Hydrograph Components

• For developed economies


  Provides concessions for uses
• Se have
• Colonial compe
• Hydrograph Components


  Storm Hydrograph
• Cumecs

  • Shows variations of river discharge over a short period
  • Cubic metres per second, unit of discharge
• Approach Segment


  Discharge prior to storm
• Rising Links


  Shows quick rise in discharge
• Bankfull Discharge


  Channel full, any further increase - flood
• Peak Discharge


  Maximum river discharge
• Lag Time


  Time between max rainfall and max discharge
• Receding Limb


  Shows discharge decline after peak
• Storm Flow


  Stream discharge after rainfall
• Storm Hydrograph


  1. Rain falls on drainage basin in large amounts

  2. Overland Flow occurs as precipitation > infiltration rate, rising limb builds to peak

  3. After a few hours, overland flow reduces and stops, Throughflow then contributes to discharge and stops floodwaters going down as fast

  4. Base flow takes over