GIS Based Multi-Criteria Analysis For Suitable Solid Waste Disposal Site Selection: A Case Of Tarcha Town

Abstract

New Site Selection For Municipal Solid Waste Dumping Is A Great Concern For The Urban Government In Most Countries Worldwide Today. In Ethiopia Solid Waste Disposing System Is A Serious Problem In The Urban Areas Including Tarcha Town; Because Most Solid Wastes Are Not Dumped In Suitable Sites And Has A Problem Of Waste Identification. The Current Waste Disposal System Of The Tarcha Town Is Open Dump System As Well As The Site Is Filled Out And Causing Social And Environmental Problems. The General Objective Of The Study Is To Select The Suitable Solid Waste Disposal Site By Using Arcgis10.3 And Multi-Criteria Of Evaluation Technique. The Sswds Selection Constrains Including Land Use Land Cover, Slope, Well Point, Soil Type, Distance From Streams/Rivers, Distance From Major Road And Socio-Economic Criteria (Distance From Nearby Settlements, And Center Of The Town, And Size Of Site) Are The Determinant Criteria To Evaluate Potential Solid Waste Disposal Site. The Main Data Used In This Study Are Scanned Existing Sketch Map Of Tarcha Town, And Digital Elevation Model (Dem). The Common Methods Conduct To Data Analysis Are Convert From Polygon To Raster, Reclassify And The Spatial Model Will Involve Geographic Modeling Functions And Coincidence Modeling And Integration (Weighted Overlay Suitability Models) Was Computed In Gis And As Well As Creating Land Slope(Counters) From Dem By Using Global Mapper19. Ahp In Which Pair Wise Comparisons Will Also Be Used To Determine The Alternative In Terms Of Each Criterion Is One Of The Most Commonly Used Mcdm Tools. The Suitability Option Ranges, Not Suitable, Less Suitable, Moderately Suitable, And Highly Suitable According To Criteria Of This Study. The Results Showed That, 192.68ha (1%) Of The Study Area Is Highly Suitable, 8968ha (42%) Of The Area Is Moderately Suitable, 11535.8ha (55%) Less Suitable And 413.2ha (2%) Of Study Is Not Suitable For Solid Waste Dumping Site. The Finding Of The Study Indicates That 3 Candidate Solid Waste Disposal Sites In Relation To Those Evaluating Criteria. By Considering Environmentally Sound, Economically Feasible And Social Sustainability Of The Residents These Sites Are Ranked As Site1 Are The Best Suitable Solid Waste Disposal Site And Site 2 And 3are The Second And Third Suitable Site With Their Area Coverage Of 111ha, 58.2ha, And 23.48ha Respectively. The Municipality Should May Use The Suggested Site Looking Appropriate Sites For The Disposal Of Solid Wastes. It Is Necessary That Further Studies Recommended By Increasing The Factors Which Missed In This Study.