Landfill site selection using GIS and Multicriteria Decision Analysis : A Case Study of Butwal Sub-Metropolitan City

In developing country like Nepal there are not enough technology forscientific solid waste management and is dependent on traditionaldirect wastes disposal on specified area (landfill site). This study utilizesGIS and Multicriteria Decision Analysis for the selection of landfill sitesin one of the growing city of Nepal, Butwal. Different factors like road,river, slope, land use land cover(LULC) and built-up were determinedaccording to past literatures and existing data availability. The dataused in this study are open data available through openstreetmapand QGIS software was used for data cleaning and analysis. The LULCdata used was downloaded from Esri 10 m high resolution data 2022from Esri living atlas. Each data were differentiated into five classesunsuitable, less suitable, moderately suitable, suitable and highlysuitable on basis of proximity and their characteristics. Weightage wasgiven to each criteria on basis of Analytical Hierarchy Process (AHP)through pairwise comparison matrix. Finally, overlay resulting a finallandfill suitability was obtained. The result shows 0.01% highly suitable,10.61% suitable, 53.12% moderately suitable, 34.96% less suitable and1.29% unsuitable land availability for landfill site in Butwal. It is seenthat there is very less highly suitable region for landfill site in Butwal andsuitable region for landfill lies in southern part of Semlar and Motipurwith neighbouring region of Sudhdhodhan Gaupalika, northern partof Belbas, eastern part close to Charange and few in Northern region.Thus, obtained result is supposed to help in the decision making forproper landfill site selection.