A playa. Image credit bergoiata.com

A playa. Image credit bergoiata.com

ZIMSEC O Level Geography Notes: Playas

  • These are sometimes known as inland drainage basins.
  • Due to the fact that there are no permanent drainage patterns in deserts any rain that falls either evaporates or infiltrates into the soil or runs off and drains¬†into basins.
  • Basins are depressions.
  • When rain falls temporary rivers that flow in canyons/bahadas are formed and these may eventually drain in a basin/depression.
  • These rives form lakes in these depressions.
  • When these lakes dry up due to evaporation they are turned into salt flats.
  • These temporary lakes and salt flats are known as playas or sebkhas.
  • Examples of these can be found in the Sahara desert.
  • When alluvium is deposited at the edge and overlies the edge of the pediment around the playa it is known as a¬†peri-pediment.
  • Most deserts are characterised by inland drainage basins as few rivers e.g. the Nile have enough water supply to flow and persist through the deserts.
  • Most form inland drainage basins/lakes/playas.

To access more topics go to the Geography Notes page.


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