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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