Statistical comparison between the adjustment equations of the water retention curve in sanitary landfills coverage soil

Residual soils result from chemical weathering, so their characteristics depend on environmental factors, in addition to origin, topography, drainage and geological age. In the unsaturated condition, behavior of is conditioned by suction, which refers state soil under reduced pressure. The aim this study compare water retention curve fitting equations tropical through filter paper technique analytical analysis data obtained test. By performing statistical evaluation parameters used proximity its values necessary boundary conditions defined for equation explain suctioning as it loses moisture naturally environment, was verified that Van Genuchten appeared be most suitable.