Evaluating the Suitability of Waste Dumpsites using Geo-spatial Techniques in Kaduna Metropolis, Nigeria

Abstract

This study evaluates the suitability of dumpsites in Kaduna Metropolis, Nigeria, Africa with view to map out optimal sites that will be suitable for siting of dumpsites using GIS and Remote Sensing. Diverse array of information including multi-spectral satellite imagery like cloudless Sentinel 2A Geo-referenced data, climate data, and Digital Elevation Models, Software tools QGIS 3.32.1 and ArcGIS 10.8 were employed Analytical Hierarchy Process facilitated the assignment of weights to thematic datasets, assessing consistency ratios Integration of these datasets via the Weighted Linear Combination method yielded suitability sub model map for waste dumpsites. Finally, final suitability map was produced through weighted overlay analysis. The results revealed the periphery of the metropolis offers more favorable conditions for the siting of dumpsites. In contrast, the central core presents significant challenges due to its high tensity urban environment, intense socio-economic activities, and proximity to infrastructure. The highest proportion of land in Kaduna Metropolis is classified as Highly Unsuitable for dumpsite siting, covering 48.15% of the total area surveyed, while the lowest proportion falls into the Highly Suitable category, representing only 0.30% of the surveyed area. It is recommended to prioritize dumpsite development in the less densely populated periphery, engaging stakeholders through transparent decision-making processes. Furthermore, the spatial disparities in dumpsite distribution highlight the need for strategic planning and phased transitioning towards a more balanced distribution of waste management infrastructure.