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Placement water content

Short answer

Placement water content is the moisture at which soil is compacted in the field, usually specified as OMC ±2%. Compacting dry of optimum yields higher strength but higher permeability and swelling risk; wet of optimum gives lower permeability and better flexibility for earth dam cores.

Describe placement water content.

Placement water content is the water content at which the soil is placed and compacted in the field. It is usually specified relative to the OMC (for example OMC ±2%\pm 2\%). Dry-of-optimum placement gives higher strength and stiffness but higher permeability and swelling potential; wet-of-optimum placement gives lower permeability, lower strength and better flexibility, as needed in the core of an earth dam.

✓ Answer checked by Claude Opus 5.5 (high effort)

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