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Storm Hydrographs

Page history last edited by Stephanie Richards 14 years, 1 month ago

A storm hydrograph shows the response of a river drainage basin to a period of rainfall. They show the volume of water passing a certain point on a river, measured in cumecs in relation to volume of rainfall.

 

 

Features of a Storm Hydrograph


Lag Time

Peak Precipitation

Peak Flow/Discharge

Rising Limb

Cumecs

Storm Flow

Falling Limb/Recession

Base Flow/Ground Water Flow

 

 

Low Peak Discharge


 

Possible Causes


Afforestation

Fields - No or little urbanisation

Gently sloping valley

Sandy Soil

Low rainfall

Reservoir or Dam upstream

Summer

 

High Peak Discharge


 

Possible Causes


Deforestation

Urbanisation

Steep sloping valley

Clay Soil

Heavy or prolonged periods of rainfall

Winter

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