The volume of water passing through a cross section of a stream in a unit of time. Its average discharge reflect size of streams' drainage basin and climate (area x avg. velocity)
When the volume of water in a stream exceed the volume of the channel
Rain that flows downslope as a thin film
What helps minimize flooding?
Levees, reservoirs, moving levees farther away from edge to creating floodways that revert into wetlands (absorb water)
Volume reduction best solution
Extra flow deepnds channel relative to its surroundings
Array of interconnecting streams
Drainage network collects water from broad region and feeds into trunk stream
Sloping sediment accumulates when stream comes from mountain and spreads out
Streams intertwine when choked with sediment
Follow snake like paths
Develop where running water enters standing water. Slows and sediment settles out
Maximum water a channel can hold
Cities with impermeable concretes cannot soak into ground and instead of flowing into streams flows to sewers Agriculture decreases vegetative cover
Hydrographs are charts that display the change of a hydrologic variable over time Geology (Rock Type; Impermeable=flashier hydrographs. Or Permeable)
Lack of drainage
Paleoflood hydrology is an interdisciplinary scientific method of reconstructing the history of flooding on rivers and streams from the basis of physical evidence of flooding. From a societal perspective, paleoflood hydrology provides a direct recordof the type of floods (largest floods) that are most likely to cause the greatest damage.
Floating on water
Rock or regolith on unstable slopes move under influence of gravity
Mass Movement Triggers
Angle of repose
The angle of repose, or more precisely the critical angle of repose, is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is given by the number (0°-90°)
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