SlopeThe slope of land surface is a crucial factor for constructing andoperating a landfill site. Very steep slopes will lead to higherexcavation costs, while flat areas are more suitable for landfillconstruction. Therefore, the flatter area gets a higher score. Thevery steep areas (>45%), the steep areas (25–45%), the moderatelysteep areas (20–25%) and the inclined planes (10–20%)were assigned grades of 0, 2, 4 and 8 respectively. The slightlysloping areas (<10%) that are the best candidates for landfilloperations received a grade of 10 (Kontos et al., 2005). Theresults are shown in Figure 3.
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