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chapter12_post - Extra notes from Ch 11 A river can have...

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Extra notes from Ch. 11 • A river can have high erosive or high depositional power. Not both at the same time. Relationship to sediment load: •If sediment load in the river is high, it has high depositional power. •If sediment load in the river is low, it has high erosional power Relationship to velocity (and therefore discharge) •If velocity is high, erosive power is high •When sediment load or discharge is changed, a river will change its pattern or gradient to maintain a natural balance of erosion and deposition.
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Ch. 12-- Floods and Human Interactions Development Effects on Floodplains Urbanization Deforestation from fires, logging, overgrazing Mining Bridges Levees and their effects on flooding Flooding from dam failure Reducing flood damage
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