AVALIA??O DA CONDUTIVIDADE HIDRáULICA EM áREAS DE RECARGA DO AQUíFERO GUARANI-MICROBACIA HIDROGRáFICA DO CóRREGO ESPRAIADO (SP)

摘要

The hydraulic conductivity of the saturated soil (Ksat) is a great relevance parameter in the evaluation studies of the natural vulnerability and therefore the environmental risk assessment. When it comes to fragile areas, as they are the recharge areas of sedimentary aquifers, the hydraulic conductivity shows even more important. For this study was adopted a representative area of the direct recharge of the Guarani aquifer. It is characterized by the Espraiado watershed, located in Ribeirão Preto district, SP (Brasil). The main soils of this area are: Quatzipsammentic Haplorthox (QH) and Typic Quartzipsamment (TQ). For the hydraulic conductivity (Ksat) of these soils, was used the saturated column method , whose values were correlated with those of granulometry or particle size and soil structure, considered as parameters more directly linked to Ksat. The direct correlations were between Ksat values and those sandy fraction. For the structure, this correlation occurred indirectly, indicating lower influence of this parameter on the hydraulic conductivity.