unde - uppe
- undercurrent
- underditch
- underditching
- underdrainage
- underfeed
- underflow
- underflow conduit
- underflow density current
- underflow section
- underflowing irrigation
- underground basin
- underground cavern
- underground conditions
- underground flow
- underground reservoir
- underground water
- underground water level
- underground water parting
- underground water surface
- underground watershed
- underlying bed
- underlying bedrock
- underlying confining bed
- underlying rock
- underlying surface
- underlying topography
- undertow current
- underwater gradient
- underwater range
- underwater soil
- undisturbed flow
- undisturbed pressure
- undisturbed sample
- undisturbed soil
- undisturbed stream
- undisturbed structure
- undulating ground
- unending circulation
- unfailing spring
- unfilled porosity
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