ERTH 2415 Lecture 20: Lecture 20 and 21
16 Feb 2017
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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. The flood of 1997 inundated in more than 2000 km square up to 40 km wide. Unique characteristics of canadian floods flood is a flow and not a lake, rise and fall is slow ( many weeks ), generally causes inundation damage not damage by erosion. 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. The july 1996 floods in the saguenay valley, quebec. Highlight impacts of flooding along 4 area rivers: chicoutimi and sables rivers small dams, mars river plan form transformation, ha ha river dam breach. Inadequate spilling capacity at the dams: flood water exceeded the maximum operating capacity of all 7 dams.
