role of water in deserts

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…