TM 5-814-9
SECTION II. TERMS
Assembly area
Drainage area
Paved space located after the wash stations to allow replace-
Rainfall catchment area common to a single runoff point.
ment of interior items, drying, assembly of vehicles into units,
Drainage structure
and final inspection prior to exiting the CVWF.
Construction used to collect and/or divert surface waters to a
collection system; includes inlets, trench drains, catch basins,
Bentonite
and manholes.
Clay with a high content of the mineral montmorillonite group.
Characterized by high adsorption and very high volume changes
Dual-purpose lab
with wetting and drying.
Area of a prewash facility that serves both wheeled and
tracked vehicles.
Biological treatment
Process in which bacteria and other microrganisms use waste
Effective depth
constituents as a food source; results in the breakdown of
Usable depth of sediment basin and/or lagoon for treatment or
complex organic materials into simple, more stable sub-stances.
settling purposes, after deducting the depth reserved for storage
of solids and freeboard allowance.
Bypass lane
Driving lane reserved for vehicles in the CVWF to go past the
Effluent
prewash basin and/or the wash stations to expedite forward
Liquid flowing out of a reservoir, basin, tank, or other container.
movement.
Energy dissipator
Cantonment
Structure used to dampen erosion potential of a flowing body of
Developed portion (city-like area) of a permanent military
water by reducing its forward velocity.
installation.
Equalization basin
Central vehicle wash facility
Receptacle used to dampen variations in the flow of water.
Structure designed specifically to clean large numbers of
Evaporation rate
tactical or transportation motor pool vehicles.
Rate at which water becomes a vapor and is lost from a body of
Chemical oxygen demand
water.
Standard laboratory procedure for measuring the oxygen
Filter charge
required for oxidation of carbonaceous (organic) material in
Total volume of water necessary to flood the surface of a filter
wastewater.
to a specific depth.
Cleanup time
Filter medium
Period required to clean a CVWF, including drainage and
Granular material (sand and/or gravel) in a filter through
cleaning of the prewash bath.
which water passes.
Cohesive soil
Filtration
Fine-grained soil that sticks together, such as a clay or silt.
Unit operation in which solid or colloidal material is separated
from a liquid by movement through a granular or porous
Collection system
material such as sand.
Network of underground conduits and appurtenances that
receives and conveys wastewater.
Flexor
Device installed in the bottom of a water bath at a prewash
Colloids
facility for causing the wheels or tracks of a vehicle to move up
Microscopic suspended particles that do not settle in a standing
and down (flex) to assist in removing dirt from the vehicle.
liquid and can be removed only by coagulation or biological
action.
Flushers
Devices such as water sprays that increase water flow and
Control building
velocity to prevent solids deposition or to remove deposited
Structure at a CVWF that provides the operator a central
solids in a pipe, channel, or other conduit.
location to observe the washing operations and regulate pumps,
valves, and other equipment.
Freeboard
Distance in elevation from the maximum water surface of a tank
Detention time
or basin to the top of its walls or overflow.
Theoretical period that it takes a particle of matter to flow
through a tank or basin.
Grade
Dissolved solid
Inclination or slope of a surface in terms of a ratio or percentage
Solid material remaining in a wastewater after filtering; deter-
of vertical rise to horizontal distance.
mined by specific tests.
Grease
Dosing tank
General term used to describe the lubricants applied to tactical
Receptacle that automatically and hydraulically empties itself
and TMP vehicles.
each time it is filled to capacity.
Glossary-3
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