International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)

1850. Hardpan, or Ortstein : A formation which occurs by precipitation of dissolved materials, such as calcium carbonate or silica, at certain depths below the surface year after year. When this accumulation takes place, the subsoil is more or less firmly cemented and limits downward movement of water. This formation does not soften when wetted by water.

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