Estimation of aquifer secondary hydraulic parameter distributions from surficial Geophysical measurement of primary parameters at Ngor-Okpala local government area of Imo State was carried out. The parameters estimated are practically significant in groundwater management. With the help of average permeability value for fine to coarse sandy formations, transmissivity and Kσ-values were obtained in addition to the Dar-zarouk parameters. The primary data which were validated by constraining the field data with the data obtained from logged borehole were converted to maps along with the estimated secondary parameters. Their distributions are diagnostic of significant information needed in groundwater assessment. The maps can also be used to improve the quality of model in the area.