frost before snow ground (freezes the saturated ground) little water will penetrate the ground it will just run over it. Heavy snowfall during late part of winter (stores water) Above normal rainfall during melt period (generates more runoff) moisture in the air condenses on the snow and helps melt it quicker.
