Caracterização da camada impermeável em lotes do Perímetro Irrigado de Bebedouro - Petrolina-PE.

Abstract

It was verified the existence of impermeable layer in six drained areas of the Bebedouro irrigation district. It was evidenced the existence of the impermeable layer, into the soil profile of drains influence, only in three areas. A gravel layer without cementing clay, presents in the 045 and 082 areas, has conductivities varying from 1,33 to 1,69 m/day, which compared to the superior layer value, result in a decrease in the water flow velocity into the soil profile from 30 to 43%. Thus, it must not be considered as an impermeable layer, as it was originally conceived in the executing project.