flood hydrographs

• what are flood hydrographs used for?

  represent rainfall for drainage basin of river and discharge
• what factors affect if a flood hydrograph will be flashy?

  • short lag time
  • steep rising limb
  • steep falling limb
  • high peak discharge
• what factors affect if a flood hydrograph will be subdued?

  • long lag time
  • gradual rising limb
  • gradual falling limb
  • lower flood risk
  • low peak discharge
• what factors increase surface runoff?

  • pastoral farming
  • deforestation
  • high rainfall
  • antecedent rainfall
  • impermeable underlying geology
  • high drainage density