CASE STUDY Geohydrology An aquifer reaching a depth of about 100 m with a thick dense clay layer at its base underlies the site. The first 10–15 m of the aquifer is characterised by sandstone lenses. The subject site is at a groundwater divide that results in very low hydraulic gradients and, consequently, very low natural groundwater flow velocities. At the north of the site, shallow groundwater flows to the northwest whereas the shallow gr

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