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This study was carried out in order to evaluate the soils that overlay the Urucuia Aquifer System, located in the western portion of Bahia state, Brazil. The soils are represented by homogeneous thick coverage important to the recharge of the aquifer. The studies were developed in reddish-yellow sandy latossoil, and quartzarenic neossoils, applied to plantation. The study consists of evaluation of the infiltration conditions of these soils, by the execution of 30 field infiltration tests with the double concentric ring method and open-end method, and some grain size assays, looking after a correlation between hydraulic conductivity values, types of uses and grain size composition. The values of vertical hydraulic conductivity (Kv) with concentric rings reflect the soils uses, where the lowest values, of 10 -5 to 10 -6 m/s were observed in soils where the main uses are grass, residential area, not-paved road and soy plantation; and the average values in natural soils are about 10 -4 m/s. The values of Kv resulted from the open-end tests method are lower, of the order of 10 -6 m/s, with variations in depth, attributed in some cases to the increase of the total amount of clay in the soils profile, to the moisture content and the use that the soils are submitted. The results had shown that the natural conditions of water infiltration are affected by the several intervention features and soil use and occupation, and show that the preservation of reserve areas is important to the recharge processes in long period terms, so that the quality of the aquifer is not compromised in the future.

Condições de infiltração em solos na região de recarga do sistema aqüífero Urucuia no oeste da Bahia sob diferentes condições de usos