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Soil  erosion  by  water  has  become  a  relevant  issue  at  global  scale. In  the  last  years  this  phenomenon witnessed a  spectacular  extension  and its effects are  becoming more  disturbing.The  majority  of  studies  on  water erosion  and land  degradation  in  Algeria  do  not or slightly integrate  spatial  analysis techniques by  GIS, to provide more knowledge  and  mapping  of  these  phenomena.In  this  study,  geographic  information  systems  were  used  to develop  a  number  of  thematic  maps  (slope,  topography,  hydrographic  network  map)  and  to  assess  and  map  the phenomenon of water erosion using the universal soil losses equation (USLE) in the Djelfa region,central Algeria. This watershed is characterized by a great irregularity in precipitation, steep slope and low vegetation cover, which makes it very vulnerable to erosion.The aim of thisstudy is to couple a GIS tool withthe USLE model to determine the rate of erosion by runoff (0.31 t/ha/year on average), to map the areas at risk of water erosion in the region of Djelfa, and disseminate the results for adequate decision-making.

GIS contribution to the mapping of zones at risk of water erosion in the Djelfa region, algeria