Rivers & Flooding – Flashcards
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A stream channel is of constant width and depth, how must increased discharge be accommodated?
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Increase velocity
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The bed load is the dominant portion of the total load for most rivers
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False
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Describe a '100-year' flood
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a flood that has a 1 in 100 probability (1% chance) of occurring each year
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Why is flood hazard mapping considered an important step in floodplain management?
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flood hazard mapping guides appropriate development in the floodplain
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Statistical probability of a flood of a certain magnitude occurring in any given year is referred to as
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the flood recurrence interval
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Urbanization affect on runoff and flooding
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runoff increases and the time between the precipitation event and water rise in local streams decreases
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Point bars vs. Cut banks
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Cut banks- sites of erosion Point Bars- sides of deposition
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Suspended load of most rivers consists mainly of
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silt and clay
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Type of flood is typically caused by intense rainfall of short duration
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upstream flood
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Runoff
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portion of rainfall that flows off the land and directly into the river
