A.
For the purposes of this chapter, certain terms and words used herein
shall be interpreted as follows:
(1)
Words used in the present tense include the future tense; the singular
number includes the plural, and the plural number includes the singular;
words of masculine gender include feminine gender; and words of feminine
gender include masculine gender.
(2)
The word "includes" or "including" shall not limit the term to the
specific example but is intended to extend its meaning to all other
instances of like kind and character.
(3)
The words "shall" and "must" are mandatory; the words "may" and "should"
are permissive.
B.
ACCESS EASEMENT
ACT 167 PLAN
AGRICULTURAL ACTIVITY
AGRICULTURE
ALTERATION
ANIMAL HEAVY USE AREAS
APPLICANT
BEST MANAGEMENT PRACTICE (BMP)
BMP MANUAL
BOARD OF SUPERVISORS
BUILDING
CARBONATE GEOLOGY (OR CARBONATE ROCK FORMATIONS)
CFS
CHANNEL
CHAPTER 102
CHAPTER 105
CHAPTER 106
CISTERN
CLEAN WATER ACT
CN
CONESTOGA RIVER ACT 167 PLAN
CONSERVATION DISTRICT
CONSERVATION PLAN
CONSERVATION PRACTICES
CONVEYANCE
CULVERT
DAM
DEP
DEP also PA DEP or PADEP
DESIGN STORM
DESIGNEE
DETENTION (or TO DETAIN)
DETENTION BASIN
DETENTION VOLUME
DEVELOPER
DEVELOPMENT
DEVELOPMENT SITE (SITE)
DIAMETER AT BREAST HEIGHT (DBH)
DISAPPEARING STREAM
DISTURBED AREA
DOWNSLOPE PROPERTY LINE
DRAINAGE AREA
DRAINAGE CONVEYANCE FACILITY
DRAINAGE EASEMENT
DRAINAGE PERMIT
E&S
E&S PLAN (ALSO EROSION AND SEDIMENT CONTROL PLAN)
EARTH DISTURBANCE (or EARTH DISTURBANCE ACTIVITY)
EASEMENT
ENGINEER
ENVIRONMENTALLY SENSITIVE AREA
EPHEMERAL STREAM
EROSION
EROSION AND SEDIMENT CONTROL PLAN
EXISTING CONDITION
FEMA
FLOOD
FLOOD FRINGE
FLOODPLAIN
FLOODWAY
FLOOR ELEVATION
FOREST MANAGEMENT/TIMBER OPERATIONS
FREEBOARD
FREQUENCY
GRADE
GRASSED WATERWAY
GREEN INFRASTRUCTURE
HEC-1
HEC-HMS — The U.S. Army Corps of Engineers, Hydrologic
Engineering Center (HEC)
HIGH TUNNEL
(1)
(2)
HOTSPOTS
HYDROLOGIC SOIL GROUP (HSG)
IMPERVIOUS SURFACE (IMPERVIOUS AREA)
IMPOUNDMENT
INFILTRATION
INFILTRATION FACILITY
INFILTRATION STRUCTURES
INLET
INTERMITTENT
INTERMITTENT STREAM
INVASIVE VEGETATION (INVASIVES)
INVERT
KARST
LAND DEVELOPMENT (DEVELOPMENT)
(1)
(a)
(b)
(2)
(3)
LAND DISTURBANCE
LAND DISTURBANCE ACTIVITY
(1)
(a)
(b)
(c)
LANDOWNER
LICENSED PROFESSIONAL
LIMITING ZONE
(1)
(2)
(3)
LINEAMENT
LOW-IMPACT DEVELOPMENT (LID)
MAIN STEM (MAIN CHANNEL)
MAINTENANCE
MANNING'S EQUATION
MAXIMUM EXTENT PRACTICABLE (MEP)
MEMORANDUM OF UNDERSTANDING
MILL CREEK ACT 167 PLAN
MPC
MUNICIPAL ENGINEER
MUNICIPAL SEPARATE STORM SEWER (MS3)
(1)
(2)
(3)
(4)
MUNICIPAL SEPARATE STORM SEWER SYSTEM (MS4)
MUNICIPALITY
MUNICIPALITY
NATIVE VEGETATION
NATURAL DRAINAGEWAY
NATURAL GROUND COVER
NEW DEVELOPMENT
NOAA
NONPOINT SOURCE POLLUTION
NONSTORMWATER DISCHARGES
NONSTRUCTURAL BEST MANAGEMENT PRACTICE (BMPs)
NPDES
NRCS
OPEN CHANNEL
PADEP
PARENT TRACT
PEAK DISCHARGE
PENNDOT
PENNSYLVANIA STORMWATER BEST MANAGEMENT PRACTICES MANUAL (PA
BMP MANUAL)
PERVIOUS AREA (OR PERVIOUS SURFACE)
PIPE
PLANNING COMMISSION
PLANS
PMF-PROBABLE MAXIMUM FLOOD
POINT SOURCE
POST-CONSTRUCTION (POSTDEVELOPMENT)
PREDEVELOPMENT (PRE-CONSTRUCTION)
PRETREATMENT
PROCESS WASTEWATER
PROJECT SITE
PROPOSED IMPERVIOUS SURFACE
QUALIFIED PROFESSIONAL
RAINFALL INTENSITY
RECHARGE
RECORD PLAN
REDEVELOPMENT
REGIONAL STORMWATER MANAGEMENT PLAN
REGULATED ACTIVITIES
REGULATED EARTH DISTURBANCE ACTIVITY
REGULATED IMPERVIOUS SURFACE
RELEASE RATE
RELEASE RATE MAP
RETENTION (OR TO RETAIN)
RETENTION BASIN
RETENTION VOLUME/REMOVED RUNOFF
RETURN PERIOD
RIPARIAN
RIPARIAN BUFFER
RIPARIAN CORRIDOR
RIPARIAN CORRIDOR EASEMENT
RIPARIAN FOREST BUFFER
RISER
ROOFTOP DETENTION
RUNOFF
SALDO
SCS
SEDIMENT
SEDIMENT BASIN
SEDIMENT POLLUTION
SEDIMENTATION
SEEPAGE PIT/SEEPAGE TRENCH
SEMI-IMPERVIOUS/SEMI-PERVIOUS SURFACE
SEPARATE STORM SEWER SYSTEM
SHEET FLOW
SITE
SMALL PROJECT
(1)
(2)
(3)
SMALL STORM EVENT
SOIL COVER COMPLEX METHOD
SPILLWAY
STATE WATER QUALITY REQUIREMENTS
STORAGE
STORAGE INDICATION METHOD
STORM FREQUENCY
STORMWATER
STORMWATER MANAGEMENT
STORMWATER MANAGEMENT (SWM) SITE PLAN
STORMWATER MANAGEMENT ACT
STORMWATER MANAGEMENT FACILITY
STREAM
STREAM ENCLOSURE
STRUCTURAL BMPs
STRUCTURE
SUBDIVISION
SUBDIVISION AND LAND DEVELOPMENT ORDINANCE
SUBWATERSHED
SUBWATERSHED AREA
SWALE
SWM
SWM SITE PLAN
TIMBER OPERATIONS
TIME OF CONCENTRATION (TC)
TOP-OF-BANK
TOWNSHIP
TR-20 (CALIBRATED)
TREATMENT TRAIN
USDA
VOLUME CONTROL
WATER TABLE
WATERCOURSE
WATERS OF THIS COMMONWEALTH
WATERSHED
WETLAND
WOODS
These definitions do not necessarily reflect the definitions contained
in pertinent regulations or statutes, and are intended for this chapter
only.
A right granted by a landowner to a grantee, allowing entry
for the purpose of inspecting, maintaining and repairing SWM Facilities.
A plan prepared under the authority of Pennsylvania's
Stormwater Management Act of October 4, 1978.[1]
Activities associated with agriculture such as agricultural
cultivation, agricultural operation, and animal heavy use areas. This
includes the work of producing crops including tillage, land clearing,
plowing, disking, harrowing, planting, harvesting crops or pasturing
and raising of livestock and installation of conservation measures.
Construction of new buildings or impervious area is not considered
an agricultural activity.
The cultivation of the soil and the raising and harvesting
of the products of the soil, including but not limited to nursery,
horticulture, forestry and animal husbandry activities.
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;
also the changing of surface conditions by causing the surface to
be more or less impervious; earth disturbance activity.
A barnyard, feedlot, loafing 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.
A landowner, developer, or other person who has filed an
application to the municipality for approval to engage in any regulated
activity at a project site in the municipality.
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:
"structural" or "nonstructural." In this chapter, nonstructural BMPs
or measures refer to operational and/or behavior-related practices
that attempt to minimize the contact of pollutants with stormwater
runoff, whereas structural BMPs or measures are those 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 retention
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.
The Pennsylvania Stormwater Best Management Practices Manual
of December 2006, or most recent version thereof.
The Board of Supervisors of East Earl Township, Lancaster
County, Pennsylvania.
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.
See "karst."
Cubic feet per second.
A natural or artificial open drainage feature that conveys,
continuously or periodically, flowing water and through which stormwater
flows. Channels include, but shall not be limited to, natural and
man-made drainageways, swales, streams, ditches, canals, and pipes
flowing partly full.
25 Pa. Code Chapter 102, Erosion and Sediment Control.
25 Pa. Code, Chapter 105, Dam Safety and Waterway Management.
25 Pa. Code, Chapter 106, Floodplain Management.
A reservoir or tank for storing rainwater.
The 1972 Amendments to the Federal Water Pollution Control
Act, P.L. 92-500 of 1972, 33 U.S.C. § 1251 et seq.
Curve number.
The Conestoga River Watershed Storm Water Management Plan
as approved by PaDEP.
A conservation district, as defined in Section 3(c) of the
conservation district Law [3 P. S. § 851(c)] that has the
authority under a delegation agreement executed with DEP to administer
and enforce all or a portion of the regulations promulgated under
25 Pa. Code 102.
A plan written by an NRCS certified planner that identifies
conservation practices and includes site specific BMPs for agricultural
plowing or tilling activities and animal heavy use areas.
Practices installed on agricultural lands to improve farmland,
soil and/or water quality which have been identified in a current
conservation plan.
A natural or manmade, existing or proposed stormwater management
facility, feature or channel used for the transportation or transmission
of stormwater from one place to another. For the purposes of this
chapter, conveyance shall include pipes, drainage ditches, channels
and swales (vegetated and other), gutters, stream channels, and like
facilities or features.
A structure with appurtenant works which can convey a stream
under or through an embankment or fill.
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 the following is true;
The Pennsylvania Department of Environmental Protection.
The Pennsylvania Department of Environmental Protection or
any agency successor to the Pennsylvania Department of Environmental
Protection.
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. Also see "return
period."
The agent of a municipal governing body involved with the
administration, review or enforcement of any provisions of this chapter
by contract or memorandum of understanding.
Capture and temporary storage of runoff in a stormwater management
facility for release at a controlled rate.
An impoundment designed to collect and retard stormwater
runoff by temporarily storing the runoff and releasing it at a predetermined
rate. Detention basins are designed to drain completely shortly after
any given rainfall event.
The volume of runoff that is captured and released into the
Waters of the Commonwealth at a controlled rate.
A person who seeks to undertake any regulated activities
at a site in the municipality.
Any man-made change to improved or unimproved real estate,
including but not limited to buildings or other structures, mining,
dredging, filling, grading, paving, excavation, or drilling operations.
See Project site.
The outside bark diameter of a tree at breast height which
is defined as 4 1/2 feet (1.37 m) above the forest floor and/or
ground on the uphill side of the tree.
A stream in an area underlain by limestone or dolomite that
flows underground for a portion of its length.
An unstabilized land area where an earth disturbance activity
is occurring or has occurred.
That portion of a property line of a parent tract located
at the topographically lowest point of the parent tract such that
some or all overland, swale, or pipe flow from a development site
would be directed toward it.
That land area contributing runoff to a single point (including
but not limited to the point/line of interest used for hydrologic
and hydraulic calculations) and that is enclosed by a natural or man-made
ridge line.
A storm water management facility designed to transmit storm
water runoff and shall include streams, channels, swales, pipes, conduits,
storm sewers, etc.
Rights to occupy and use another person's real property
for the installation and operation of stormwater management facilities,
or for the maintenance of natural drainageways to preserve and maintain
a channel for the flow of stormwater therein, or to safeguard health,
safety, property, and facilities.
A permit issued by the Township governing body after the
storm water management site plan has been approved. Said permit is
issued prior to or with the final Township approval.
Erosion and sediment.
A site-specific plan consisting of both drawings and a narrative
that identifies BMPs to minimize accelerated erosion and sedimentation
before, during and after earth disturbance activities.
A construction or other human activity which disturbs the
surface of the land, including, but not limited to: clearing and grubbing;
grading; excavations; embankments; road maintenance; building construction;
and the moving, depositing, stockpiling, or storing of soil, rock,
or earth materials.
A right of use granted by a landowner to allow a grantee
the use of the designated portion of land for a specified purpose,
such as for stormwater management or other drainage purposes.
A professional engineer licensed by the Commonwealth of Pennsylvania.
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 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.
A transient stream, one that flows for a relatively short
time.
The natural process by which the surface of the land is worn
away by water, wind, or chemical action.
A plan required by the conservation district or the municipality
to minimize accelerated erosion and sedimentation, and that must be
prepared and approved per the applicable requirements.
The dominant land cover during the five-year period immediately
preceding a proposed regulated activity.
Federal Emergency Management Agency.
A temporary condition of partial or complete inundation of
land areas from the overflow of streams, rivers, and other waters
of this commonwealth.
That portion of the floodplain outside of the floodway,
Any land area susceptible to inundation by water from any
natural source or delineated by applicable FEMA maps and studies as
being a special flood hazard area. Also includes areas that comprise
Group 13 Soils, as listed in Appendix A of the Pennsylvania DEP Technical
Manual for Sewage Enforcement Officers (as amended or replaced from
time to time by DEP).
The channel of the watercourse and those portions of the
adjoining floodplains that are reasonably required to carry and discharge
the 100-year 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 100-year floodway, it is presumed, absent evidence
to the contrary, that the floodway extends from the stream to 50 feet
from the top of the bank of the stream.
The elevation of the lowest level of a particular building,
including the basement.
Planning and activities necessary for the management of forestland.
These include conducting a timber inventory, preparation of forest
management plans, silvicultural treatment, cutting budgets, logging
road design and construction, timber harvesting, site preparation,
and reforestation.
A vertical distance between the design high-water elevation
and the elevation of the top of a dam, levee, tank, basin, swale,
or diversion berm. The space is required as a safety margin in a pond
or basin.
The probability or chance that a given storm event/flood
will be equaled or exceeded in a given year.
(n) A slope, usually of a road, channel or natural ground
specified in percent and shown on plans as specified herein. (v) To
finish the surface of a roadbed, top of embankment or bottom of excavation.
A natural or constructed waterway, usually broad and shallow,
covered with erosion-resistant grasses, used to conduct surface water
from cropland.
Systems and practices that use or mimic natural processes
to infiltrate, evapotranspire, or reuse stormwater on the site where
it is generated.
The U.S. Army Corps of Engineers, Hydrologic Engineering
Center (HEC) hydrologic runoff model.
Hydrologic Modeling System (HMS).
A structure which meets the following:
Is used for the production, processing, keeping, storing, sale
or shelter of an agricultural commodity as defined in section 2 of
the Act of December 19, 1974 (P.L. 973, No. 319), known as the "Pennsylvania
Farmland and Forest Land Assessment Act of 1974," or for the storage
of agricultural equipment or supplies; and
Areas where prior or existing land use or activities can
potentially generate highly contaminated runoff with concentrations
of pollutants in excess of those typically found in stormwater.
Infiltration rates of soils vary widely and are affected
by subsurface permeability as well as surface intake rates. 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 (NRCS).
A surface that prevents the infiltration of water into the
ground. Impervious surfaces (or areas) shall include, but not be limited
to: roofs; additional indoor living spaces, patios, garages, storage
sheds and similar structures; and any new streets or sidewalks. For
the purposes of determining compliance with this chapter; decks, pools,
and compacted soils or stone surfaces used for vehicle parking and
movement shall be considered impervious.
A retention or detention facility designed to retain stormwater
runoff and infiltrate it into the ground (in the case of a retention
basin) or release it at a controlled rate (in the case of a detention
basin).
Movement of surface water into the soil, where it is absorbed
by plant roots, evaporated into the atmosphere, or percolated downward
to recharge groundwater.
A stormwater BMP designed to collect and discharge runoff
into the subsurface in a manner that allows infiltration into underlying
soils and groundwater (e.g., French drains, seepage pits, or seepage
trenches, etc.).
A structure designed to direct runoff into the ground (e.g.,
French drains, seepage pits, seepage trench, rain gardens, vegetated
swales, pervious paving, infiltration basins, etc.).
A surface connection to a closed drain. The upstream end
of any structure through which water may flow.
A natural, transient body or conveyance of water that exists
for a relatively long time, but for weeks or months of the year is
below the local water table and obtains its flow from both surface
runoff and groundwater discharges.
A defined channel in which surface water is absent during
a portion of the year, in response to seasonal variations in precipitation
or groundwater discharge.
Plants which grow quickly and aggressively, spreading, and
displacing other plants. Invasives typically are introduced into a
region far from their native habitat. See Invasive Plants in Pennsylvania
by the Department of Conservation and Natural Resources.
The lowest surface, the floor or bottom of a culvert, pipe,
drain, sewer, channel, basin, BMP, or orifice.
A type of topography or landscape characterized by surface
depressions, sinkholes, rock pinnacles/uneven bedrock surface, underground
drainage, and caves. Karst is formed on carbonate rocks, such as limestone
or dolomite.
Any of the following activities:
The improvement of one lot or two or more contiguous lots, tracts,
or parcels of land for any purpose involving:
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
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;
A subdivision of land;
Development in accordance with Section 503(1.1) of the Pennsylvania
Municipalities Planning Code[2] (as amended).
Any activity involving grading, tilling, digging, or filling
of ground or stripping of vegetation or any other activity that causes
an alteration to the natural condition of the land.
The use of land for activities in the following categories:
MAJOR LAND DISTURBANCE ACTIVITYThe use of land for any purpose involving:
Installation of new impervious or semi-impervious surface that
is either in excess of 5,000 square feet or 2/3 of the total lot area,
or
Diversion of piping of any natural or man-made watercourse,
or
Removal of ground cover, grading, filling, or excavation in
excess of one acre, except for the agricultural use of land when operated
in accordance with a farm conservation plan approved by the Lancaster
County conservation district.
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 they
are authorized under the lease to exercise the rights of the landowner,
or other person having a proprietary interest in the land.
A Pennsylvania registered professional engineer, registered
landscape architect, registered professional land surveyor, or registered
professional geologist, or any person licensed by the Pennsylvania
Department of State or qualified by law to perform the work required
by the ordinance within the Commonwealth of Pennsylvania.
A soil horizon or condition in the soil profile or underlying
strata that includes one of the following:
A seasonal high water table, whether perched or regional, determined
by direct observation of the water table or indicated by other subsurface
or soil conditions.
A rock with open joints, fracture or solution channels, or masses
of loose rock fragments, including gravel, with insufficient fine
soil to fill the voids between the fragments.
A rock formation, other stratum, or soil condition that is so
slowly permeable that it effectively limits downward passage of water.
A linear feature in a landscape which is an expression of
an underlying geological structure such as a fault.
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.
Any stream segment or other runoff conveyance facility used
as a reach in the Conestoga River hydrologic model.
The action taken to restore or preserve the as-built functional
design of any stormwater management facility or system.
An equation 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. Manning's
Equation assumes steady, gradually varied flow.
Applies when the applicant demonstrates to the municipality'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.
An agreement between East Earl Township and the Lancaster
County conservation district to provide for cooperation between the
Lancaster County conservation district and the East Earl Township
officials, Lancaster County, to include within its ordinances, and
to jointly promote conservation of natural resources within East Earl
Township on lands both public and private, for the purposes of preventing
accelerated soil erosion and sedimentation of streams, reducing storm
water damage, and promoting the health, safety and general welfare
of the residents of East Earl Township.
The Mill Creek Watershed Storm Water Management Plan as approved
by PaDEP.
Act of July 31, 1968, P.L. 805, No. 247, 53 P.S. § 10101,
et seq., as amended, the Pennsylvania Municipalities Planning Code,
Act 247.
A professional engineer licensed as such in the Commonwealth
of Pennsylvania, duly appointed as the engineer for the municipality,
planning agency, or joint planning commission.
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:
Owned or operated by a state, city, town, township, township,
county, district, association or other public body (created under
state law) having jurisdiction over disposal of sewage, industrial
wastes, stormwater or other wastes;
Designed or used for collecting or conveying stormwater;
Not a combined sewer; and
Not part of a publicly owned treatment works as defined at 40
CFR 122.2.
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).
For the purposes of determining compliance with this chapter; all
municipal separate storm sewers shall be considered part of an MS4.
East Earl Township, Lancaster County, Pennsylvania.
East Earl Township, Lancaster County, Pennsylvania.
Plant species that have evolved or are indigenous to a specific
geographical area. These plants are adapted to local soil and weather
conditions as well as pests and diseases.
An existing channel for water runoff that was formed by natural
forces.
Ground cover which mimics the infiltration characteristics
of predominant hydrologic soil group found at the site.
Any regulated activity involving placement or construction
of new impervious surface or grading over existing pervious land areas
not classified as redevelopment as defined in this chapter.
National Oceanic and Atmospheric Administration.
Pollution that enters a water body from diffuse origins in
the watershed and does not result from discernible, confined, or discrete
conveyances.
Water flowing in stormwater collection facilities, such as
pipes or swales, which is not the result of a rainfall event or snowmelt.
See "best management practice (BMP)."
National Pollutant Discharge Elimination System, the federal
government's system for issuance of permits under the Clean Water
Act, which is delegated to DEP in Pennsylvania.
USDA Natural Resources Conservation Service (previously SCS).
A drainage element in which stormwater flows with an open
surface. Open channels include, but shall not be limited to, natural
and man-made drainage ways, swales, streams, ditches, canals, and
pipes flowing partly full. Open channels may include closed conduits
so long as the flow is not under pressure.
Pennsylvania Department of Environmental Protection.
The parcel of land from which a land development or subdivision
originates, determined from the date of municipal adoption of this
chapter.
The maximum rate of stormwater runoff from a specific storm
event.
Pennsylvania Department of Transportation.
Document Number 363-0300-002 (December 2006, and as subsequently
amended).
Any area not defined as impervious.
A culvert, closed conduit, or similar structure (including
appurtenances) that conveys stormwater.
The Planning Commission of East Earl Township, Lancaster
County, Pennsylvania.
The SWM and erosion and sediment control plans and narratives.
The flood that may be expected from the most severe combination
of critical meteorologic and hydrologic conditions that are reasonably
possible in any area. The PMF is derived from the probable maximum
precipitation (PMP) as determined on the basis of data obtained from
the National Oceanographic and Atmospheric Administration (NOAA).
Any discernible, confined, and discrete conveyance including,
but not limited to, any pipe, ditch, channel, tunnel, or conduit from
which stormwater is or may be discharged, as defined in state regulations
at 25 Pennsylvania Code § 92.1.
Period after construction during which disturbed areas are
stabilized, stormwater controls are in place and functioning, and
all proposed improvements approved by the municipality are completed.
Ground cover conditions assumed to exist within the proposed
disturbed area prior to commencement of the regulated activity for
the purpose of calculating the predevelopment water quality volume,
infiltration volume, and peak flow rates as required in this chapter.
Techniques employed in stormwater BMPs to provide storage
or filtering, or other methods to trap or remove coarse materials
and other pollutants before they enter the stormwater system, but
may not necessarily be designed to meet the entire water quality volume
requirements of this chapter.
Water that comes in contact with any raw material, product,
byproduct, or waste during any production or industrial process.
The specific area of land where any regulated activities
in the municipality are planned, conducted, or maintained.
All new additional and replacement impervious surfaces.
Any person licensed by the Pennsylvania Department of State
or otherwise qualified by law to perform the work required by this
chapter. See also licensed professional.
The depth of accumulated rainfall per unit of time.
The replenishment of groundwater through the infiltration
of rainfall, other surface waters, or land application of water or
treated wastewater.
Where a regulated activity constitutes a subdivision or land
development, the final subdivision or land development plan which
contains the information this chapter 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.
Any regulated activity that involves demolition, removal,
reconstruction, or replacement of existing impervious surface(s).
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.
Any earth disturbance activities or any activities that involve
the alteration or development of land in a manner that may affect
stormwater runoff.
Activity involving earth disturbance subject to regulation
under 25 Pa. Code 92, 25 Pa. Code 102, or the Clean Streams Law.
Proposed impervious surface as part of a current proposed
activity and all existing impervious surfaces installed after 2022,
as part of previous activity.
For a specific design storm or list of design storms, the
percentage of peak flow rate for existing conditions which may not
be exceeded for the proposed conditions.
A graphical representation of the release rates for a specific
area.
The prevention of direct discharge of stormwater runoff into
surface waters or water bodies during or after a storm event by permanent
containment in a pond or depression; examples include systems which
discharge by percolation to groundwater, exfiltration, and/or evaporation
processes and which generally have residence times of less than three
days.
An impoundment that is designed to temporarily detain a certain
amount of stormwater from a catchment area and which may be designed
to permanently retain stormwater runoff from the catchment area; retention
basins always contain water.
The volume of runoff that is captured and not released directly
into the surface waters of this Commonwealth during or after a storm
event.
The average interval, in years, within which a storm event
of a given magnitude can be expected to occur one time. For example,
the twenty-five-year return period rainfall would be expected to occur
on 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 4% chance).
Pertaining to anything connected with or immediately adjacent
to the banks of a stream or other body of water.
A permanent area of trees and shrubs located adjacent to
streams, lakes, ponds and wetlands.
A narrow strip of land, centered on a stream or river that
includes the floodplain as well as related riparian habitats adjacent
to the floodplain.
An easement created for the purpose of protecting and preserving
a riparian corridor.
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.
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.
Temporary ponding and gradual release of stormwater falling
directly onto roof surfaces by incorporating controlled-flow roof
drains into building designs.
Any part of precipitation that flows over the land.
See Subdivision and land development Ordinance.
Soil Conservation Service, now known as the Natural Resources
Conservation Service.
Soils or other materials transported by surface water as
a product of erosion.
A barrier, dam, retention or detention basin located and
designed to retain rock, sand, gravel, silt, or other material transported
by water.
The placement, discharge or any other introduction of sediment
into the waters of this commonwealth occurring from the failure to
design, construct, implement or maintain control measures and control
facilities in accordance with the requirements of this chapter.
The action or process of forming or depositing sediment in
waters of this commonwealth.
An area of excavated earth filled with loose stone or similar
coarse material, into which surface water is directed for infiltration
into the ground.
A surface which prevents some infiltration of water into
the ground.
See "municipal separate storm sewer" and "municipal separate
storm sewer system."
A flow process associated with broad, shallow water movement
on sloping ground surfaces that is not channelized or concentrated.
Total area of land in the municipality where any proposed
regulated activity, as defined in this chapter, is planned, conducted,
or maintained or that is otherwise impacted by the regulated activity.
Regulated activities that, measured on a cumulative basis
from the date of enactment of this chapter, create the following;
For a residential use within all zoning districts the construction
of additional impervious areas of 1,000 square feet and less than
2,500 square feet with an earth disturbance activity of an area less
than 4,000 square feet and does not involve the alteration of stormwater
facilities or watercourses; or
For an agricultural use within an agricultural zone, on a lot
that does not have an implemented agricultural conservation plan approved
by the Lancaster County conservation district, the construction of
additional impervious areas of 1,000 square feet and less than 2,500
square feet; with an earth disturbance activity of an area of an area
less than 4,000 square feet and does not involve the alteration of
stormwater facilities or watercourses; or
For an agricultural use within an agricultural zone, on a lot
that has an implemented agricultural conservation plan approved by
the Lancaster County conservation district, the construction of additional
impervious areas of 100 square feet and less than 5,000 square feet
with an earth disturbance activity of an area less than 5,000 square
feet and does not involve the alteration of stormwater facilities
or watercourses.
A storm having a frequency of recurrence of once every two
years or smaller.
A method of runoff computation developed by NRCS that is
based on relating soil type and land use/cover to a runoff parameter
called curve number (CN).
A depression in the embankment of a pond or basin which is
used to pass a post-development 100-year-storm peak flow rate.
The current regulatory requirements to protect, maintain,
reclaim, and restore water quality under Title 25 of the Pennsylvania
Code and the Clean Streams Law.
A volume above or below ground that is available to hold
stormwater.
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.
See "return period."
Drainage runoff from the surface of the land resulting from
precipitation or snow or ice melt.
A program of controls and measures designed to regulate the
quantity and quality of stormwater runoff from a development while
promoting the protection and conservation of groundwaters and groundwater
recharge.
The plan prepared by the developer or his representative
indicating how stormwater runoff will be managed at the development
site in accordance with this chapter. Stormwater management site plan
will be designated as SWM site plan throughout this chapter.
Act of October 4, 1978, P.L. 864, No. 167, as amended 32
P.S. § 680.1 et seq.
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; storm
sewers; pipes; and infiltration facilities.
A natural watercourse.
A bridge, culvert or other structure in excess of 100 feet
in length upstream to downstream which encloses a regulated water
of this commonwealth.
Physical devices and practices that capture and treat stormwater
runoff. Structural stormwater BMPs are permanent appurtenances to
the development site.
Any man-made object having an ascertainable stationary location
on or in land or water, whether or not affixed to the land.
As defined in the Pennsylvania Municipalities Planning Code5, Act of July 31, 1968, P.L. 805, No. 247.
The Subdivision and land development Ordinance of East Earl
Township, Lancaster County, PA, as amended. Also referred to as "SALDO."
The smallest drainage unit of a watershed for which storm
water management criteria have been established.
The smallest drainage unit of a watershed for which storm
water management criteria have been established in an Act 167 Plan.
An artificial or natural waterway or low-lying stretch of
land that gathers and conveys stormwater or runoff, and is generally
vegetated for soil stabilization, stormwater pollutant removal, and
infiltration.
Stormwater management.
A stormwater management site plan.
See "forest management."
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.
Highest point of elevation of the bank of a stream or channel
cross-section at which a rising water level just begins to flow out
of the channel and into the floodplain.
East Earl Township, Lancaster County, Pennsylvania.
The computer-based hydrologic modeling technique adapted
to the applicable watershed for an approved Act 167 Plan. The model
has been "calibrated" to reflect published and observed flow values
by adjusting key model input parameters.
The sequencing of structural best management practices to
achieve optimal flow management and pollutant removal from urban stormwater.
The United States Department of Agriculture.
SWM controls, or BMPs, used to remove a predetermined amount
of runoff or the increase in volume between the pre- and post-development
design storm.
The upper most level of saturation of pore space or fractures
by groundwater. Seasonal high-water table refers to a water table
that rises and falls with the seasons due either to natural or man-made
causes.
A channel or conveyance of surface water having a defined
bed and banks, whether natural or artificial, with perennial or intermittent
flow.
Any and all rivers, streams, creeks, rivulets, impoundments,
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.
Region or area drained by a river, watercourse, or other
surface water of this commonwealth.
Areas that are inundated or saturated by surface 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, and similar areas.
Any land area of at least 1/4 acre with a natural or naturalized
ground cover (excluding manicured turf grass) and that has an average
density of two or more viable trees per 1,500 square feet with a DBH
of six inches or greater. The land area to be considered woods shall
be measured from the outer drip lines of the outer trees.
