A separation in an "upper" and a lower floor might have several
advantages:
- protection from wild animals
- protection from frequent inundations
- indirect "heating" of the upper floor at cold nights by animals
kept in the basement
In view of strong summer rainfalls at the horn of Africa, but
also taking into account high temperature differences between day and night in some seasons, all three possibilities seem to be applicable as reason for this building
method.
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