Flood, levee, and erosion control glossary - V
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Vactor Waste
The waste material that is found in the
bottom of a catch basin.
Varied Flow
Depth of flow changes along the channel length.
Vegetation
Plants in general, or the sum total of plant
life in an area.
Vegetation Management
Removal of vegetation in and
adjacent to creeks to maintain the ability of channels to function as flood
protection facilities. In addition, vegetation is removed to meet local fire
code requirements and to reduce combustible weeds and grasses on property
adjacent to the streams within the District's jurisdiction. The control of
invasive nonnative vegetation is another purpose for which the District
undertakes vegetation control. Vegetation management can be accomplished
through mowing, discing, hand clearing, or herbicide applications (depending on
the environmental conditions of the site).
Vegetative Filter Strip
A facility that is designed to
provide stormwater quality treatment of conventional pollutants but not
nutrients through the process of biofiltration.
Velocity
Speed with which water should flow in a channel.
It depends on several factors, such as slope, smoothness and uniformity of
channel, area of flow and wetted perimeter.
Velocity Gradient
The rate of change of velocity with respect to distance normal to the direction of flow.
Velocity Head
The kinetic energy term in the total energy
of flow.
Vertical Evacuation
The use of higher rise structures as
"vertical refuges" during a flood or hurricane.
Vertical Mowing
The use of a mechanical device with
vertically rotating blades for thatch and grain control.
Vertical Stratification
Water layers of varying density,
which occur in an estuary when colder, saltier water underlies warmer and
fresher water.
Vetiver Grass
Any of several varieties of grass (the most
common is Vetiveria zizanioides) widely used for erosion control and moisture
conservation. When planted as a contour hedge it slows runoff and filters
sediment. The curtain-like root system helps anchor soil and competes minimally
with adjacent crop roots.
Volatile Organic Compound (VOC)
A carbon-based substance,
which wastes away on exposure to the atmosphere.
Volatization
Loss of a substance through evaporation or
sublimation. When manure is spread on a field, ammonia-nitrogen in the manure
may volatize quickly and be lost as fertilizer unless it is incorporated into
the soil.
Vulnerability
Characterization of the nature and extent of
damage that may occur during flooding.
V-Zone
The velocity zone, or the portion of the coastal floodplain as marked on maps
prepared by the Federal Emergency Management Agency that is subject to high
velocity waters from wave action associated with the one-percent annual chance
flood. Also called the coastal high hazard area, the v-zone is usually
determined by the area subject to wave heights of three feet or greater. See A-Zone.
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For more information about Infrastructure Defense Technologies’ flood barriers and erosion control barriers and applications, please call us at 1-800-379-1822, email us at info@metalithH2O.com, info@infrastructure-defense.com or fill out our contact form.
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