Evaluating Groundwater Potential and Hydrogeological Environment By Classification Of Transmissivity Magnitude And Variation In Aquifer Bearing Rocks In Some Communities In Okigwe Local Government Area Southeastern Nigeria

This report evaluates the groundwater potential and hydrogeological environment of some communities in Okigwe LGA by classification of transmissivity magnitude and variation in aquifer bearing rocks using the methods of statistical testing and Krasny’s classification. A total of twelve VES profiles were carried out with the aid of Omega 0198 Terrameter using the Schlumberger array with a maximum current electrode separation of 800m. The VES data were analysed with the aid of IP12Win computer software. Results of the final interpretation were used to generate aquifer hydraulic parameters. Results of the transmissivity analysis based on transmissivity index show that three locations have positive extreme anomalies which indicate zones with high groundwater supply potential. The remaining nine locations have negative extreme anomalies which indicate zones with negligible groundwater supply potential. The Krasny’s classification of transmissivity magnitude shows that the coefficient transmissivity for all locations in the study area is greater than 1000 which is designated as very high transmissivity magnitude, implying high groundwater potential. Also, the results of the Krasny’s classification of transmissivity variation show that the standard deviation of tansmissivity index of the study area is < 0.2 which indicates that the hydrological environment of the study area is homogeneous. Keywords: Groundwater, hydrogeological environment, transmissivity magnitude, transmissivity variation, Krasny’s classification