For the purpose of this chapter, certain terms and words used
herein shall be interpreted as follows:
A.Â
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.
B.Â
The words "includes" or "including" shall not limit the term to the
specific example, but are intended to extend its meaning to all other
instances of like kind and character.
C.Â
The word "person" includes an individual, firm, association, organization,
partnership, trust, company, corporation, or any other similar entity.
D.Â
The words "shall" and "must" are mandatory; the words "may" and "should"
are permissive.
E.Â
The words "used or occupied" include the words "intended, designed,
maintained, or arranged to be used, occupied or maintained."
A.Â
ACCELERATED EROSION
AGRICULTURAL ACTIVITIES
ALTERATION
APPLICANT
BEST MANAGEMENT PRACTICES (BMPs)
CHANNEL EROSION
CISTERN
CONSERVATION DISTRICT
CULVERT
DAM
DESIGN STORM
DESIGNEE (DESIGNATED REPRESENTATIVE)
DETENTION BASIN
DETENTION VOLUME
DEVELOPER and/or SUBDIVIDER
DEVELOPMENT SITE - (SITE)
DISTURBED AREA
DOWNSLOPE PROPERTY LINE
DRAINAGE CONVEYANCE FACILITY
DRAINAGE PLAN
DRAINAGEWAY
EARTH DISTURBANCE ACTIVITY
ENGINEER
EROSION
EROSION AND SEDIMENT POLLUTION CONTROL PLAN
EXCEPTIONAL VALUE WATERS
EXISTING CONDITIONS
FEMA
FLOOD
FLOOD FRINGE
FLOOD HAZARD BOUNDARY
FLOODPLAIN
FLOODWAY
FOREST MANAGEMENT/TIMBER OPERATIONS
FREEBOARD
GRADE
(TO) GRADE
GROUNDWATER RECHARGE
HEC-HMS MODEL CALIBRATED
HIGH QUALITY WATERS
HYDROLOGIC SOIL GROUP (HSG)
IMPAIRED WATERWAY
IMPERVIOUS SURFACE (IMPERVIOUS AREA)
IMPOUNDMENT
IMPROVEMENTS
INFILTRATION STRUCTURES
INLET
KARST
LAND DEVELOPMENT (DEVELOPMENT)
(1)Â
(2)Â
(3)Â
LAND DISTURBANCE
LOT
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
PERFORMANCE GUARANTEE
PERSON
PERVIOUS AREA
PIPE
PLAN, FINAL
PLAN, PRELIMINARY
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
SCS
SEDIMENT
SEDIMENT BASIN
SEDIMENT POLLUTION
SEDIMENTATION
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)
TOWNSHIP
USDA
WAIVER
WATERCOURSE
WATERS OF THE COMMONWEALTH
WATERSHED
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 Washington County Conservation District. The Washington
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 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."
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.
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.
The documentation of the stormwater management system, if
any, to be used for a given development site, the contents of which
are established in this chapter; stormwater management plan and report
package.
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.
A person, partnership or corporation which shall have a license
issued by the Commonwealth of Pennsylvania as a "professional engineer"
and which shall prepare all stormwater management plans and reports
required under this chapter, and which shall seal with the professional
seal all plans and documents submitted under this chapter.
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 100-year floodplain outside
of the floodway 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 100-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).
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
Map as being a special flood hazard area.
The channel of the watercourse and those portions of the
adjoining floodplains that are reasonably required to carry and discharge
the 100-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 100-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 pond or basin.
A slope, usually of a road, channel or natural ground, specified
in percent and shown on plans as specified herein.
To finish the surface of a roadbed, top of embankment or
bottom of excavation.
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 Washington 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 US 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.
Surface water segment found not attaining any one of the
defined uses and is included on the Stream Integrated List represents
stream assessments in an integrated format for the Clean Water Act
Section 303(d) listing.[1]
A surface that prevents the infiltration of water into the
ground. Impervious surfaces (or areas) include, but are 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.
Those physical additions and changes to the land that may
be necessary to produce usable and desirable lots.
A structure designed to direct runoff into the ground (e.g.,
french drains, seepage pits, seepage trench, 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.
A type of topography or landscape characterized by surface
depressions, sinkholes, rock pinnacles/uneven bedrock surface, steep-sided
hills, underground drainage and caves. Karst is formed on carbonate
rocks, such as limestone or dolomites, and sometimes gypsum.
The improvement of one lot or two or more contiguous lots, tracts
or parcels of land for any purpose involving a) a group of two or
more buildings; or b) 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.[2]
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.
A designated parcel, tract or area of land established by
a plan or otherwise as permitted by law and to be used, developed
or built upon as a unit.
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.
Low impact development 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 Washington 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.
Robinson Township, Washington County, Pennsylvania.
The federal government's system for issuance of permits
under the Clean Water Act,[3] which is delegated to PADEP in Pennsylvania.
Precipitation Frequency Atlas of the United States, Atlas
14, Volume 2, US Department of Commerce, National Oceanic and Atmospheric
Administration, National Weather Service, Hydrometeorological Design
Studies Center, Silver Spring, Maryland (2004), or latest revision.
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.
Any security which may be accepted in lieu of a requirement
that certain improvements be made before the Township gives final
approval of a plan, including performance bonds, escrow agreements,
letters of credit, and any other collateral or surety agreements.
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.
A complete and exact subdivision or land development plan (including all required supplementary data), prepared for official recording of a major subdivision, to define property rights and proposed street and other improvements, prepared by a registered surveyor, all as more fully set forth in Chapter 380, Subdivision and Land Development, of the Code of Robinson Township.
A tentative subdivision or land development plan (including all required supplementary data), in lesser detail than a final plan, showing, among other things, topographical data and approximate proposed street and lot layout as a basis for consideration of a major subdivision prior to preparation of a final plan, all as more fully set forth in Chapter 380, Subdivision and Land Development, of the Code of Robinson Township.
The Planning Commission of Robinson Township.
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 § 92a.2.
[Amended at time of adoption of Code (see Ch. 1, General
Provisions, Art. I)]
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 Oceanic and Atmospheric Administration (NOAA).
The specific area of land where any regulated activities
in the Township 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 this
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.
Activity involving earth disturbance subject to regulation
under 25 Pa. Code Chapter 92a, Chapter 102, or the Clean Streams Law.[4]
[Amended at time of adoption of Code (see Ch. 1, General
Provisions, Art. I)]
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 4% chance).
A vegetated area bordering perennial and intermittent streams
and wetlands, that serves as a protective filter to help protect streams
and wetlands from the impacts of adjacent land uses.
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.
U.S. Department of Natural Resources, Soil Conservation Service
(now USDNR).
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 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.
The process by which mineral or organic matter is accumulated
or deposited by the movement of water.
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 Natural Resources
Conservation Service (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.[5]
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.
Drainage 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 Washington County Stormwater Management Plan for managing
stormwater runoff in Washington County, as required by the Act of
October 4, 1978, P.L. 864 (Act 167), and known as the "Storm Water
Management Act."[6]
The plan prepared by the applicant or his representative
indicating how stormwater runoff will be managed on 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).[7]
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.
Robinson Township, Washington County.
The United States Department of Agriculture.
Intentional relinquishing of a specific right, claim or privilege
by the governing body.
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.
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.
Region or area drained by a river, watercourse, or other
surface water, whether natural or artificial.
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, the Pennsylvania
Coastal Zone Management Plan and a wetland area designated by a river
basin commission. This definition is used by the United States Environmental
Protection Agency and the United States Army Corps of Engineers.)
[1]
Editor's Note: See 33 U.S.C § 1313(d).
[2]
Editor's Note: See 53 P.S. § 10503(1.1).
[3]
Editor's Note: See 33 U.S.C. § 1251 et seq.
[4]
Editor's Note: See 35 P.S. § 691.1 et seq.
[5]
Editor's Note: See 35 P.S. § 691.1 et seq.
[6]
Editor's Note: See 32 P.S. § 680.1 et seq.
[7]
Editor's Note: See 53 P.S. § 10101 et seq.
B.Â
Acronyms:
|
BMPs
|
—
|
Best management practices
|
|
CN
|
—
|
Curve number
|
|
E&S
|
—
|
Erosion and sedimentation
|
|
EV
|
—
|
Exceptional value
|
|
FEMA
|
—
|
Federal Emergency Management Agency
|
|
HEC-HMS
|
—
|
Hydrologic Engineering Center Hydrologic Modeling System
|
|
HQ
|
—
|
High quality
|
|
HSG
|
—
|
Hydrologic soil group
|
|
LID
|
—
|
Low impact development
|
|
MPC
|
—
|
Pennsylvania Municipalities Planning Code, Act of July 31, 1968,
P.L. 805, No. 247[8]
|
|
MS4
|
—
|
Municipal separate storm sewer system
|
|
NPDES
|
—
|
National Pollutant Discharge Elimination System
|
|
NOAA
|
—
|
US Department of Commerce, National Oceanic and Atmospheric
Administration
|
|
NRCS
|
—
|
Natural Resource Conservation Service
|
|
O&M
|
—
|
Operation and maintenance
|
|
PADEP
|
—
|
The Pennsylvania Department of Environmental Protection
|
|
PennDOT
|
—
|
Pennsylvania Department of Transportation
|
|
PMF
|
—
|
Probable maximum flood
|
|
SWM
|
—
|
Stormwater management
|
|
Tc
|
—
|
Time of concentration
|
|
USDA
|
—
|
United States Department of Agriculture
|
[8]
Editor's Note: See 53 P.S. § 10101 et seq.
