Section 12A-5 Definitions.
Prior to the adoption of Ord. 018164 on 07/19/2004, Section 12A-5 read as follows.
For the purposes of this chapter, the following words and phrases shall have
the meaning given
Agricultural activity. Normal farming operations including improvements
conducted under the
auspices of the
Soil Conservation Service Natural Resource Conservation Service.
City utility service customer. A purchaser of city water, electric, sewage
or refuse collection
Clean fill. Uncontaminated soil, rock, sand, gravel, concrete, asphaltic
brick, minimal amounts of wood and metal, and inert solids which are approved by rule or policy
of the State Department of Natural Resources for fill, reclamation or other beneficial use.
Clear cutting. The practice of removing over half of the standing
forest area on a site.
Climax forest. Any woodland community of over twenty thousand (20,000)
square feet which
is dominated by climax species such as oak, hickory, sugar maple or bottomland hardwoods such
as river birch, basswood, sycamore and hornbeam and which includes an area of five thousand
(5,000) square feet with a maximum aspect ratio of 4:1.
Critical downstream location. A location within the drainage reach downstream
of the subject
site, consisting of a channel section, drainage swale, bridge, box culvert, storm sewer, or other
conveyance facility or structure having a conveyance capacity which would be exceeded by
storm water runoff from a 10-year frequency, 24-hour duration storm under existing land use
conditions; or an existing structure or building located downstream of the subject site which has
its lowest floor elevation less than one (1) foot above the maximum elevation in an adjacent
channel attained by the 100-year frequency, 24-hour duration storm, assuming existing land use
conditions with the proposed ultimate development of the subject site in place. The conveyance
capacity of a structure operating under inlet control conditions shall be determined with a
maximum headwater to diameter ration (HW/D) of 1.25 or with a headwater elevation equal to
the top of curb, whichever is less.
dbh (diameter breast height). Trunk diameter at 4.5 feet about ground.
Design year storm. The selected or established frequency or return period
of rainfall time-duration for which drainage facilities are to be designed.
Developed land. Real estate altered by the addition of impervious surface
which changes the
hydrology of the property from its natural state.
Developer. A person whose intent or function is to bring about any change
of land use or
improvement on any parcel of land.
Development. Any change of land use or improvement on any parcel of land.
Director. The director of public works or his designee.
Drainage basin (or watershed). The catchment area from which storm water
is carried off by a watercourse or storm drainage
system. The area served by a drainage system receiving storm and other surface-borne water.
Drainage basin boundaries are a product of natural topography and drainage system
Drainage facility. A man-made structure or natural watercourse for the
conveyance of storm
runoff. Examples are channels, pipes, ditches, swales, catch basins, and street gutters.
Dwelling unit. A building or portion thereof, designed to house a family.
Forest land. Forested land area with the aerial canopy
dominated by trees greater than four (4)
inches in diameter, measured four and one-half (4 1/2) feet above the ground.
Forest parcel. An envelope of trees delineated by the boundaries of grading
limits or land
Impervious surface. A surface on real property where infiltration of
storm water into the earth
has been virtually eliminated by the works of man. Impervious surfaces shall include, but not be
limited to: Roofs, paved driveways, patio areas, sidewalks, parking lots, storage areas, and other
oil or macadam surfaced areas which prevent percolation of storm waters into the earth's surface.
Land disturbance. Any activity, including mechanized clearing, which
removes the vegetative
Land disturbance permit. A permit issued by the City of Columbia
that authorizes the
commencement of land disturbance activities or logging.
Logging. The removal of more than three (3) existing
trees for commercial purposes on any
tract of land larger than one (1) acre.
Main floor area. The area within the perimeter of the exterior walls
of a building excluding
any attached garage. The main floor area does not include the area of decks, porches, patios or
Maximum aspect ratio of 4:1. A means of defining the configuration of
an area of trees such that the measurement of length of
the area shall not be more than four (4) times as long as the measurement of width of the area.
Mechanized clearing. Clearing of land by tracked or wheeled vehicles
which scrape, cultivate
or scarify the surface of the ground exposing bare soil and uprooting vegetation.
Multiple-family building. A building with more than one dwelling unit.
Nonresidential use. The use of developed land for any purpose other than
for a single-family
residence or a multiple-family building.
Occupant. The person in possession or lawfully entitled to possession
of a parcel of land.
Owner. Any person having legal title to, or a proprietary interest in
real property. Proprietary
interest shall include, but not be limited to, estate administration, trusteeship, guardianship, and
actions under a valid power of attorney.
Peak runoff. The maximum rate at which storm water travels across the
surface of the ground.
Site. The total area of the parcel, tract, lot or ownership of land upon
which development or
land disturbance is proposed irrespective of the actual limits or size of the proposed development
or land disturbance activity.
Storm drain. A closed conduit or open ditch, natural or specifically
conducting or conveying collected storm water. Conduits and paved open ditches are termed
"improved"; unpaved ditches are termed "unimproved".
Storm drainage design manual. A City manual intended primarily for use
by land developers
in the design of minor storm drainage systems, such as a storm drains, relatively small culverts,
associated streets and gutter flow hydraulics, natural drainage swales, storm inlets and detention
facilities. The manual includes drainage policy to be followed, standard design methods,
computation forms, and City standards.
Storm drainage system. All drainage facilities used for collecting and
conducting storm water
to, through and from drainage areas to the points of final outlet including, but
not limited to, the following: Conduits and appurtenant features, canals, ditches, streams, gullies,
flumes, culverts, streets, gutters, and pump stations.
Swale. A wide shallow ditch used to carry storm runoff.
Tree. Any self-supporting woody perennial plant, usually with one (1)
main stem or trunk.
Tree, existing. A tree which meets or exceeds the following size standards:
trees shall have a four (4) inch
caliper diameter, measured four and one-half
(4 1/2) feet above
the ground and ornamental and evergreen species shall be a minimum of six (6) feet in height.
Unimproved land. Land or property having little or no "impervious
Watercourse. A stream, usually flowing in a particular direction (though
it need not flow
continuously in a definite channel), having a bed or banks and usually discharging into some
other stream or body of water.
Watershed. A drainage basin.
(Ord. No. 13019, § 1, 7-1-91; Ord. 13374, § 1, 7-20-92; Ord. No. 13590 § 1, 2-15-93;
14389 § 1, 3-6-95)