ABSTRACT: Reliable estimation of three dimensional hydraulic conductivity and effective porosity in an aquifer is particularly important to determine the site and depth of groundwater production wells. Three dimensional distribution of hydraulic conductivity and effective porosity in Mersin-Tarsus hillside and coastal aquifers that characterize delta-flood plain sedimentary system, was estimated by means of block kriging method. Validity of models in selecting appropriate drilling sites was demonstrated by the high correlation obtained between observed and calculated values. High and low values of hydraulic conductivity and effective porosity` are observed in close proximity of streams and distal fields, respectively.