Glossary of Terms in Soil Science
- underground runoff (or seepage)
Water flowing toward stream channels after infiltration into the ground.
- undifferentiated soil map unit
Soil mapping unit in which two or more soil units occur but not in a regular geographic association. For example the steep phases of two or more soils might be shown as a unit on a map because slope is the prime characteristic. See also association / soil and complex / soil.
- unsaturated flow
The movement of water in a soil that is not filled to capacity with water.
- upper plastic limit
See liquid limit.
- urban land
Areas so altered or obstructed by urban works or structures that identification of soils is not feasible. A miscellaneous land type.
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