ERTH 2415 Lecture Notes - Lecture 20: Saguenay River, Ring Dike, Meander
19 Jun 2015
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Document Summary
Lecture 20, 21 red and saguenay river flood: red river meandering river, has low gradient ( 7cm per km ), occupies a shallow valley 15m deep. Net result is broad, shallow, slow moving floods: coping with the flood, emergency dyking sand bag dyke/ sand bag ring dyke, flood protection infrastructure building on pads, ring dyked towns. Inadequate spilling capacity at the dams: flood water exceeded the maximum operating capacity of all 7 dams. Collateral damage to nearby buildings even where these are situated above flood levels: mars river study area : Flood changed the channel pattern from meandering to braided: ha ha river flood : Most severe flooding in the region occurred along ha ha river. Flood accentuated due to dyke breach at lake ha ha. Ha ha river conclusion flood : flood accentuated by erosion of an earth fill dyke and incision of underlying cohesive glacial deposits. Estimates of flood discharge range between 900 and 1380 metre cube.
