Factors Affecting Discharge

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  • Factors Affecting Discharge
    • Amount and Type of Rainfall
      • Lots of rain & shirt, heavy periods of rainfall therefore more runoff.
        • Therefore lag time is decreased, so discharge increases
    • Temperature
      • Hot, dry conditions &cold, freezing conditions result in hard ground - increases runoff
        • Lag time is decreased, so discharge increases
    • Previous Weather Conditions
      • After lots of rain, soil can become saturated (can't absorb any more water) Soil won't be able to absorb anymore rainwater so runoff increases
    • Rock Type
      • Water goes through pore spaces in permeable rock & flows along cracks in pervious rocks - therefore not much runoff
      • Water cannot go into impermeable rock so there's a lot of runoff
        • Lag time is decreased, so discharge increases
    • Land Use
      • Urban areas have drainage systems & are covered with impermeable materials. so runoff increases
        • Lag time is decreased, so discharge increases
    • Relief (how height of land changes)
      • Lots of runoff occurs on steep slopes.
        • Lag time is decreased so discharge increases

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