Geospatial Assessment of Site Suitability for Solid Waste Dump Sites in Ido Local Government Area Oyo State Nigeria
Abstract
Finding suitable disposal sites is one of the most difficult aspects of solid waste management. Non-scientific and ineffective disposal methods have a harmful impact on the environment, lowering people’s quality of life. An integrated Remote Sensing and Geographical Information System approach was applied to determine suitable solid waste dump site locations in Ido local government area, Oyo state, Nigeria. The dataset of the study area used for this research are Landsat 8 Operational Land Imager/Thermal Infrared Sensor (OLI/TIRS) for the year 2020 and of 30m resolution, Geo-Eye satellite imagery obtained from Google Earth, Shuttle Radar Topography Mission (SRTM) imagery of 30m resolution, geological map from Nigeria Geological Surveys, the soil map, data on road network obtained from Open-street map and the geometric data (Coordinates) of the existing dump site within the study area acquired through field survey using a Global Positioning System (GPS). From an extensive literature review and expert opinion combined with Environment Protection Agency (EPA) standards for identifying the best area suitable for dump sites, six criteria were adopted for this study: slope, proximity to road, proximity to water body, geology, soil type, and proximity to residential areas. These criteria were used with the EPA standard as the basis for processing and analysis of acquired data using ArcGIS 10.5 software. The result shows that out of the total 979 km2 mapped for suitability for solid waste-dump site in the study area, 61.7km2 has very low suitability, 262km2 with low suitability, 334.6km2 is moderately suitable and 320.7km2 is highly suitable for waste dump site. The study concluded that the existing solid waste-dump site in the area is not suitably located and is not enough to serve the entire study area. The study recommended the data and findings in the study to be adopted as a site suitability analysis model that will serve as a guide for approval of dump site; a relocation of the existing dump site to areas with high suitability and a study on locating sites for industrial (hazardous) solid waste from clues obtainable from this study.
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