Soil Erosion is very serious environmental disaster in Haiti. It is linked to the intense deforestation that occurred in the country last three decades. In the southern part of Haiti, soil erosion has led to the change of the environmental geomorphology. The slopes with erodible soils, a semi-arid continental climate, and sparse vegetation cover have high potential for soil erosion in watersheds areas of the southern of Haiti. This research carries out the soil erosion analysis in the watershed overflows Laborde Lake. The objectives are to make a spatial and quantitative assessment of the consequences of soil erosion in the watershed of Laborde in southern of Haiti. The Empirical Soil Loss Model of USLE is used to calculate soil loss and the analysis result and presented with Geographic Information System (GIS) to quantify the potential risk of soil erosion. The precipitation data, the soil data, the DEM data, and the satellite images were used as inputs data to generate USLE factor values. In addition, matrix calculator was used to interactively calculate the potential soil loss. Further, the preparation of the soil erosion risk map.
The Laborde watershed covers a surface area of 565.83 ha and the map of soil loss shows that the soil erosion has occurred in the entire watershed however the highest level is around 88% and 114.5 tons / ha/ yr. of soil has been lost. Therefore, around 1.56% or 8,82 ha in this area have a good type of soil. In Comparison to the previous thematic maps of the different factors of USLE equation, the soil erosion loss map shows significant influence of the vegetation cover on the erosive effect of soils, particularly by the topography factor. It would be necessary to implement a sustainable conservation system, which can reduce the soil loss and its effects. Since only 31% of the watershed has covered vegetation.
Key Words: USLE, GIS, water erosion, environment, Laborde watershed

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