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Construction for Landscape Architecture by Jamie Liversedge, Robert Holden

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Mounds and landfill

Mounds should be formed in layers, typically 16 in thick, which should be consolidated using site machinery (for example earth-moving vehicles) in order to avoid later subsidence. Clay soils tend to be particularly problematic, because the consolidation of solid clay in layers can produce a mound which does not drain at all and it is therefore difficult to grow plants on it. In such cases, the mound should be formed using the sandwich method of alternating clay and gravel layers in a concave section of the clayey ground material (for example 20 in layers of clay topsoil alternating with 12 in layers of gravel). Grading material should be free of lumber or other vegetable matter, which may form voids. It should also be free ...

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