river dicharge

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  • River discharge  factors:
    • intensity and duration of the storm
      • if both high = steep rising limb> exceeded infiltration capacity of soil
    • antecedent rainfall
      • heavy  rain on saturated soil = steep rising limb
    • snow
      • when melted = ^ discharge
    • porous soil type/ permeable rock type
      • limestone- less steep graph
    • impermeable rock type
      • granite+ clay - rapid ^ in discharge
    • size of drainage basin
      • small basin = short lag time
    • shape of drainage basin
      • shorter lag time in round basin then elongated
    • slope angle
      • steep slope = steeper rising limb and shorter lag time
    • temperature
      • ^ temp = ^ evapotranspiration = reduced dicharge
    • vegetation
      • varies with season> summer = more leave> more interception > peak discharge lower
    • land use
      • water runs quiker of impermiable surfaces > caraven parks + land trampled by cattle = ^ peak discharge + decrease in lag time
    • urbanisation
      • main human impact. reduces lag time ^ peak discharge

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