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Rivers & Flooding

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

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