لخّصلي

Both above-ground and below-ground landfill configurations are commonly used.It is the best suited for flat terrains with shallow groundwater elevations.Few other important aspects related to landfill configurations are briefly discussed in the following subsections.Figure 18.3 (d) is a below-ground option called valley fill (or canyon fill) used in mountainous terrains.These are suitable for relatively flat areas.

Both above-ground and below-ground landfill configurations are commonly used.
Four such configurations are given in Figure 18.3. Figure 18.3 (a) is an area fill
(above ground) that requires no excavation. It is the best suited for flat terrains
with shallow groundwater elevations. Figure 18.3 (d) is a below-ground option
called valley fill (or canyon fill) used in mountainous terrains. Figure 18.3 (c) is
above and below ground fill and Figure 18.3 (b) is a Trench fill, and both are
combined above and below ground options. These are suitable for relatively flat
areas. Trench fills are often used for small scale waste streams. Few other
important aspects related to landfill configurations are briefly discussed in the
following subsections. Figure 18.4 shows excavation for Calgary Biocell which is
above and below ground fill.