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DRAINAGE BASIN SYSTEMS
THE RIVER SYSTEM AND ATMOSPHERIC PROCESSES
Rivers are open systems with
inputs & outputs of energy
(Evapotranspiration, solar
radiation,) and matter
(precipitation, runoff). Energy
and matter are stored within the
system and transferred between
the stores.

Factors affecting Drainage Basins:

Type of precipitation (e.g. snow has a…

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FLOOD (STORM) HYDROGRAPHS
A hydrograph is the discharge of a river. They record the response of a drainage basin to an
individual precipitation event over a short timescale.




TERM DEFINITION
Base flow Water that reaches the stream via groundwater flow.
Runoff or Water that reaches the stream via overland flow…

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Factors affecting the flood hydrograph:

SHORT LAG TIME LONGER LAG TIME
FACTOR (FLASHY) Lower peak and more gentle rising &
recession limbs.
Higher peak and steeper rising &
recession limbs.
Basin size Smaller Larger
Basin shape Circular Elongated
Relief Steeper slopes Gentler slopes
Type of Intense rainfall; rapid snow melt.…

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