Specific terms or words used herein, unless otherwise expressly
stated, shall have the following meanings:
ACCELERATED EROSION
The removal of the surface of the land through the combined
action of man's activity and the natural processes at a rate greater
than would occur because of the natural processes alone.
ACCESS EASEMENT
A right granted by a landowner to a grantee, allowing entry
for the purpose of inspecting, maintaining and repairing SWM facilities.
ACT 167 PLAN
A plan prepared under the authority of Pennsylvania's Storm
Water Management Act of October 4, 1978, P.L. 864, No. 167, as amended
32 P.S. § 680.1 et seq., and as may be amended in the future.
AGRICULTURAL ACTIVITIES
The work of producing crops and raising livestock, including
tillage, plowing, disking, harrowing, pasturing and installation of
conservation measures. Construction of new buildings or impervious
areas is not considered an agricultural activity.
ALTERATION
As applied to land, a change in topography as a result of
the moving of soil and rock from one location or position to another;
the changing of surface conditions by causing the surface to be more
or less impervious; any land disturbance.
ANIMAL HEAVY-USE AREAS
A barnyard, feedlot, loading area, exercise lot, or other
similar area on an agricultural operation where, due to the concentration
of animals, it is not possible to establish and maintain vegetative
cover of a density capable of minimizing accelerated erosion and sedimentation
by usual planting methods. The term does not include entrances, pathways
and walkways between areas where animals are housed or kept in concentration.
APPLICANT
A landowner or developer who has filed an application for approval to engage in any regulated activities as defined in §
187-5 of this chapter.
BMP MANUAL
The Pennsylvania Storm Water Best Management Practices Manual,
as published by the Department of Environmental Protection (PADEP),
December 2006, or most-recent version thereof.
BMPs (BEST MANAGEMENT PRACTICES)
Activities, facilities, designs, measures, or procedures
used to manage stormwater impacts from regulated activities, to meet
state water quality requirements, to promote groundwater recharge,
and to otherwise meet the purposes of this chapter. Stormwater BMPs
are commonly grouped into one of two broad categories or measures:
"nonstructural" or "structural." "Nonstructural" BMPs are measures
referred to as operational and/or behavior-related practices that
attempt to minimize stormwater runoff generation resulting from an
alteration of the land surface or the contact of pollutants with stormwater
runoff, whereas "structural" BMPs are measures that consist of a physical
device or practice that is installed to capture and treat stormwater
runoff. "Structural" BMPs include, but are not limited to, a wide
variety of practices and devices, from large-scale wet ponds and constructed
wetlands, to small-scale underground treatment systems, infiltration
facilities, filter strips, low-impact design, bioretention, wet ponds,
permeable paving, grassed swales, riparian or forested buffers, sand
filters, detention basins, and manufactured devices. "Structural"
stormwater BMPs are permanent appurtenances to the project site.
BUILDING
Any enclosed or open structure, other than a boundary wall
or fence, occupying more than four square feet of area and/or having
a roof supported by columns, piers, or walls.
BOROUGH
The Borough of Manheim, Lancaster County, Pennsylvania.
CARBONATE GEOLOGY
Limestone or dolomite bedrock. Carbonate geology is often
associated with karst topography.
CHAPTER 102
Chapter 102 of the regulations of PADEP, 25 Pa. Code § 102.1
et seq. (Erosion and Sediment Control).
CHAPTER 105
Chapter
105 of the regulations of PADEP, 25 Pa. Code § 105.1 et seq. (Dam Safety and Waterway Management).
CHAPTER 106
Chapter 106 of the regulations of PADEP, 25 Pa. Code § 106.1
et seq. (Floodplain Management).
CISTERN
A reservoir or tank for storing rainwater.
CONSERVATION PLAN
A plan written by a National Resources Conservation Service
(or any agency successor thereto) certified planner that identifies
conservation practices and includes site-specific BMPs for agricultural
plowing or tilling activities and animal heavy-use areas.
CONVEYANCE
The ability of a pipe, culvert, swale or similar facility
to carry the peak flow from the design storm.
CULVERT
A structure with appurtenant works which carries a stream
under or through an embankment or fill.
DAM
An artificial barrier, together with its appurtenant works, constructed for the purpose of impounding or storing water or another fluid or semifluid, or a refuse bank, fill, or structure for highway, railroad, or other purposes which does or may impound water or another fluid or semifluid. The dam falls under the requirements of Chapter
105, Dam Safety and Waterway Management, if any of the following is true:
A.
The contributory drainage area exceeds 100 acres.
B.
The greatest depth of water measured by upstream toe of the
dam at maximum storage elevation exceeds 15 feet.
C.
The impounding capacity at maximum storage elevation exceeds
50 acre-feet.
DEP also PA DEP or PADEP
The Pennsylvania Department of Environmental Protection or
any agency successor to the Pennsylvania Department of Environmental
Protection.
DESIGNEE
The agent of the Manheim Borough Council involved with the
administration, review, or enforcement of any provisions of this chapter.
DESIGN STORM
The magnitude and temporal distribution of precipitation
from a storm event, measured in probability of occurrence (e.g., a
five-year storm) and duration (e.g., 24 hours), used in the design
and evaluation of stormwater management systems.
DETENTION BASIN
An impoundment structure designed to manage stormwater runoff
by temporarily storing the runoff and releasing it at a predetermined
rate.
DETENTION VOLUME
The volume of runoff that is captured and released into the
waters of this commonwealth at a controlled rate.
DEVELOPER
A person, partnership, association, corporation, or other
entity, or any responsible person therein or agent thereof, that undertakes
any regulated activity of this chapter.
DEVELOPMENT SITE
The specific area of land for which a regulated activity
is proposed, planned, conducted, or maintained.
DISAPPEARING STREAM
A stream in an area underlain by limestone or dolomite which
flows underground for a portion of its length.
DISCONNECTED IMPERVIOUS AREA (DIA)
An impervious or impermeable surface that is disconnected
from any stormwater drainage or conveyance system and is redirected
or directed to a pervious area, which allows for infiltration, filtration,
and increased time of concentration.
DISTURBED AREA
A land area where an earth disturbance activity is occurring
or has occurred.
DRAINAGE EASEMENT
A right granted by a landowner to a grantee, allowing the
use of private land for stormwater management, drainage, or conveyance
purposes.
E&S
Erosion and sediment.
EARTH DISTURBANCE ACTIVITY
A construction or other human activity which disturbs the
surface of the land, including, but not limited to, clearing and grubbing;
grading; excavations; embankments; land development; agricultural
plowing or tilling; operation of animal heavy-use areas; timber harvesting
activities; road maintenance activities; oil and gas activities; well
drilling; mineral extraction; building construction; and the moving,
depositing, stockpiling, or storing of soil, rock, or earth materials.
ENVIRONMENTALLY SENSITIVE AREA
Slopes greater than 15% shallow bedrock (located within six
feet of ground surface), wetlands, natural heritage areas and other
areas designated as conservation or preservation areas in Greenscapes,
the Green Infrastructure Element of the County Comprehensive Plan,
where encroachment by land development or land disturbance results
in degradation of the natural resource.
EPHEMERAL STREAM
A transient stream, one that flows for a relatively short
time.
EROSION
The movement of soil particles by the action of water, wind,
ice, or other natural forces.
EXISTING CONDITIONS
The initial condition of a project site prior to the proposed
regulated activity. If the initial condition of the site is not forested
or undeveloped land, the land use shall be considered as "meadow"
unless the natural land cover is documented to generate lower curve
numbers or Rational "C" coefficients, such as forested lands.
FACILITY DEPTH
For above-ground detention/retention/BMP facilities, the
facility depth is defined to be the depth between the bottom invert
of the lowest orifice and the invert of the spillway. If there is
no spillway, the top of the berm shall be used. For basins with no
orifices or outlet structure, the bottom elevation of the basin shall
be used.
FEMA
The Federal Emergency Management Agency or any agency successor
thereto.
FLOOD
A general but temporary condition of partial or complete
inundation of normally dry land areas from the overflow of streams,
rivers, and other waters of this commonwealth.
FLOOD FRINGE
That portion of the floodplain outside of the floodway.
FLOODPLAIN
Any land area susceptible to inundation by water from any
natural source or delineated by applicable Department of Housing and
Urban Development, Federal Insurance Administration, Flood Hazard
Boundary Maps as being a special flood hazard area; also, the area
of inundation which functions as a storage or holding area for floodwater
to a width required to contain a base flood of which there is a one-percent
chance of occurring in any given year. The floodplain contains both
the floodway and the flood fringe.
FLOOD PLAIN MANAGEMENT ACT
Act of October 4, 1978, P.L. 851, No. 166, as amended 32
P.S. § 679.101 et seq., and as may be amended in the future.
FLOODWAY
The channel of the watercourse and those portions of the
adjoining floodplains which are reasonably required to carry and discharge
the one-hundred-year frequency flood. Unless otherwise specified,
the boundary of the floodway is as indicated on maps and flood insurance
studies provided by FEMA. In an area where no FEMA maps or studies
have defined the boundary of the one-hundred-year frequency floodway,
it is assumed, absent evidence to the contrary, that the floodway
extends from the stream to 50 feet from the top of the bank of the
stream.
FOREST MANAGEMENT/TIMBER OPERATIONS
Planning and activities necessary for the management of forest
land. These include timber inventory; preparation of forest management
plans; silvicultural treatment; cutting budgets; logging road design
and construction; timber harvesting; site preparation; and reforestation.
FREEBOARD
A vertical distance between the one-hundred-year design elevation
of the water surface at the emergency spillway, in a condition that
assumes the primary outlet(s) are blocked, and the top of a dam, levee,
tank, basin, berm, or diversion ridge.
FREQUENCY
The probability or chance that a given storm event/flood
will be equaled or exceeded in a given year.
GRADE
A slope, usually of a road, channel, or natural ground, specified
in percent and shown on plans as specified herein.
GRASSED WATERWAY
A natural or constructed waterway, usually broad and shallow,
covered with erosion-resistant grasses, used to conduct surface water
from cropland.
GREEN INFRASTRUCTURE
Systems and practices that use or mimic natural processes
to infiltrate, evapotranspire, or reuse stormwater on the site where
it is generated.
[Added 9-13-2022 by Ord. No. 676]
HYDROLOGIC SOIL GROUP (HSG)
The classification of soils according to their runoff-producing
characteristics by NRCS. Soils are classified into four HSGs (A, B,
C, and D) according to their minimum infiltration rate, which is obtained
for bare soil after prolonged wetting. The NRCS defines the four groups
and provides a list of most of the soils in the United States and
their group classification. The soils in the area of the development
site may be identified from a soil survey report that can be obtained
from local NRCS offices or Conservation District offices. Soils become
less pervious as the HSG varies from A to D.
IMPERVIOUS SURFACE
A surface that prevents the infiltration of water into the
ground. Impervious surfaces (or areas) shall include, but are not
limited to, roofs, additional indoor living spaces, patios, garages,
storage sheds and similar structures, and any new streets and sidewalks.
Any surface area proposed to initially be gravel or crushed stone
shall be assumed to be impervious, unless designed and maintained
as an infiltration BMP. Decks, parking areas, and driveway areas are
not counted as impervious areas if they do not prevent infiltration.
IMPOUNDMENT
A retention or detention basin designed to retain stormwater
runoff and release it at a controlled rate.
INFILTRATION STRUCTURES
A structure designed to direct runoff into the ground (e.g.
French drains, seepage pits, infiltration trenches, rain gardens,
etc.).
INLET
A surface connection to a closed drain; a structure at the
diversion end of a conduit; the upstream end of any structure through
which water may flow.
KARST
A type of topography or landscape characterized by features
including, but not limited to, surface depressions, sinkholes, rock
pinnacles/uneven bedrock surface, underground drainage, and caves.
Karst is formed on carbonate rocks, such as limestone or dolomite.
LAND DEVELOPMENT
Any of the following activities:
A.
The improvement of one lot or two or more contiguous lots, tracts,
or parcels of land for any purpose involving:
(1)
A group of two or more residential or nonresidential buildings,
whether proposed initially or cumulatively, or a single nonresidential
building on a lot or lots regardless of the number of occupants or
tenure; or
(2)
The division or allocation of land or space, whether initially
or cumulatively, between or among two or more existing or prospective
occupants by means of, or for the purpose of, streets, common areas,
leaseholds, condominiums, building groups, or other features.
C.
Development in accordance with Section 503 (1.1) of the Pennsylvania
Municipalities Planning Code.
LAND DISTURBANCE
Any activity involving grading, tilling, digging, or filling
of ground or stripping of vegetation or any other activity that causes
an alteration to the condition of the land; the erection of a dwelling
or other structure; or the modification, removal, filling, or alteration
of an existing stormwater management facility or drainage easement.
Land disturbance activities shall be classified as follows:
A.
Major land disturbance activity:
(1)
Any use requiring the submission of a subdivision or land development
plan, as herein defined;
(2)
Any land disturbance not defined as a minor land disturbance
activity or deemed to qualify as a minor land disturbance activity
by the Borough;
(3)
Any use involving the diversion or piping of any natural or
man-made watercourse or existing drainage pattern;
(4)
Any use involving the installation of ground cover, grading,
filing, excavation, or disturbance of woodland in excess of one acre,
except for the use of land for agricultural plowing and tilling and
the science of forestry when operated in accordance with approved
conservation and erosion control practices.
B.
Minor land disturbance activity:
(1)
The use of land on an existing lot of record, including subdivided
lots or land developments approved under a major land disturbance
activity, provided that:
(a)
The use is not within a floodplain area;
(b)
No diversion or piping of any natural or man-made watercourse
or existing drainage pattern is involved;
(c)
The use creates impervious areas of more than 1,000 square feet
and less than 5,000 square feet and/or involves the removal of ground
cover, grading, filling, or excavation of an area less than 5,000
square feet, either of which shall be measured on a cumulative basis
from July 29, 2014;
[Amended 9-13-2022 by Ord. No. 676]
(d)
The use does not require the submission of a subdivision or
land development plan, as herein defined.
(2)
Any use of the land which, in the opinion of the Borough, represents
minimal ground disturbance or impact to the environment.
LANDOWNER
The legal or beneficial owner or owners of land, including
the holder of an option or contract to purchase (whether or not such
option or contract is subject to any condition), a lessee if he is
authorized under the lease to exercise the rights of the landowner,
or other person having a proprietary interest in land.
LIMITING ZONE
A rock formation, other stratum, or soil condition which
is so slowly permeable that it effectively limits downward passage
of effluent. Seasonal high-water tables, whether perched or regional,
also constitute a limiting zone.
LINEAMENT
A fracture on the order of tens of kilometers long, usually
extending to the basement below sedimentary rock.
LOW-IMPACT DEVELOPMENT (LID)
Site design approaches and small-scale stormwater management
practices that promote the use of natural systems for infiltration,
evapotranspiration, and reuse of rainwater. LID can be applied to
new development, urban retrofits, and revitalization projects. LID
utilizes design techniques that infiltrate, filter, evaporate, and
store runoff close to its source. Rather than rely on costly large-scale
conveyance and treatment systems, LID addresses stormwater through
a variety of small, cost-effective landscape features located on-site.
[Added 9-13-2022 by Ord. No. 676]
MANNING EQUATION (MANNING FORMULA)
A method for calculation of velocity of flow (e.g., feet
per second) and flow rate (e.g., cubic feet per second) in open channels
based upon channel shape, roughness, depth of flow, and slope. "Open
channels" may include closed conduits so long as the flow is not under
pressure.
MAXIMUM EXTENT PRACTICABLE (MEP)
Applies when the applicant demonstrates to the Borough's
satisfaction that the performance standard is not achievable. The
applicant shall take into account the best available technology, cost
effectiveness, geographic features, and other competing interests,
such as protection of human safety and welfare, protection of endangered
and threatened resources, and preservation of historic properties,
in making the assertion that the performance standard cannot be met
and that a different means of control is appropriate.
MUNICIPALITIES PLANNING CODE (MPC)
The Pennsylvania Municipalities Planning Code, Act of July
1, 1967, P.L. 805, No. 247, as reenacted and amended, 53 P.S. § 10101
et seq., and as may be amended in the future.
MUNICIPAL SEPARATE STORM SEWER
A conveyance or system of conveyances (including roads with
drainage systems, municipal streets, catch basins, curbs, gutters,
ditches, man-made channels, or storm drains), which is all of the
following:
A.
Owned or operated by a state, city, town, borough, county, district,
association or other public body (created under state law) having
jurisdiction over disposal of sewage, industrial wastes, stormwater
or other wastes;
B.
Designed or used for collecting or conveying stormwater;
C.
Not a combined sewer; and
D.
Not part of a publicly owned treatment works, as defined at
40 CFR 122.2.
MUNICIPAL SEPARATE STORM SEWER SYSTEM (MS4)
All separate storm sewers that are defined as "large" or
"medium" or "small" municipal separate storm sewer systems pursuant
to 40 CFR 122.26(b)(18), or designated as regulated under 40 CFR 122.26(a)(1)(v).
NATURAL GROUND COVER
Ground cover which mimics the infiltration characteristics
of the predominant hydrologic soil group found at the site.
NOAA ATLAS 14
The Precipitation-Frequency Atlas of the United States, Atlas
14, Volume 2, United States Department of Commerce, National Oceanic
and Atmospheric Administration, National Weather Service, Hydrometeorological
Design Studies Center, Silver Spring, Maryland (2004). NOAA's Atlas
14, United States can be accessed at Internet address: http://hdsc.nws.noaa.gov/hdsc/pfds/
(as may be revised from time to time).
[Amended 9-13-2022 by Ord. No. 676]
OPEN CHANNEL
A stormwater management element in which stormwater flows
with an open surface. Open channels include, but shall not be limited
to, natural and man-made drainageways, swales, streams, ditches, canals,
and pipes flowing partly full.
OUTFALL
A.
A point where water flows from a conduit, stream, or drain;
B.
"Point source," as described in 40 CFR 122.2, at the point where
the municipal separate storm sewer system discharges to surface waters
of this commonwealth.
OUTLET
Points of water disposal from a stream, river, lake, tidewater
or artificial drain.
PARENT TRACT
All contiguous land held in single and separate ownership,
regardless of whether: such land is divided into one or more lots,
parcels, purparts, or tracts; such land was acquired by the landowner
at different times or by different deeds, devise, partition, or otherwise;
or such land is bisected by public or private streets or rights-of-way,
which was held by the landowner or his predecessor in title on the
effective date of this chapter. "Single and separate ownership" is
the ownership of property by any person, partnership, or corporation,
in which ownership is separate and distinct from that of any adjoining
property.
PEAK DISCHARGE
The maximum rate of stormwater runoff from a specific storm
event.
PennDOT
The Pennsylvania Department of Transportation, or any agency
successor thereto.
PERVIOUS AREA
Any material/surface that allows water to pass through at
a rate equal to or greater than natural ground cover.
PIPE
A culvert, closed conduit, or similar structure (including
appurtenances) that conveys stormwater.
PLAN
The stormwater management and erosion and sediment pollution
control plans and narratives.
PLANNING COMMISSION
The Planning Commission of Manheim Borough, Lancaster County,
Pennsylvania.
PROCESS WASTEWATER
Water that comes in contact with any raw material, product,
by-product, or waste during any production or industrial process.
PROJECT SITE
The specific area of land where any regulated activities
in the Borough are planned, conducted, or maintained.
QUALIFIED PERSON
Any person licensed by the Pennsylvania Department of State
or otherwise qualified by law to perform the work required by this
chapter.
RATE CONTROL
SWM controls used to manage the peak flows for the purposes
of channel protection and flood mitigation.
RECORD PLAN
Where a regulated activity constitutes a subdivision or land
development, the final subdivision or land development plan which
contains the information the ordinance requires; where a regulated
activity does not constitute a subdivision or land development, a
stormwater management site plan containing all required information
and prepared in a form acceptable to the office of the Recorder of
Deeds for recording.
REGIONAL STORMWATER MANAGEMENT PLAN
A plan to manage stormwater runoff from an area larger than
a single development site. A regional stormwater management plan could
include two adjacent parcels, an entire watershed, or some defined
area in between. Regional stormwater management plans can be prepared
for new development or as a retrofit to manage runoff from already
developed areas.
REGULATED ACTIVITIES
Any earth disturbance activities or any activities that involve the alteration or development of land in a manner that may affect stormwater runoff and that are specified in §
187-5 of this chapter.
RELEASE RATE
The percentage of predevelopment peak rate of runoff from
a site or subwatershed area to which the post-development peak rate
of runoff must be reduced to protect downstream areas.
RELEASE RATE MAP
A graphical representation of the release rates for a specific
area.
RETENTION BASIN
An impoundment in which stormwater is stored and not released
during the storm event. Stored water may be released from the basin
at some time after the end of the storm.
RETENTION VOLUME/REMOVED RUNOFF
The volume of runoff that is captured and not released directly
into the surface waters of this commonwealth during or after a storm
event.
RETURN PERIOD
The average interval, in years, within which a storm event
of a given magnitude can be expected to recur. For example, the twenty-five-year
return period rainfall would be expected to recur on the average once
every 25 years, or, stated in another way, the probability of a twenty-five-year
storm occurring in any one year is 0.04 (i.e., a four-percent chance).
RIPARIAN BUFFER
A vegetated area bordering perennial and intermittent streams
and wetlands that serves as a protective filter to help protect streams
and wetlands from the impacts of adjacent land uses.
RIPARIAN FOREST BUFFER
A type of riparian buffer that consists of permanent vegetation
that is predominantly native trees, shrubs and forbs along a watercourse
that is maintained in a natural state or sustainably managed to protect
and enhance water quality, stabilize stream channels and banks, and
separate land use activities from surface waters.
RISER
A vertical pipe extending from the bottom of a pond that
is used to control the discharge rate from the pond for a specified
design storm.
RUNOFF
Any part of precipitation that flows over the land surface.
SEDIMENT
Soils or other materials transported by surface water as
a product of erosion.
SEDIMENTATION
The process by which mineral or organic matter is accumulated
or deposited by the movement of water.
SEDIMENT BASIN
A barrier, dam, or retention or detention basin located and
designed to retain rock, sand, gravel, silt, or other material transported
by water.
SEDIMENT POLLUTION
The placement, discharge, or any other introduction of sediment
into the waters of the commonwealth occurring from the failure to
design, construct, implement or maintain control measures and control
facilities in accordance with the requirements of this chapter.
SEEPAGE PIT/SEEPAGE TRENCH
An area of excavated earth filled with clean, loose stone
or similar coarse material into which surface water is directed for
infiltration into the ground.
SHEET FLOW
Runoff which flows over the ground surface as a thin, even
layer, not concentrated in a channel.
SOIL-COVER-COMPLEX METHOD
A method of runoff computation developed by the SCS (now
NRCS) that is based on relating soil type and land use/cover to a
runoff parameter called "curve number (CN)."
SOIL HORIZON
A layer of soil or soil material approximately parallel to
the land surface and differing from adjacent genetically related layers
in physical, chemical, and biological properties or characteristics
such as color, structure, texture, consistency, kinds and number of
organisms present, degree of acidity or alkalinity, etc.
SPILLWAY
A depression in the embankment of a pond or basin which is
used to pass peak discharge greater than the maximum design storm
controlled by the pond.
STATE WATER QUALITY REQUIREMENTS
The regulatory requirements to protect, maintain, reclaim,
and restore water quality under Title 25 of the Pennsylvania Code,
the Clean Streams Law and the Clean Water Act.
STORAGE
A volume above or below ground that is available to hold
stormwater.
STORAGE INDICATION METHOD
A reservoir routing procedure based on solution of the continuity
equation (inflow minus outflow equals the change in storage), with
outflow defined as a function of storage volume and depth.
STORM EVENT
A storm of a specific duration, intensity, and frequency.
STORM FREQUENCY
The number of times that a given storm "event" occurs or
is exceeded on the average in a stated period of years. See "return
period."
STORM SEWER
A system of pipes and/or open channels that conveys intercepted
runoff and stormwater from other sources but excludes domestic sewage
and industrial wastes.
STORMWATER
Drainage runoff from the surface of the land resulting from
precipitation or snow or ice melt.
STORM WATER MANAGEMENT ACT
Act of October 4, 1978, P.L. 864, No. 167, as amended 32
P.S. § 680.1 et seq., and as may be amended in the future.
STORMWATER MANAGEMENT FACILITY
Any structure, natural or man-made, that, due to its condition,
design, or construction, conveys, stores, or otherwise affects stormwater
runoff. Typical stormwater management facilities include, but are
not limited to, detention and retention basins, open channels, road
gutters, swales, storm sewers, pipes, BMPs, and infiltration structures.
STORMWATER MANAGEMENT PLAN
The "Countywide Act 167 Plan" for Lancaster County for managing
stormwater runoff adopted by Lancaster County as required by the Act
of October 4, 1978, 32 P.S., P.L. 864, (Act 167) as amended, and known
as the "Storm Water Management Act."
STORMWATER MANAGEMENT SITE PLAN
The plan prepared by the developer or his representative
indicating how stormwater runoff will be managed at the particular
site of interest according to this chapter.
SUBDIVISION
The division or redivision of a lot, tract, or parcel of
land by any means into two or more lots, tracts, parcels, or other
divisions of land, including changes in existing lot lines for the
purpose, whether immediate or future, of lease, partition by the court
for distribution to heirs or devisees, transfer of ownership, or building
or lot development; provided, however, that the subdivision by lease
of land for agricultural purposes into parcels of more than 10 acres,
not involving any new street or easement of access or any residential
dwelling, shall be exempted.
SUBWATERSHED AREA
The smallest drainage unit of a watershed for which stormwater
management criteria have been established in the stormwater management
plan.
SWALE
A low-lying stretch of land which gathers or carries surface
water runoff.
SWM
Stormwater management.
TIME OF CONCENTRATION (Tc)
The time for surface runoff to travel from the hydraulically
most-distant point of the watershed to a point of interest within
the watershed. This time is the combined total of overland flow time
and flow time in pipes or channels, if any.
USDA
The United States Department of Agriculture or any agency
successor thereto.
WATERCOURSE
A stream of water, river, brook, creek, or a channel or ditch
for water, whether natural or man-made, having a defined bed and banks,
with perennial or intermittent flow.
WATERSHED
The entire region or area drained by a watercourse.
WATERS OF THIS COMMONWEALTH
Any and all rivers, streams, creeks, rivulets, ditches, watercourses,
storm sewers, lakes, dammed water, wetlands, ponds, springs, and all
other bodies or channels of conveyance of surface and underground
water, or parts thereof, whether natural or artificial, within or
on the boundaries of this commonwealth.
WETLAND
Those areas that are inundated or saturated by surface water
or groundwater at a frequency and duration sufficient to support,
and that under normal circumstances do support, a prevalence of vegetation
typically adapted for life in saturated soil conditions, including
swamps, marshes, bogs, fens, and similar areas. The term includes,
but is not limited to, wetland areas listed in the State Water Plan,
the United States Forest Service Wetlands Inventory of Pennsylvania,
the Pennsylvania Coastal Zone Management Plan and a wetland area designated
by a river basin commission. This definition is used by the United
States Environmental Protection Agency (USEPA) and the United States
Army Corps of Engineers (USACOE).