Relationship between topographical pattern and groundwater flow directions in part of Ogun State

Adebisi N.O. and Asaye O.O

Olabisi Onabanjo University, Department of Earth Sciences, Faculty of Science. Ago-Iwoye, Ogun Sta

*Corresponding   Author  E-mail:  noadebisi@yahoo.com, Tel:+23408055607795

Accepted 09 May, 2012

Abstract

The manner in which water flows above and below the ground surface has been described by analogue method, which lack accuracy when data of different scales are employed. In this study, a computer-based method was employed to unravel the dominant control of flow of water from traditional data. Field data on well locations and existing maps were input for manipulative operation and output products. Overlay of maps which relate to geology and drainage network on the DTM generated from GPS readings reveals that the drainage pattern, which develops on the surface of the area is controlled by slope of the surface, the types and attitudes of the underlying rocks. The depression and uplifting caused by an assumed fault plane, further provide evidences on the relationship between the geology and surface configuration of the study area. The drainage system and rock types in the study area have contributed largely to the overall understanding, and in finding answers to questions that require integrating topographic pattern with surface and ground water direction.

Keywords: Computer-based method, GPS, Overlay, Landform and DTM