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.
ACCELERATED EROSION
AGRICULTURAL ACTIVITY
APPLICANT
BEST MANAGEMENT PRACTICE (BMP)
BEST MANAGEMENT PRACTICE OPERATIONS AND MAINTENANCE PLAN
BIORETENTION
BUFFER
(1)
(2)
CAPTURE/REUSE
CARBONATE BEDROCK
CISTERN
CLOSED DEPRESSION
CONSERVATION DISTRICT
CONSTRUCTED WETLANDS
CULVERT
DAM
DEP
DESIGN STORM
DETENTION BASIN
DETENTION VOLUME
DEVELOPER
DEVELOPMENT SITE (SITE)
DIFFUSED DRAINAGE
DISTURBED AREA
DRAINAGE EASEMENT
DRAINAGE PLAN
EARTH DISTURBANCE ACTIVITY
EROSION
EXISTING CONDITION
EXISTING USES
FEMA
FILL
FILTER STRIPS
FLOODPLAIN
FLOODWAY
FOREST MANAGEMENT/TIMBER OPERATIONS
FREEBOARD
GREEN INFRASTRUCTURE
GROUNDWATER RECHARGE
HARDSHIP WAIVER REQUEST
HOT SPOT LAND USES
HYDROLOGIC SOIL GROUP (HSG)
IMPERVIOUS SURFACE (IMPERVIOUS AREA OR IMPERVIOUS COVER)
INFILTRATION PRACTICE
KARST
LAND DEVELOPMENT (DEVELOPMENT)
(1)
(2)
(3)
(a)
[1]
[2]
(b)
(c)
LOADING RATE
LOCAL RUNOFF CONVEYANCE FACILITIES
LOW-IMPACT DEVELOPMENT (LID)
MAINSTEM (MAIN CHANNEL)
MANNING EQUATION (MANNING FORMULA)
MARYLAND STORMWATER DESIGN MANUAL
MINIMUM DISTURBANCE/MINIMUM MAINTENANCE PRACTICES (MD/MM)
MUNICIPALITY
NO HARM OPTION
NPDES
NRCS or NATURAL RESOURCES CONSERVATION SERVICE
OIL/WATER SEPARATOR
OUTFALL
OWNER
PEAK DISCHARGE
PENN STATE RUNOFF MODEL (PSRM)
PERSON
PERVIOUS AREA
POINT SOURCE
PRELIMINARY SITE INVESTIGATION
PROJECT SITE
PUBLIC WATER SUPPLIER
PUBLIC WATER SYSTEM
QUALIFIED GEOTECHNICAL PROFESSIONAL
QUALIFIED PROFESSIONAL
RATIONAL METHOD
REACH
RECHARGE VOLUME (REV)
REGULATED ACTIVITIES
REGULATED EARTH DISTURBANCE ACTIVITIES
RELEASE RATE
RETENTION VOLUME/REMOVED RUNOFF
RETURN PERIOD
RIPARIAN BUFFER
ROAD MAINTENANCE
RUNOFF
SEDIMENT
SEDIMENT TRAPS/CATCH BASIN SUMPS
SEEPAGE PIT/SEEPAGE TRENCH
SEPARATE STORM SEWER SYSTEM
SHEET FLOW
SOIL-COVER-COMPLEX METHOD
SPECIAL GEOLOGIC FEATURES
SPILL PREVENTION AND RESPONSE PROGRAM
STATE WATER QUALITY REQUIREMENTS
(1)
(2)
(3)
STORAGE INDICATION METHOD
STORM DRAINAGE PROBLEM AREAS
STORM SEWER
STORMWATER
STORMWATER FILTERS
STORMWATER MANAGEMENT FACILITY
STORMWATER MANAGEMENT PLAN
STORMWATER MANAGEMENT SITE PLAN
STREAM
SUBAREA
SUBDIVISION
SWALE
TECHNICAL BEST MANAGEMENT PRACTICE MANUAL AND INFILTRATION FEASIBILITY
REPORT, NOVEMBER 2002
TRASH/DEBRIS COLLECTORS
USDA
VEGETATED BUFFERS
VEGETATED ROOFS
VEGETATED SWALES
(1)
(2)
WATER QUALITY INSERTS
WATER QUALITY VOLUME (WQV)
WATERCOURSE
WATERS OF THIS COMMONWEALTH
WATERSHED
WETLAND
These definitions do not necessarily reflect the definitions contained
in pertinent regulations or statutes, and are intended for this chapter
only.
The removal of the surface of the land through the combined
action of human activities and natural processes at a rate greater
than would occur because of the natural processes alone.
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.
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 listed in § 26-5, 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.
Documentation, included as part of a drainage plan, detailing
the proposed BMPs, how they will be operated and maintained and who
will be responsible.
Densely vegetated, depressed features that store stormwater
and filter it through vegetation, mulch, planting soil, etc. Ultimately
stormwater is evapotranspirated, infiltrated, or discharged. Optimal
bioretention areas mimic natural forest ecosystems in terms of species
diversity, density, distribution, use of native plants, etc.
STREAMSIDE BUFFERA zone of variable width located along a stream that is vegetated and is designed to filter pollutants from runoff.
SPECIAL GEOLOGIC FEATURE BUFFERA required isolation distance from a special geologic feature to a proposed BMP needed to reduce the risk of sinkhole formation due to stormwater management activities.
Stormwater management techniques, such as cisterns and rain
barrels, which direct runoff into storage devices, surface or subsurface,
for later reuse, such as for irrigation of gardens and other planted
areas. Because this stormwater is utilized and no pollutant discharge
results, water quality performance is superior to other noninfiltration
BMPs.
Rock consisting chiefly of carbonate minerals, such as limestone
and dolomite; specifically a sedimentary rock composed of more than
50% by weight of carbonate minerals that underlies soil or other unconsolidated,
superficial material.
An underground reservoir or tank for storing rainwater.
A distinctive bowl-shaped depression in the land surface.
It is characterized by internal drainage, varying magnitude, and an
unbroken ground surface.
The Lehigh County Conservation District, as applicable and
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 Chapter 102.
Constructed wetlands are similar to wet ponds (see below)
and consist of a basin which provides for necessary stormwater storage
as well as a permanent pool or water level, planted with wetland vegetation.
To be successful, constructed wetlands must have adequate natural
hydrology (both runoff inputs as well as soils and water table which
allow for maintenance of a permanent pool of water). In these cases,
the permanent pool must be designed carefully, usually with shallow
edge benches, so that water levels are appropriate to support carefully
selected wetland vegetation.
A pipe, conduit or similar structure including appurtenant
works which carries surface water.
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 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."
A basin designed to retard stormwater runoff by temporarily
storing the runoff and releasing it at the appropriate release rate.
The volume of runoff that is captured and released into the
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. See "project site."
See "sheet flow."
An unstabilized land area where an earth disturbance activity
is occurring or has occurred.
A right granted by a landowner to a grantee allowing the
use of private land for stormwater management purposes.
The documentation of the proposed stormwater quantity and quality management controls to be used for a given development site, including a BMP operations and maintenance plan, the contents of which are established in § 26-26.
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.
The natural process by which the surface of the land is worn
away by water, wind, or chemical action.
The dominant land cover during the five-year period immediately
preceding a proposed regulated activity.
Those uses actually attained in the water body on or after
November 28, 1975, whether or not they are included in the water quality
standards (25 Pa. Code § 93.1).
Federal Emergency Management Agency.
Man-made deposits of natural soils or rock products and waste
materials.
See "vegetated buffers."
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 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.
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.
The incremental depth in a stormwater management structure,
provided as a safety factor of design, above that required to convey
the design runoff event.
Systems and practices that use or mimic natural processes
to infiltrate, evapotranspire, or reuse stormwater on the site where
it is generated.
Replenishment of existing natural underground water supplies.
A written request for a waiver alleging that the provisions
of this chapter inflict unnecessary hardship upon the applicant. A
hardship waiver does not apply to and is not available from the water
quality provisions of this chapter and should not be granted.
A land use or activity that generates higher concentrations of hydrocarbons, trace metals or other toxic substances than typically found in stormwater runoff. These land uses are listed in § 26-17P.
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. Decks,
parking areas, and driveway areas are not counted as impervious areas
if they do not prevent infiltration.
A practice designed to direct runoff into the ground, e.g.,
French drain, seepage pit, seepage trench or bioretention area.
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.
Inclusive of any or all of the following meanings:
The improvement of one lot or two or more contiguous lots, tracts,
or parcels of land for any purpose involving i) a group of two or
more buildings; or ii) The division or allocation of land or space
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;
Any subdivision of land;
Development in accordance with Section 503(1.1) of the PA Municipalities
Planning Code, including 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. [See 53 P.S. § 10503(1.1).]
The ratio of the land area draining to the system, as modified by the weighting factors in § 26-19, compared to the base area of the infiltration system.
Any natural channel or man-made conveyance system which has
the purpose of transporting runoff from the site to the mainstem.
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 conveyance used as a reach in
the Whitehall Township Watershed hydrologic model.
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.
A stormwater design manual written by the Maryland Department
of the Environment and the Center for Watershed Protection. As of
January 2004, the manual can be obtained through the following website:
www.mde.state.md.us.
Site design practices in which careful limits are placed
on site clearance prior to development allowing for maximum retention
of existing vegetation (woodlands and other), minimum disturbance
and compaction of existing soil mantle and minimum site application
of chemicals post-development. Typically, MD/MM includes disturbance
setback criteria from buildings as well as related site improvements
such as walkways, driveways, roadways, and any other improvements.
These criteria may vary by community context as well as by type of
development being proposed. Additionally, MD/MM also shall include
provisions (e.g., deed restrictions, conservation easements) to protect
these areas from future disturbance and from application of fertilizers,
pesticides, and herbicides.
Whitehall Township, Lehigh County, Pennsylvania.
The option of using a less restrictive runoff quantity control
if it can be shown that adequate and safe runoff conveyance exists
and that the less restrictive control would not adversely affect health,
safety and property.
National Pollutant Discharge Elimination System.
USDA Natural Resources Conservation Service (previously SCS).
A structural mechanism designed to remove free oil and grease
(and possibly solids) from stormwater runoff.
"Point source" as described in 40 CFR 122.2 at the point
where the municipality's storm sewer system discharges to surface
waters of the commonwealth.
One with an interest in and often dominion over a property.
The maximum rate of stormwater runoff from a specific storm
event.
The computer-based hydrologic modeling technique adapted
to each watershed for the Act 167 plans. The model was calibrated
to reflect actual flow values by adjusting key model input parameters.
An individual, partnership, public or private association
or corporation, firm, trust, estate, municipality, 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.
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 Pa. Code § 92a.2.
The determination of the depth to bedrock, the depth to the
seasonal high water table and the soil permeability for a possible
infiltration location on a site through the use of published data
and on-site surveys. In carbonate bedrock areas, the location of special
geologic features must also be determined along with the associated
buffer distance to the possible infiltration area. See Appendix G.[1]
The specific area of land where any regulated activities
in the municipality are planned, conducted, or maintained.
A person who owns or operates a public water system.
A system which provides water to the public for human consumption
which has at least 15 service connections or regularly serves an average
of at least 25 individuals daily at least 60 days out of the year.
(See 25 Pa. Code Chapter 109.)
A licensed professional geologist or a licensed professional
engineer who has a background or expertise in geology or hydrogeology.
Any person licensed by the Pennsylvania Department of State
or otherwise qualified by law to perform the work required by this
chapter.
A method of peak runoff calculation using a standardized
runoff coefficient (rational "c"), acreage of tract and rainfall intensity
determined by return period and by the time necessary for the entire
tract to contribute runoff. The rational method formula is stated
as follows: Q = ciA, where "Q" is the calculated peak flow rate in
cubic feet per second, "c" is the dimensionless runoff coefficient
(see Appendix C[2]), "i" is the rainfall intensity in inches per hour, and
"A" is the area of the tract in acres.
Any of the natural or man-made runoff conveyance channels
used for watershed runoff modeling purposes to connect the subareas
and transport flows downstream.
The portion of the water quality volume (WQv) used to maintain groundwater recharge rates at development sites. (See § 26-16.)
Any earth disturbance activities or any activities that involve the alteration or development of land in a manner that may affect stormwater runoff, governed by this chapter as specified in § 26-5.
Activity involving earth disturbance subject to regulation
under 25 Pa. Code Chapter 92, 25 Pa. Code Chapter 102, or the Clean
Streams Law.[3]
The percentage of the predevelopment peak rate of runoff
for a development site to which the post-development peak rate of
runoff must be controlled to avoid peak flow increases throughout
the watershed.
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).
A permanent area of trees and shrubs located adjacent to
streams, lakes, ponds and wetlands.
Earth disturbance activities within the existing road cross
section such as grading and repairing existing unpaved road surfaces,
cutting road banks, cleaning or clearing drainage ditches and other
similar activities.
Any part of precipitation that flows over the land.
Soils or other materials transported by surface water as
a product of erosion.
Chambers which provide storage below the outlet in a storm
inlet to collect sediment, debris and associated pollutants, typically
requiring periodic cleanout.
An area of excavated earth filled with loose stone or similar
material and 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.
Stormwater runoff flowing in a thin layer over the ground
surface.
A method of runoff computation developed by NRCS which is
based upon relating soil type and land use/cover to a runoff parameter
called a "curve number."
Carbonate bedrock features, including but not limited to
closed depressions, existing sinkholes, fracture traces, lineaments,
joints, faults, caves, pinnacles, and geologic contacts between carbonate
and noncarbonate bedrock which may exist and must be identified on
a site when stormwater management BMPs are being considered.
A program that identifies procedures for preventing and,
as needed, cleaning up potential spills and makes such procedures
known and the necessary equipment available to appropriate personnel.
The regulatory requirements to protect, maintain, reclaim,
and restore water quality under Title 25 of the Pennsylvania Code
(Chapters 93 and 96) and the Clean Streams Law,[4] including:
Each stream segment in Pennsylvania has a designated use, such
as "cold water fishes" or "potable water supply," which is listed
in Chapter 93. These uses must be protected and maintained, under
state regulations.
"Existing uses" are those attained as of November 1975, regardless
of whether they have been designated in Chapter 93. Regulated earth
disturbance activities must be designed to protect and maintain existing
uses and maintain the level of water quality necessary to protect
those uses in all streams, and to protect and maintain water quality
in special protection streams.
Water quality involves the chemical, biological and physical
characteristics of surface water bodies. After regulated earth disturbance
activities are complete, these characteristics can be impacted by
addition of pollutants such as sediment, and changes in habitat through
increased flow volumes and/or rates as a result of changes in land
surface area from those activities. Therefore, permanent discharges
to surface waters must be managed to protect the stream bank, streambed
and structural integrity of the waterway to prevent these impacts.
A method of routing or moving an inflow hydrograph through
a reservoir or detention structure. The method solves the mass conservation
equation to determine an outflow hydrograph as it leaves the storage
facility.
Areas which lack adequate stormwater collection and/or conveyance
facilities and which present a hazard to persons or property. These
areas are either documented in Appendix B[5] of this chapter or identified by the municipality or Municipal
Engineer.
A system of pipes or other conduits which carries intercepted
surface runoff, street water and other wash waters, or drainage, but
excludes domestic sewage and industrial wastes.
Drainage runoff from the surface of the land resulting from
precipitation or snow or ice melt.
Any number of structural mechanisms such as multichamber
catch basins, sand/peat filters, sand filters, and so forth which
are installed to intercept stormwater flow and remove pollutants prior
to discharge. Typically, these systems require periodic maintenance
and cleanout.
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 plan for managing stormwater adopted by Lehigh County,
produced by the Lehigh Valley Planning Commission, and known as the
"Global Act Stormwater Management Plan Water Quality Update," as required
by the Act of October 4, 1978, P.L. 864 (Act 167), as amended, and
known as the "Stormwater Management Act."[6]
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, adopted by Lehigh County for
the Whitehall Township Watershed, as required by the Act of October
4, 1978, P.L. 864 (Act 167), as amended, and known as the "Storm Water
Management Act." "Stormwater management site plan" will be designated
as "SWM site plan" throughout this chapter.
A watercourse.
The smallest unit of watershed breakdown for hydrologic modeling
purposes for which the runoff control criteria have been established
in the stormwater management plan.
As defined in the Pennsylvania Municipalities Planning Code,[7] Act of July 31, 1968, P.L. 805, No. 247, 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.
A low-lying stretch of land which gathers or carries surface
water runoff. See also "vegetated swale."
The report written by Cahill Associates that addresses the
feasibility of infiltration in carbonate bedrock areas in the Little
Lehigh Creek Watershed. The report is available at the Lehigh Valley
Planning Commission offices.
Racks, screens or other similar devices installed in a storm
drainage system to capture coarse pollutants (trash, leaves, etc.).
United States Department of Agriculture.
Gently sloping areas that convey stormwater as sheet flow
over a broad, densely vegetated earthen area, possibly coupled with
the use of level spreading devices. Vegetated buffers should be situated
on minimally disturbed soils, have low-flow velocities and extended
residence times.
Vegetated systems installed on roofs that generally consist
of a waterproof layer, a root-barrier, drainage layer (optional),
growth media, and suitable vegetation. Vegetated roofs store and eventually
evapotranspirate the collected rooftop rainfall; overflows may be
provided for larger storms.
Vegetated earthen channels designed to convey stormwater. These
swales are not considered to be water quality BMPs.
Broad, shallow, densely vegetated, earthen channels designed
to treat stormwater while slowly infiltrating, evapotranspirating,
and conveying it. Swales should be gently sloping with low flow velocities
to prevent erosion. Check dams may be added to enhance performance.
Any number of commercially available devices that are inserted
into storm inlets to capture sediment, oil, grease, metals, trash,
debris, etc.
The volume needed to capture and treat 90% of the average annual rainfall volume. (See § 26-17.)
Any channel of conveyance of surface water having 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 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, and similar areas.
[1]
Editor's Note: Appendix G is on file in the Township
offices.
[2]
Editor's Note: Appendix C is on file in the Township
offices.
[3]
Editor's Note: See 35 P.S. § 691.1 et seq.
[4]
Editor's Note: See 35 P.S. § 691.1 et seq.
[5]
Editor's Note: Appendix B is on file in the Township
offices.
[6]
Editor's Note: See 32 P.S. § 680.1 et seq.
[7]
Editor's Note: See 53 P.S. § 10101 et seq.
