LTN Appendix IX

Appendix IX

Glossary

Appendix IX – Glossary of Terms and Acronyms 1

Appendix IX – Glossary of Terms and Acronyms 2

Glossary

7Q10 The annual minimum 7-day consecutive low flow, which on average will be exceeded in 9
out of 10 years.
ACOE United States Army Corps of Engineers.
B (Class B) Class B Water Quality Classification. This classification denotes freshwaters protected for
primary recreation and other uses suitable for Class C. Primary recreational activities
include frequent and/or organized swimming and other human contact such as skin diving
and water skiing.
basin The watershed of a major river system. There are 17 major river basins in North Carolina.
benthic Aquatic organisms, visible to the naked eye (macro) and lacking a backbone (invertebrate),
macroinvertebrates that live in or on the bottom of rivers and streams (benthic). Examples include, but are not
limited to, aquatic insect larvae, mollusks and various types of worms. Some of these
organisms, especially aquatic insect larvae, are used to assess water quality. See EPT index
and bioclassification for more information.
benthos A term for bottom-dwelling aquatic organisms.
best management Techniques that are determined to be currently effective, practical means of preventing or
practices reducing pollutants from point and nonpoint sources, in order to protect water quality.
BMPs include, but are not limited to: structural and nonstructural controls, operation and
maintenance procedures, and other practices. Often, BMPs are applied as system of
practices and not just one at a time.
bioclassification A rating of water quality based on the outcome of benthic macroinvertebrate sampling of a
stream. There are five levels: Poor, Fair, Good-Fair, Good and Excellent.
BMPs See best management practices.
BOD Biochemical Oxygen Demand. A measure of the amount of oxygen consumed by the
decomposition of biological matter or chemical reactions in the water column. Most
NPDES discharge permits include a limit on the amount of BOD that may be discharged.
C (Class C) Class C Water Quality Classification. This classification denotes freshwaters protected for
secondary recreation, fishing, wildlife, fish and aquatic life propagation and survival, and
others uses.
channelization The physical alteration of streams and rivers by widening, deepening or straightening of the
channel, large-scale removal of natural obstructions, and/or lining the bed or banks with
rock or other resistant materials.
chlorophyll a A chemical constituent in plants that gives them their green color. High levels of
chlorophyll a in a waterbody, most often in a pond, lake or estuary, usually indicate a large
amount of algae resulting from nutrient over enrichment or eutrophication.
coastal counties Twenty counties in eastern NC subject to requirements of the Coastal Area Management
Act (CAMA). They include: Beaufort, Bertie, Brunswick, Camden, Carteret, Chowan,
Craven, Currituck, Dare, Gates, Hertford, Hyde, New Hanover, Onslow, Pamlico,
Pasquotank, Pender, Perquimans, Tyrrell and Washington.
Coastal Plain One of three major physiographic regions in North Carolina. Encompasses the eastern two-
fifths of state east of the fall line (approximated by Interstate I-95).
conductivity A measure of the ability of water to conduct an electrical current. It is dependent on the
concentration of dissolved ions such as sodium, chloride, nitrates, phosphates and metals in
solution.
DEH Department of Environmental Health
Appendix IX – Glossary of Terms and Acronyms 3

degradation The lowering of the physical, chemical or biological quality of a waterbody caused by
pollution or other sources of stress.
DENR Department of Environment and Natural Resources.
DHHS Department of Health and Human Services.
DO Dissolved oxygen.
drainage area An alternate name for a watershed.
DWQ North Carolina Division of Water Quality, an agency of DENR.
dystrophic Naturally acidic (low pH), "black-water" lakes which are rich in organic matter. Dystrophic
lakes usually have low productivity because most fish and aquatic plants are stressed by
low pH water. In North Carolina, dystrophic lakes are scattered throughout the Coastal
Plain and Sandhills regions and are often located in marshy areas or overlying peat
deposits. NCTSI scores are not appropriate for evaluating dystrophic lakes.
EEP Ecosystem Enhancement Program (EEP)
effluent The treated liquid discharged from a wastewater treatment plant.
EMC Environmental Management Commission.
EPA United States Environmental Protection Agency.
EPT Index This index is used to judge water quality based on the abundance and variety of three orders
of pollution sensitive aquatic insect larvae: Ephemeroptera (mayflies), Plecoptera
(stoneflies) and Trichoptera (caddisflies).
eutrophic Elevated biological productivity related to an abundance of available nutrients. Eutrophic
lakes may be so productive that the potential for water quality problems such as algal
blooms, nuisance aquatic plant growth and fish kills may occur.
eutrophication The process of physical, chemical or biological changes in a lake associated with nutrient,
organic matter and silt enrichment of a waterbody. The corresponding excessive algal
growth can deplete dissolved oxygen and threaten certain forms of aquatic life, cause
unsightly scums on the water surface and result in taste and odor problems.
fall line A geologic landscape feature that defines the line between the piedmont and coastal plain
regions. It is most evident as the last set of small rapids or rock outcroppings that occur on
rivers flowing from the piedmont to the coast.
FDA Unites States Food and Drug Administration.
GIS Geographic Information System. An organized collection of computer hardware, software,
geographic data and personnel designed to efficiently capture, store, update, manipulate,
analyze and display all forms of geographically referenced information.
habitat degradation Identified where there is a notable reduction in habitat diversity or change in habitat quality.
This term includes sedimentation, bank erosion, channelization, lack of riparian vegetation,
loss of pools or riffles, loss of woody habitat, and streambed scour.
headwaters Small streams that converge to form a larger stream in a watershed.
HQW High Quality Waters. A supplemental surface water classification.
HU Hydrologic unit. See definition below.
Hydrilla The genus name of an aquatic plant - often considered an aquatic weed.
hydrologic unit A watershed area defined by a national uniform hydrologic unit system that is sponsored by
the Water Resources Council. This system divides the country into 21 regions, 222
subregions, 352 accounting units and 2,149 cataloging units. A hierarchical code consisting
of two digits for each of the above four levels combined to form an eight-digit hydrologic
unit (cataloging unit). An eight-digit hydrologic unit generally covers an average of 975
Appendix IX – Glossary of Terms and Acronyms 4

square miles. There are 54 eight-digit hydrologic (or cataloging) units in North Carolina.
These units have been further subdivided into eleven and fourteen-digit units.
hypereutrophic Extremely elevated biological productivity related to excessive nutrient availability.
Hypereutrophic lakes exhibit frequent algal blooms, episodes of low dissolved oxygen or
periods when no oxygen is present in the water, fish kills and excessive aquatic plant
growth.
Impaired Term that applies to a water body that is not meeting the designated use criteria.
impervious Incapable of being penetrated by water; non-porous.
lbs Pounds. To change pounds to kilograms multiply by 0.4536.
loading Mass rate of addition of pollutants to a waterbody (e.g., kg/yr)
macroinvertebrates Animals large enough to be seen by the naked eye (macro) and lacking backbones
(invertebrate).
macrophyte An aquatic plant large enough to be seen by the naked eye.
mesotrophic Moderate biological productivity related to intermediate concentrations of available
nutrients. Mesotrophic lakes show little, if any, signs of water quality degradation while
supporting a good diversity of aquatic life.
MGD Million gallons per day.
mg/l Milligrams per liter (approximately 0.00013 oz/gal).
NCIBI North Carolina Index of Biotic Integrity. A measure of the community health of a
population of fish in a given waterbody.
NH3-N Ammonia nitrogen.
nonpoint source A source of water pollution generally associated with rainfall runoff or snowmelt. The
quality and rate of runoff of NPS pollution is strongly dependent on the type of land cover
and land use from which the rainfall runoff flows. For example, rainfall runoff from
forested lands will generally contain much less pollution and runoff more slowly than
runoff from urban lands.
NOV Notices of Violation. An NOV serve to alert the permittee of permit infractions and request
that whatever caused the violation be corrected immediately. Many times these will not
include a fine. Depending upon the severity of the violation, the permittee may receive a
Notice of Violation and Assessment of a Civil Penalty, which will include a fine.
NPDES National Pollutant Discharge Elimination System.
NPS Nonpoint source.
NR Not rated. A waterbody that is not rated for use support due to insufficient data.
NSW Nutrient Sensitive Waters. A supplemental surface water classification intended for waters
needing additional nutrient management due to their being subject to excessive growth of
microscopic or macroscopic vegetation. Waters classified as NSW include the Neuse, Tar-
Pamlico and Chowan River basins; the New River watershed in the White Oak basin; and
the watershed of B. Everett Jordan Reservoir (including the entire Haw River watershed).
NTU Nephelometric Turbidity Units. The units used to quantify turbidity using a turbidimeter.
This method is based on a comparison of the intensity of light scattered by the sample under
defined conditions with the intensity of the light scattered by a standard reference
suspension under the same conditions.
oligotrophic Low biological productivity related to very low concentrations of available nutrients.
Oligotrophic lakes in North Carolina are generally found in the mountain region or in
undisturbed (natural) watersheds and have very good water quality.
Appendix IX – Glossary of Terms and Acronyms 5

ORW Outstanding Resource Waters. A supplemental surface water classification intended to
protect unique and special resource waters having excellent water quality and being of
exceptional state or national ecological or recreational significance. No new or expanded
wastewater treatment plants are allowed, and there are associated stormwater runoff
controls enforced by DWQ.
PCBs Polychlorinated Biphenyls. PCBs are man-made chemicals that persist in the environment.
There are a number of adverse health effect associated with exposure to PCBs.
pH A measure of the concentration of free hydrogen ions on a scale ranging from 0 to 14.
Values below 7 and approaching 0 indicate increasing acidity, whereas values above 7 and
approaching 14 indicate a more basic solution.
phytoplankton Aquatic microscopic plant life, such as algae, that are common in ponds, lakes, rivers and
estuaries.
Piedmont One of three major physiographic regions in the state. Encompasses most of central North
Carolina from the Coastal Plain region (near I-95) to the eastern slope of the Blue Ridge
Mountains region.
riparian zone Vegetated corridor immediately adjacent to a stream or river. See also SMZ.
river basin The watershed of a major river system. North Carolina is divided into 17 major river
basins: Broad, Cape Fear, Catawba, Chowan, French Broad, Hiwassee, Little Tennessee,
Lumber, Neuse, New, Pasquotank, Roanoke, Savannah, Tar-Pamlico, Watauga, White Oak
and Yadkin River basins.
river system The main body of a river, its tributary streams and surface water impoundments.
runoff Rainfall that does not evaporate or infiltrate the ground, but instead flows across land and
into waterbodies.
SA Class SA Water Classification. This classification denotes saltwaters that have sufficient
water quality to support commercial shellfish harvesting.
SB Class SB Water Classification. This classification denotes saltwaters with sufficient water
quality for frequent and/or organized swimming or other human contact.
SC Class SC Water Classification. This classification denotes saltwaters with sufficient water
quality to support secondary recreation and aquatic life propagation and survival.
sedimentation The sinking and deposition of waterborne particles (e.g., eroded soil, algae and dead
organisms).
SOC Special Order by Consent. An agreement between the Environmental Management
Commission and a permitted discharger found responsible for causing or contributing to
surface water pollution. The SOC stipulates actions to be taken to alleviate the pollution
within a defined time. The SOC typically includes relaxation of permit limits for particular
parameters, while the facility completes the prescribed actions. SOCs are only issued to
facilities where the cause of pollution is not operational in nature (i.e., physical changes to
the wastewater treatment plant are necessary to achieve compliance).
streamside The area left along streams to protect streams from sediment and other pollutants, protect
management streambeds, and provide shade and woody debris for aquatic organisms.
zone (SMZ)
subbasin A designated subunit or subwatershed area of a major river basin. Subbasins typically
encompass the watersheds of significant streams or lakes within a river basin. Every river
basin is subdivided into subbasins ranging from one subbasin in the Watauga River basin to
24 subbasins in the Cape Fear River basin. There are 133 subbasins statewide. These
subbasins are not a part of the national uniform hydrologic unit system that is sponsored by
the Water Resources Council (see hydrologic unit).
Sw Swamp Waters. A supplemental surface water classification denoting waters that have
naturally occurring low pH, low dissolved oxygen and low velocities. These waters are
Appendix IX – Glossary of Terms and Acronyms 6

common in the Coastal Plain and are often naturally discolored giving rise to their
nickname of “blackwater” streams.
SWCD Soil and Water Conservation District
TMDL Total maximum daily load. The amount of a given pollutant that a waterbody can
assimilate and maintain its uses and water quality standards.
TN Total nitrogen.
TP Total phosphorus.
tributary A stream that flows into a larger stream, river or other waterbody.
trophic classification Trophic classification is a relative description of a lake's biological productivity, which is
the ability of the lake to support algal growth, fish populations and aquatic plants. The
productivity of a lake is determined by a number of chemical and physical characteristics,
including the availability of essential plant nutrients (nitrogen and phosphorus), algal
growth and the depth of light penetration. Lakes are classified according to productivity:
unproductive lakes are termed "oligotrophic"; moderately productive lakes are termed
"mesotrophic"; and very productive lakes are termed "eutrophic".
TSS Total Suspended Solids.
turbidity An expression of the optical property that causes light to be scattered and absorbed rather
than transmitted in straight lines through a sample. All particles in the water that may
scatter or absorb light are measured during this procedure. Suspended sediment, aquatic
organisms and organic particles such as pieces of leaves contribute to instream turbidity.
USGS United States Geological Survey
UT Unnamed tributary.
watershed The region, or land area, draining into a body of water (such as a creek, stream, river, pond,
lake, bay or sound). A watershed may vary in size from several acres for a small stream or
pond to thousands of square miles for a major river system. The watershed of a major river
system is referred to as a basin or river basin.
WET Whole effluent toxicity. The aggregate toxic effect of a wastewater measured directly by an
aquatic toxicity test.
WS Class WS Water Supply Water Classification. This classification denotes freshwaters used
as sources of water supply. There are five WS categories. These range from WS-I, which
provides the highest level of protection, to WS-V, which provides no categorical
restrictions on watershed development or wastewater discharges like WS-I through WS-IV.
WTP Water Treatment Plant
WWTP Wastewater treatment plant.

Appendix IX – Glossary of Terms and Acronyms 7

Appendix IX – Glossary of Terms and Acronyms 8