The hydrological cycle

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  • The hydrological cycle
    • A rivers drainage basin is the area surrounding the river where the rain is falling
      • This area is also called the rivers catchment
    • The boundary of a drainage basin is the watershed
      • Any precipitation falling beyond the watershed enters a different drainage basin
    • Drainage basins are open systems with inputs and outputs
    • Water comes into the system as precipitation and leaves via evaporation, transpiration and river discharge
    • The water balance shows the balance between inputs and outputs
      • In wet seasons precipitation exceeds evapotranspiration
        • The creates a water surplus
      • In drier seasons precipitation is lower than evapotranspiration

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