Savanna Journal of Basic and Applied Sciences 4(1):43-53
A Multipreliminary Approach to the Delineation of Groundwater Potential Zones: A Study of Ijero Ekiti and its Environs, Southwest-Nigeria
Ologe, O., Ahmed, J. and Adegoke, A. O

This study employs multipreliminary approach, remote sensing (RS) and geographical information system (GIS) methods to determine groundwater potential zones in basement terrain of Ijero Ekiti and its environ of parts of SW-Nigeria. The thematic layers considered in this study are Lithology, Drainage, Soil, Lineament, Land use, slope and soils from remotely sensed data and other data sources. The soil and drainage maps were digitized from published maps. The thematic layers were finally integrated using ArcGIS 10.3 software to yield a groundwater potential zone map of the study area. On the basis of relative contribution of each of thematic layers towards groundwater potential, the weight of each thematic map was selected. The individual theme weight was multiplied by its respective class weight and all the raster thematic layers were aggregated in a linear combination equation. The result revealed that the study area can be categorized into three different groundwater potential zones: low, moderate and high. Areas with low potential account for 3.33% of the study area while moderate and high account for 58.7% and 38% respectively of the total study area. Consequently, the study area offers about 96% as moderate groundwater potential. The RS and GIS techniques have proved useful for the identification of groundwater potential zones. On a regional level, groundwater details at specific points can be found through the use of some other techniques such as surface geophysical methods. Keywords