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(4208) Free surface
1 - A water surface exposed to atmospheric pressure, such as the water surface in an open channel, or in a closed conduit not flowing full, or in a tank. 2 - In an unconfined aquifer, if capillary rise is negligible, the free surface and water table are identical. 3 - The upper boundary of seepage water in earth dams, levees and dikes. 4 - See 5251.
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Irrigation
Drainage
Dictionary - Surface Drainage Systems Terms
- Surface water hydrology
- Subsurface ice, or Interstitial ice
- Drainage area, Drainage basin, River basin, Catchment area, Catchment basin, Catchment, Watershed
- Water parting, Drainage divide, Divide, Watershed divide, Watershed boundary, Topographic divide
- Yield of drainage basin, Annual yield of drainage basin
- Interflow, Subsurface runoff
- Subsurface flow, or Underground flow
- Drainage modulus, or Drainage coefficient
- Subsurface water, Underground water, or Subterranean water
- Isopiestic line, or Pressure surface contour
- Pressure surface map
- Piezometric surface, or Pressure surface
- Water surface (groundwater)
- Phreatic surface
- Potentiometric surface
- Water surface slope
- Surface float
- Subsurface float
- Surface water
- External drainage
- Surface acre
- Surface tension
- Surface tension
- Surface bend, or Free bend
- Topsoil, or Surface soil
- Internal drainage
- Bio-drainage
- Drainage head
- Endogenic drainage
- Allogenic drainage
- Endoreic drainage
- Areic drainage
- Exoreic drainage
- Surface curves
- Surface area of reservoir, or Maximum water surface area
- Water surface
- Normal water surface elevation, Normal water level, Conservation water level, Storage level, Normal pool level, or Conservation storage level
- Drainage gallery
- Drainage wells
- Horizontal drainage blanket, Pervious blanket, or Drainage filter
- Composite surface of failure
- Critical circle, or Critical surface
- Line of seepage, or Phreatic surface
- Soil classification systems
- Hydraulic rollers, Circular roller, Elliptical roller, Vertical roller, Horizontal roller, Inclined roller, Submerged roller, or Surface roller
- Surface type fixed-wheel gate
- Friction drag, Skin friction, or Surface drag
- Top width, or Surface width
- Natural surface line
- Natural surface level, or Ground levels
- Transition-curve length, Transition face length, Transition surface length, or Curved transition length
- Cross-drainage work, or Drainage crossing
- Level crossing, or Level drainage device
- Syphon aqueduct, Drainage syphon, Cross drainage culvert
- Drainage overpasses
- Venturi flume drainage crossing
- Straight (line, surface) sharp cut-water, Equilateral cut-water, or Sixty degree straight sharp cut-water
- Drainage culvert, or Supply culvert
- Integrated production systems
- Cross drainage
- Inverted drainage well, or Disposal well
- Free surface
- Equipotential surface
- Seepage surface
- Depleted pressure surface
- Depleted phreatic surface, or Depleted water table
- Isobath of the piezometric surface
- Fluctuation of the piezometric surface
- Cycle of the piezometric surface fluctuation
- Surface irrigation
- Irrigation through buried drains, Irrigation-drainage, or Vallenhove process
- Surface drip irrigation
- Surface filtration
- Surface runoff
- Drainage
- Drainage channel
- Artificial drainage
- Lowland drainage
- Agricultural land drainage
- Drainage system
- Closed-drainage area, Blind drainage area, or Non-contributing area
- Drainage benefit
- Degree of drainage
- Surface water
- Field drainage
- Field drainage system
- Land drainage
- Natural drainage system
- Seepage drainage
- Subsurface drainage system
- Open channel drainage
- Surface drainage
- Surface drains
- Main drainage system
- Drainage fittings
- Drainage pump sump
- Drainage trench
- Drainage head
- Horizontal subsurface drainage system
- Natural drainage or Natural drainage capacity
- Improved drainage or Artificial drainage
- Random drainage system
- Surface inlet
- Trenchless drainage
- Open-channel drainage
- Convergent drainage pattern
- Natural drainage systems, or Random drainage systems
- Cutoff drainage system, or Intercepting drainage system
- Herringbone drainage system
- Gridiron drainage system
- Double-main drainage system
- Composite drainage system
- Grouping drainage system
- Zigzag drainage system
- Surface-cum-seepage drains
- Cross-slope ditch system, or Drainage-type terraces
- Drainage-density
- Drainage pattern
- Superposed drainage, Super imposed drainage or Inherited drainage
- Subsurface drainage, Under drainage, Subsoil drainage, Underground drainage, or Covered drainage
- Relief drainage system
- Convergent drainage system
- Subsurface drain, Under drain, Covered drain, or Buried drain
- Elkington drainage system, Sink-hole drainage
- Rerolle drainage system
- Across-the-slope drainage system, or Keythrope drainage system
- Vertical drainage, or Inverted well
- Mole drainage
- Field surface drain
- Surface drainage system
- Drainage coefficient, Drainage modulus or Drainage design rate
- Drainage design rainfall
- Drainage efficiency
- Drainage season
- Free surface
- Phreatic surface
- Piezometric surface
- Subsurface run-off
- Surface flow
- Surface runoff
- Angular drainage pattern
- Arterial drainage
- Dendrite drainage
- Drainage boards (also called prefabricated drains)
- Slot drainage
- Radial drainage pattern
- Trellis drainage pattern
- Drainage density
- Vertical subsurface drainage system
- Drainage pumping station, Drainage pumping plant
- Surface retarders
- Surface moisture, or Free moisture
- Smoothing cement, or Surfacer paint
- Surface dressing, or Surface treatment
- Pneumatic butyl valve (for pipeline distribution systems)
- Surface erosion
- Surface sealing (of soil)
- Surface creep
- Drainage terrace, Drainage control terrace, Interception and diversion terrace, Runoff control terrace, or Channel terrace
- Biological systems
- Surface dump
- Surface irrigation
- Land drainage
- Design drainage rate
- Soil drainage status
- Excessive drainage
- Imperfect drainage
- Surface water problem
- Water‑gathering surface
- Water neutral surface
- Water‑spreading surface
- Underdrainage
- Singular layout drainage design
- Natural drainage layout
- Composite layout drainage system
- Mole drainage
- Free drainage
- Poor drainage
- Drainage basin
- Hydraulic effectiveness of flood control systems
- Systems analysis, Operational analysis, System engineering, Mathematical modeling, Management science
- Systems compatibility
- Systems engineering
- Systems integration
- Decision Support Systems
- Surface water body
- Subsurface geology
