rivers, floods and management

Water Balance 

• Worked out by inputs and outputs --> affects how much water is stored in the basin. 
• The water balance in the UK is seasonal. 
• Wet Season - precipitation exceeds evapotranspiration --> surplus --> ground stores fill --> runoff which leads to higher discharge and therefore a higher river level.
• Dry Season - precipitation is lower than evapotranspiration --> ground stores depleat --> not replaced. 
• Deficit is recharged in the next wet season. 

River Discharge 

Affected by PeTeR :

• Precipitaion --> more = high discharge 
• Temperature --> high = low discharge 
• Removal of water --> more = low discharge 

Storm Hydrograph 

Affected by :

• Characteristics (size,shape,streams)
• Vegetation 
• Precipitation 
• Temperature 

Deposition 

Energy reduced by :

• Reduced rainfall 
• Friction 
• Mouth 

Hjulstrom Curve 

Shows link between competence and velocity

Greater velocity = greater energy

The Long Profile 

Shows the height of…