Definitions. Unless otherwise expressly stated, the following words
shall, for the purpose of this chapter, have the meanings herein stated:
ACCELERATED EROSION
The removal of the surface of the land, through the combined
action of human activities and the natural processes, at a rate greater
than would occur because of the natural process alone.
APPLICANT
A landowner, developer or other person who has filed an application
for approval to engage in any earth disturbance activity regulated
by the provisions of this chapter at a project site in the Township.
BASINS
(1)
DETENTION BASINSBasins designed for temporary storage of stormwater to reduce peak discharges. They are characterized by shorter detention periods and are normally dry, except for short periods following a storm event. Stored stormwater is released at a controlled rate.
(2)
RETENTION BASINSBasins designed for impoundment of stormwater to reduce peak discharges. They are usually wet continually but are designed to store excess stormwater above the normal pool elevation. The excess stormwater is released at a controlled rate.
BEST MANAGEMENT PRACTICE (BMP)
Activities, facilities, designs, measures or procedures used
to manage stormwater impacts from earth disturbance activities associated
with land development and construction activities, to meet state water
quality requirements, to promote groundwater recharge and to otherwise
meet the purposes of this chapter. BMPs include, but are not limited
to, infiltration, filter strips, low- impact design, bioretention,
wet ponds, permeable paving, grassed swales, forested buffers, sand
filters and detention basins.
BUILDING PERMIT
A permit issued by the Building Inspector pursuant to provisions
of the Falls Township Building Code for the construction, erection,
or alteration of a structure or building.
CUT
An excavation; the difference between a point on original
ground and a designated point of lower elevation on the final grade;
also, the material removed in excavation.
DEP
The Pennsylvania Department of Environmental Protection.
DEVELOPER
A person that seeks to undertake any earth disturbance activities
regulated by the provisions of this chapter at a project site in the
Township.
DEVELOPMENT
See "earth disturbance activity." The term includes redevelopment.
DEVELOPMENT SITE
The specific tract of land where any earth disturbance activities
in the Township are planned, conducted or maintained.
DISCHARGE
The outflow of water, silt or other mobile substances passing
along a conduit, watercourse or channel or released from any type
of detention or stormwater management feature.
EARTH DISTURBANCE ACTIVITY
A construction or other human activity which disturbs the
surface of the land, including but not limited to clearing and grubbing;
certain paving, embankments, road maintenance, filling, stripping,
grading, regrading; cutting, removal of vegetation or natural ground
covers; excavation, digging, earthmoving; the moving, depositing,
stockpiling or storing of soil, rock or earth materials; or land development
undertaken by an individual on private or public property as herein
set forth.
EARTHMOVING
An activity resulting in the movement of earth or stripping
of vegetative cover from the earth.
EROSION
The processes by which the surface of the land, including
channels, is worn by water, wind or chemical action.
EXCAVATION
Any act by which earth, sand, gravel, rock or any other similar
materials is cut into, dug, quarried, uncovered, removed, displaced,
relocated, or bulldozed and shall include the conditions resulting
therefrom.
FILL
(1)
The act by which earth, sand, gravel, rock or any other material
is deposited in a new location above the natural surface of the ground
or on top of the strip surface and shall include the conditions resulting
therefrom.
(2)
The difference in elevation between a point on the original
ground and a designated point of final elevation in the final grade.
(3)
The material used to make a fill.
FLOODPLAIN DISTRICT
Shall include areas adjoining any watercourse, drainage course or body of water subject to periodic inundation or overflow and subject to regulations pursuant to Chapter
131, Floodplain Management, of the Falls Township Code.
GRADE
The elevation of the existing ground surface or the finished
elevation at the location of any proposed excavation or fill.
IMPERVIOUS GROUND COVER
A surface that prevents the infiltration of water into the
ground. All buildings, parking areas, driveways, roads, sidewalks,
and any areas in concrete, asphalt and packed stone shall be considered
impervious surfaces within this definition. Any surface areas designed
to initially be gravel or crushed stone shall be assumed to be impervious
surfaces. In addition, other areas determined by the Township Engineer
to be impervious within the meaning of this definition will also be
classed as impervious surfaces.
LAND DEVELOPMENT
As defined in §
191-5, "Definitions," of Chapter
191 of the Falls Township Code, entitled "Subdivision and Land Development."
NPDES
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.
OUTFALL
"Point source" as described in 40 CFR 122.2, at the point
where the Township's storm sewer system discharges to surface waters
of the commonwealth.
PERSON
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.
POINT SOURCE
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 § 93.1.
PROJECT SITE
The specific area of land where any earth disturbance activities
regulated by the provisions of this chapter in the Township are planned,
conducted or maintained.
RATIONAL METHOD
The Rational Equation is as follows:
Where:
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Q
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=
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Maximum expected discharge in cubic feet per second
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C
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=
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Runoff factor expressed as a percent of the total water falling
on an area that is dependent upon the land cover of the watershed
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I
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=
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The rate of rainfall from the time of concentration of the drainage
area in inches per hour for a given storm frequency
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A
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=
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Drainage area expressed in acres
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REDEVELOPMENT
Earth disturbance activities on land which has previously
been disturbed or developed.
REGULATED EARTH DISTURBANCE ACTIVITY
Earth disturbance activity of 1,000 square feet or more,
or any alteration project that would divert the existing stormwater
runoff patterns on the site. This includes earth disturbance on any
portion of, part of, or during any stage of, a larger common plan
of development.
RUNOFF
That portion of the precipitation on a drainage area that
is not absorbed and, therefore, is discharged from the area. Types
include surface runoff, surface groundwater runoff and seepage.
RUNOFF FROM A FULLY DEVELOPED AREA UPSTREAM
The surface water runoff that can be reasonably anticipated
upon maximum development of the area of the watershed upstream from
the subject tract, as permitted by prevailing zoning or the Township
Comprehensive Plan.
SEDIMENTATION
The process by which mineral or organic matter is accumulated
or deposited by moving wind, water or gravity. Once this matter is
deposited, or remains suspended in water, it shall be referred to
as "sediment."
SEPARATE STORM SEWER SYSTEM
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.
SITE
A lot, tract or parcel of land, or a series of lots, tracts
or parcels of land, joined together where grading work is continuous
and performed at the same time.
SLOPE
The face of an embankment or cut section; any ground where
surface makes an angle with the plane of the horizon. Slopes shall
be expressed as a ratio of horizontal distance to vertical or in a
percentage based upon vertical difference in feet per 100 feet of
horizontal distance.
SOIL COVER COMPLEX METHOD
A mathematical formula to compute runoff developed by the
Soil Conservation Service of the U.S. Department of Agriculture, which
provides for accurate consideration of the effect of applied conservation
measures on runoff rates and volume.
SOIL STABILIZATION
Chemical, physical, or structural treatment of a mass of
soil to increase or maintain stability or otherwise improve its engineering
properties.
STATE WATER QUALITY REQUIREMENTS
As defined under state regulations, protection of designated
and existing uses (per 25 Pa. Code Chapters 93 and 96), including:
(1)
Each stream segment in Pennsylvania has a designated use, such
as "cold-water fishery" or "potable water supply," which are listed
in Chapter 93. These uses must be protected and maintained, under
state regulations.
(2)
Existing uses are those attained as of November 1975, regardless
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.
(3)
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 streambank, streambed
and structural integrity of the waterway, to prevent these impacts.
STEEP SLOPES
Land grades in excess of 8% and subject to regulation pursuant to §
209-48.3, Natural Resource Protection, of Chapter
209 of the Falls Township Code, entitled "Zoning."
STORMWATER
The surface runoff generated by precipitation reaching the
ground surface.
STORMWATER MANAGEMENT SYSTEM
Facilities used for conveying to, through or from a drainage
area to a point of final outlet, including but not limited to the
following: conduits and pertinent features, canals, channels, swales,
ditches, streams, culverts, streets, ponds and basins.
STRIPPING
The removal of vegetation, including trees, and/or topsoil.
The normal process of gardening or property maintenance shall be excluded
from this definition.
SUBDIVISION
As defined in §
191-5, Definitions, of Chapter
191 of the Falls Township Code, entitled "Subdivision and Land Development."
SURFACE WATERS OF THE COMMONWEALTH
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 water, or parts thereof, whether natural or artificial, within
or on the boundaries of this commonwealth.
TIME OF CONCENTRATION
The interval of time required for water to travel from the
most hydraulically distant point of the drainage area to a given point
(point of reference).
TOWNSHIP
Falls Township, Bucks County, Pennsylvania.
TOWNSHIP ENGINEER
A professional engineer registered in the State of Pennsylvania
and designated by the Board of Supervisors to perform the duties of
engineer as herein specified.
TOWNSHIP SOLICITOR
A licensed attorney designated by the Board of Supervisors
to perform the duties of solicitor as herein specified.
WATERCOURSE
A channel or conveyance of surface water, such as a stream
or creek, having defined bed and banks, whether natural or artificial,
with perennial, intermittent, or base flow.
WATERSHED
Region or area drained by a river, watercourse or other body
of water, whether natural or artificial.
WETLANDS
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 any wetland area designated by a
river basin commission.