A.
For the purpose 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 word "person" includes an individual, firm, association, organization,
partnership, trust, company, corporation, or any other similar entity.
(4)
The words "shall" and "must" are mandatory; the words "may" and "should"
are permissive.
(5)
The words "used or occupied" include the words "intended, designed,
maintained, or arranged to be used, occupied or maintained."
B.
ACCELERATED EROSION
AGRICULTURAL ACTIVITIES
ALTERATION
APPLICANT
BEST MANAGEMENT PRACTICES (BMPS)
CHANNEL EROSION
CISTERN
CONSERVATION DISTRICT
CULVERT
DAM
DESIGNEE
DESIGN STORM
DETENTION BASIN
DETENTION VOLUME
DEVELOPER
DEVELOPMENT SITE (SITE)
DISTURBED AREA
DOWNSLOPE PROPERTY LINE
DRAINAGE CONVEYANCE FACILITY
DRAINAGE EASEMENT
DRAINAGEWAY
EARTH DISTURBANCE ACTIVITY
EROSION
EROSION AND SEDIMENT POLLUTION CONTROL PLAN
EXCEPTIONAL VALUE WATERS
EXISTING CONDITIONS
FEMA
FLOOD
FLOOD FRINGE
FLOODPLAIN
FLOODWAY
FOREST MANAGEMENT/TIMBER OPERATIONS
FREEBOARD
GRADE
GROUNDWATER RECHARGE
HEC-HMS MODEL CALIBRATED
HIGH QUALITY WATERS
HYDROLOGIC SOIL GROUP (HSG)
IMPERVIOUS SURFACE (IMPERVIOUS AREA)
IMPOUNDMENT
INFILTRATION STRUCTURES
INLET
LAND DEVELOPMENT (DEVELOPMENT)
LOW IMPACT DEVELOPMENT (LID)
MAIN STEM (MAIN CHANNEL)
MANNING EQUATION (MANNING FORMULA)
MUNICIPALITY
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)
NOAA ATLAS 14
NONPOINT SOURCE POLLUTION
NRCS
OPEN CHANNEL
OUTFALL
OUTLET
PADEP
PARKING LOT STORAGE
PEAK DISCHARGE
PERSON
PERVIOUS AREA
PIPE
PLANNING COMMISSION
POINT SOURCE
PROBABLE MAXIMUM FLOOD (PMF)
PROJECT SITE
QUALIFIED PROFESSIONAL
RATIONAL FORMULA
REDEVELOPMENT
REGULATED ACTIVITIES
REGULATED EARTH DISTURBANCE ACTIVITY
RELEASE RATE
RELEASE RATE DISTRICT
RETENTION BASIN
RETENTION VOLUME/REMOVED RUNOFF
RETURN PERIOD
RIPARIAN BUFFER
RISER
ROAD MAINTENANCE
ROOFTOP DETENTION
RUNOFF
RUNOFF CAPTURE VOLUME
SEDIMENT
SEDIMENTATION
SEDIMENT BASIN
SEDIMENT POLLUTION
SEEPAGE PIT/SEEPAGE TRENCH
SEPARATE STORM SEWER SYSTEM
SHEET FLOW
SOIL COVER COMPLEX METHOD
SPILLWAY (EMERGENCY)
STATE WATER QUALITY REQUIREMENTS
STORAGE INDICATION METHOD
STORM FREQUENCY
STORM SEWER
STORMWATER
STORMWATER HOTSPOT
STORMWATER MANAGEMENT FACILITIES
STORMWATER MANAGEMENT PLAN
STORMWATER MANAGEMENT SITE PLAN (SWM SITE PLAN)
STREAM ENCLOSURE
SUBDIVISION
SUBWATERSHED AREA
SWALE
TIMBER OPERATIONS
TIME OF CONCENTRATION (Tc)
USDA
WATERCOURSE
WATERSHED
WATERS OF THE COMMONWEALTH
WETLAND
As used in this chapter, the following terms shall have the meanings
indicated:
The removal of the surface of the land through the combined
action of human activity and natural processes at a rate greater than
would occur because of the natural process alone.
Activities associated with agriculture such as agricultural
cultivation, agricultural operation, and animal heavy use areas. This
includes the work of producing crops, 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.
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;
changing of surface conditions by causing the surface to be more or
less impervious; land disturbance.
A landowner, developer, or other person who has filed an
application for approval to engage in any regulated activities at
a project site within 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: nonstructural
or structural. Nonstructural BMPs are measures referred to as operational
and/or behavior-related practices that attempt to minimize 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 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 widening, deepening, and headward cutting of small channels
and waterways, due to erosion caused by moderate to large floods.
An underground reservoir or tank used for storing rainwater.
The Butler County Conservation District. The Butler County
Conservation District has the authority under a delegation agreement
executed with the Department of Environmental Protection to administer
and enforce all or a portion of the regulations promulgated under
25 Pa. Code Chapter 102.
A structure with appurtenant works that carries a stream
and/or stormwater runoff 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 agent of this municipality and/or agent of the governing
body involved with the administration, review or enforcement of any
provisions of this chapter by contract or memorandum of understanding.
The magnitude and temporal distribution of precipitation
from a storm event measured in probability of occurrence (e.g., a
twenty-five-year storm) and duration (e.g., 24 hours), used in the
design and evaluation of stormwater management systems. Also see "return
period."
An impoundment structure designed to manage stormwater runoff
by temporarily storing the runoff and releasing it at a predetermined
rate.
The volume of runoff that is captured and released into waters
of the commonwealth at a controlled rate.
A person, partnership, association, corporation, or other
entity, or any responsible person therein or agent thereof, that undertakes
any regulated activity of this chapter.
The specific tract of land for which a regulated activity
is proposed. Also see "project site."
An unstabilized land area where an earth disturbance activity
is occurring or has occurred.
That portion of the property line of the lot, tract, or parcels
of land being developed located such that all overland or pipe flow
from the site would be directed toward it.
A stormwater management facility designed to convey stormwater
runoff and shall include streams, channels, swales, pipes, conduits,
culverts, storm sewers, etc.
A right granted by a landowner to a grantee, allowing the
use of private land for stormwater management, drainage, or conveyance
purposes.
Any natural or artificial watercourse, trench, ditch, pipe,
swale, channel, or similar depression into which surface water flows.
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, timber harvesting activities, road maintenance
activities, mineral extraction, and the moving, depositing, stockpiling,
or storing of soil, rock or earth materials.
The movement of soil particles by the action of water, wind,
ice, or other natural forces.
A plan which is designed to minimize accelerated erosion
and sedimentation.
Surface waters of high quality, which satisfies Pa. Code
Title 25, Environmental Protection, Chapter 93, Water Quality Standards,
§ 93.4b(b) (relating to antidegradation).
The initial condition of a project site prior to the proposed
construction. If the initial condition of the site is undeveloped
land and not forested, the land use shall be considered as "meadow"
unless the natural land cover is documented to generate lower curve
numbers or Rational "C" Coefficient.
The Federal Emergency Management Agency.
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 the commonwealth.
The remaining portions of the one-hundred-year floodplain
outside of the floodway boundary.
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, mapped as being a special flood hazard area. Included are lands adjoining a river or stream that have been or may be inundated by a one-hundred-year flood. Also included are areas that comprise Group 13 soils, as listed in Appendix A of the Pennsylvania Department of Environmental Protection (PADEP) Technical Manual for Sewage Enforcement Officers (as amended or replaced from time to time by PADEP).
The channel of the watercourse and those portions of the
adjoining floodplains that 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 landward from the top of the bank
of the stream.
Planning and activities necessary for the management of forestland.
These include timber inventory and 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 elevation of the design high
water and the top of a dam, levee, tank, basin, or diversion ridge.
The space is required as a safety margin in a tank, pond or basin.
Replenishment of existing natural underground water supplies.
(Hydrologic Engineering Center Hydrologic Modeling System)
A computer-based hydrologic modeling technique adapted to the watershed(s)
in Butler County for the Act 167 Plan. The model has been calibrated
by adjusting key model input parameters.
Surface water having quality which exceeds levels necessary
to support propagation of fish, shellfish, and wildlife and recreation
in and on the water by satisfying Pa. Code Title 25, Environmental
Protection, Chapter 93, Water Quality Standards, § 93.4b(a).
Infiltration rates of soils vary widely and are affected
by subsurface permeability as well as surface intake rates. Soils
are classified into one of four HSGs (A, B, C, and D) according to
their minimum infiltration rate, which is obtained for bare soil after
prolonged wetting. The Natural Resource Conservation Service (NRCS)
of the United States Department of Agriculture 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 interest may
be identified from a soil survey report from the local NRCS office
or the County Conservation District.
A surface that prevents the infiltration of water into the
ground. Impervious surface (or areas) include, but is not limited
to, roofs, additional indoor living spaces, patios, garages, storage
sheds and similar structures, parking or driveway areas, and any new
streets and sidewalks. Any surface areas proposed to initially be
gravel or crushed stone shall be assumed to be impervious surfaces.
A retention or detention basin designed to retain stormwater
runoff and release it at a controlled rate.
A structure designed to direct runoff into the ground (e.g.,
french drains, seepage pits, seepage trenches, etc.).
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.
An approach to land development that uses various land planning
and design practices and technologies to simultaneously conserve and
protect natural resource systems and reduce infrastructure costs.
LID still allows land to be developed, but in a cost-effective manner
that helps mitigate potential environmental impacts.
Any stream segment or other runoff conveyance facility used
as a reach in the Butler County Act 167 watershed hydrologic model(s).
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.
City of Butler, Butler County, Pennsylvania.
The federal government's system for issuance of permits
under the Clean Water Act, which is delegated to PADEP in Pennsylvania.
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 can be accessed at Internet address http://hdsc.nws.noaa.gov/hdsc/pfds/.
Pollution that enters a water body from diffuse origins in
the watershed and does not result from discernible, confined, or discrete
conveyances.
Natural Resource Conservation Service [previously Soil Conservation
Service (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 drainageways, swales, streams, ditches, canals, and pipes
not under pressure.
Points of water disposal from a stream, river, lake, tidewater,
or artificial drain.
The Pennsylvania Department of Environmental Protection.
Involves the use of impervious parking areas as temporary
impoundments with controlled release rates during rainstorms.
The maximum rate of stormwater runoff from a specific storm
event.
An individual, partnership, public or private association
or corporation, or a governmental unit, public utility or any other
legal entity whatsoever which is recognized by law as the subject
of rights and duties.
Any area not defined as impervious.
A culvert, closed conduit, or similar structure (including
appurtenances) that conveys stormwater.
The Planning Commission of City of Butler
Any discernible, confined, or 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 Pa. Code § 92.1.
The flood that may be expected from the most severe combination
of critical meteorological 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).
The specific area of land where any regulated activities
in the municipality are planned, conducted, or maintained.
Any person licensed by the Pennsylvania Department of State
or otherwise qualified by law to perform the work required by the
chapter.
A rainfall-runoff relation used to estimate peak flow.
Earth disturbance activities on land which has previously
been developed.
Any earth disturbance activities or any activities that involve
the alteration or development of land in a manner that may affect
stormwater runoff.
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.
Those subwatershed areas in which post-development flows
must be reduced to a certain percentage of predevelopment flows as
required to meet the plan requirements and the goals of Act 167.
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.
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 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 given year is 0.04 (i.e., a four-percent
chance).
A vegetated area bordering perennial and intermittent streams
and wetlands, that serves as a protective filter to help protect streams/wetlands
from the impacts of adjacent land uses.
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.
Earth disturbance activities within the existing road right-of-way,
such as grading and repairing existing unpaved road surfaces, cutting
road banks, cleaning or clearing drainage ditches, and other similar
activities. Road maintenance activities that do not disturb the subbase
of a paved road (such as milling and overlays) are not considered
earth disturbance activities.
Temporary ponding and gradual release of stormwater falling
directly onto flat roof surfaces by incorporating controlled-flow
roof drains into building designs.
Any part of precipitation that flows over the land surface.
The volume of runoff that is captured (retained) and not
released into surface waters of the commonwealth during or after a
storm event.
Soils or other materials transported by surface water as
a product of erosion.
The process by which mineral or organic matter is accumulated
or deposited by the movement of water.
A barrier, dam, retention or detention basin located and
designed to retain rock, sand, gravel, silt, or other material transported
by stormwater runoff.
The placement, discharge, or any other introduction of sediment
into waters of the commonwealth occurring from the failure to properly
design, construct, implement or maintain control measures and control
facilities in accordance with the requirements of this chapter.
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 conveyance or system of conveyances (including roads with
drainage systems, municipal streets, catch basins, curbs, gutters,
ditches, man-made channels, or storm drains) primarily used for collecting
and conveying stormwater runoff.
Runoff that flows over the ground surface as a thin, even
layer, not concentrated in a channel.
A method of runoff computation developed by the 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, or other
overflow structure, that is used to pass peak discharges greater than
the maximum design storm controlled by the pond or basin.
The regulatory requirements to protect, maintain, reclaim,
and restore water quality under Title 25 of the Pennsylvania Code
and the Clean Streams Law.[2]
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.
The number of times that a given storm event occurs or is
exceeded on the average in a stated period of years. See also "return
period."
A system of pipes and/or open channels that convey intercepted
runoff and stormwater from other sources, but excludes domestic sewage
and industrial wastes.
Runoff from the surface of the land resulting from precipitation,
snow, or ice melt.
A land use or activity that generates higher concentrations
of hydrocarbons, trace metals, or toxicants than are found in typical
stormwater runoff.
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.
The Butler County stormwater management plan for managing
stormwater runoff in Butler County as required by the Act of October
4, 1978, P.L. 864, (Act 167) and known as the "Storm Water Management
Act."[3]
The plan prepared by the applicant or his representative
indicating how stormwater runoff will be managed at the project site
in accordance with this chapter.
A bridge, culvert, or other structure in excess of 100 feet
in length upstream to downstream which encloses a regulated waters
of the commonwealth.
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, 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 dwellings, shall be exempt (Pennsylvania Municipalities
Planning Code, Act of July 31, 1968, P.L. 805, No. 247).[4]
The smallest drainage unit of a watershed for which stormwater
management criteria has been established in the stormwater management
plan.
A low-lying stretch of land that gathers or carries surface
water runoff.
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.
The United States Department of Agriculture.
A channel or conveyance of surface water, such as a stream
or creek, having defined bed and banks, whether natural or artificial,
with perennial or intermittent flow.
Area drained by a river, watercourse, or other surface water,
whether natural or artificial.
Rivers, streams, creeks, rivulets, impoundments, ditches,
watercourses, storm sewers, lakes, dammed water, wetlands, ponds,
springs and other bodies or channels of conveyance of surface and
underground water, or parts thereof, whether natural or artificial,
within or on the boundaries of the Commonwealth of Pennsylvania.
Those 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. (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 and a wetland
area designated by a river basin commission. This definition is used
by the United States Environmental Protection Agency and the United
States Army Corps of Engineers.)
