The researchers used geoelectrical resistivity surveys to find potential groundwater sources in Ota, Nigeria. They found multiple layers of soil and rock, including a sandy aquifer, at different depths in the study area. The top of the aquifer was located between 40-83.5 meters in one location and 40-112.4 meters in another. The aquifer was found to be highly porous, with porosity values ranging from 28% to 74%. The study showed that the aquifer system in the area is complex and varies in depth due to the uneven terrain.