Integration of GIS and F-Hydra Model for Aquifer Vulnerability Monitoring in the Afram Plains, Ghana

Thumbnail Image
Journal Title
Journal ISSN
Volume Title
Journal of Geoscience and Environment Protection
Aquifer vulnerability is a critical issue across the entire globe due to the de pletion of groundwater and escalation of pollution levels, which poses a det rimental effect on the natural environment. To ascertain this contamination risk, an extensive study has been conducted to assess the aquifer vulnerability by using the F-hydra model. This paper presents the vulnerability technique for the theory and application of flow accumulation, land-use and hydraulic conductivity. The model was applied to a shallow aquifer in eastern Ghana’s Volta River Basin, with the results being compared to the standardised DRASTIC model. The model follows the aquifer vulnerability assessment concept of the source pathway receptor where flow accumulation represents the ponding areas with downward percolation of contaminant to the water table, land-use represents the human activities at the land surface, and hy draulic conductivity represents the driving force leading to the movement of contaminant. The results reveal that the moderate vulnerability region covers 51.55% (2598.12 km2 ) of the entire area. The high and low vulnerability re gions cover a significant percentage of the area 1.13% (56.52 km2 ) and 47.32% (2384.93 km2 ), respectively. The final vulnerability index was largely influ enced by the removal of the hydraulic conductivity and land-use parameters. The model was validated with nitrate concentration in drilled wells in the study area. The maps produced in this study could be utilised as a guide to vulnerability by policymakers, groundwater manager and planners aimed at preserving the integrity of this vulnerable resource
GIS, Vulnerability, Vulnerability, Nitrate Contamination, Groundwater, ACE: Energy and Environmental Sustainability, University of Energy & Natural Resources, Ghana, Power