Slope
The slope of land surface is a crucial factor for constructing and
operating a landfill site. Very steep slopes will lead to higher
excavation costs, while flat areas are more suitable for landfill
construction. Therefore, the flatter area gets a higher score. The
very steep areas (>45%), the steep areas (25–45%), the moderately
steep areas (20–25%) and the inclined planes (10–20%)
were assigned grades of 0, 2, 4 and 8 respectively. The slightly
sloping areas (