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

Prabin Banstola; Keshav Raj Bhusal; Surya Adhikari

Prabin Banstola Lecturer, School of Engineering, Pokhara University, Nepal.
Keshav Raj Bhusal Research Scholar, Institute of Engineering, Paschimanchal Campus.
Surya Adhikari Research Scholar, Institute of Engineering, Paschimanchal Campus.

Abstract

In developing country like Nepal there are not enough technology for
scientific solid waste management and is dependent on traditional
direct wastes disposal on specified area (landfill site). This study utilizes
GIS and Multicriteria Decision Analysis for the selection of landfill sites
in one of the growing city of Nepal, Butwal. Different factors like road,
river, slope, land use land cover(LULC) and built-up were determined
according to past literatures and existing data availability. The data
used in this study are open data available through openstreetmap
and QGIS software was used for data cleaning and analysis. The LULC
data used was downloaded from Esri 10 m high resolution data 2022
from Esri living atlas. Each data were differentiated into five classes
unsuitable, less suitable, moderately suitable, suitable and highly
suitable on basis of proximity and their characteristics. Weightage was
given to each criteria on basis of Analytical Hierarchy Process (AHP)
through pairwise comparison matrix. Finally, overlay resulting a final
landfill suitability was obtained. The result shows 0.01% highly suitable,
10.61% suitable, 53.12% moderately suitable, 34.96% less suitable and
1.29% unsuitable land availability for landfill site in Butwal. It is seen
that there is very less highly suitable region for landfill site in Butwal and
suitable region for landfill lies in southern part of Semlar and Motipur
with neighbouring region of Sudhdhodhan Gaupalika, northern part
of Belbas, eastern part close to Charange and few in Northern region.
Thus, obtained result is supposed to help in the decision making for
proper landfill site selection.

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