The moisture content of a soil is the ratio of the mass of water in a soil to the mass of solids.
Where:
mw = Mass of water (kg or lbs)
ms = Mass of solids (kg or lbs)
The moisture content is thus a ratio which can be greater than 1. It can also be expressed as a percent.
On one of my recent projects, moisture contents on the drill core ranged from 12% – 14.4% for sand, 14.9% – 37.2% for clay, and 25.3% – 35.7% for silt. Moisture content is normally tested and reported by a geotechnical engineer when drilling is done.
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