role of water in deserts

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water comes in many forms in a hot enviroment:

  • fog (coastal regions)
  • dew
  • soil moisture
  • ground water
  • precipitation (thunderstorms/ orographic rainfall)
  • river channels

           exogenous- originating from outside the arid area

           endoreic- ending at an inland lake e.g. lake Jordan where the river Jorden ends

          ephemeral- seasonal rivers

why do ephemeral flows occur?

  • after desert precipitation because: convectional storms can be torrential, fairly impermeable…


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