Abstract
The main objective of this study is to know the effect of long-term irrigation with treated wastewater (TWW) in hydraulic conductivity of irrigated soils of AL-Hadba EL-Khadra agricultural project, Tripoli Libya., which has been under the influence of irrigation with wastewater since 1970. This study highlighted that the hydraulic conductivity values Ranging between "moderate" and "moderately rapid which are typical levels for soils under study which have sandy and sandy loam soil texture.