Techniques that permit a quick, practical, and satisfactory evaluation of electrical logs were developed to estimate the volume and distribution of saline water in aquifers in Louisiana. Of about 200,000 available electrical and induction‐electrical logs, approximately 1000 representative logs (about 1 per township) were selected for detailed analysis. An empirical relation, called the field formation resistivity factor F_f, was determined as the ratio of formation resistivity R₀ to water resistivity R_w corrected to a temperature of 25°C, F_f = R₀/R_w. The field formation resistivity factor was used to estimate the altitude of groundwater salinity interfaces of 1,000, 3,000, and 10,000 mg/l (milligrams per liter) of dissolved solids. Average coefficients of permeability values and bed thickness information were used to determine coefficients of transmissibility. Using theoretical and standard conditions of well design, yield, and aquifer thickness, well yields were computed. This permitted an areal comparison of yield from each of the saline water zones.