For the purposes of this chapter, certain terms and words used herein shall be interpreted as follows:
A. 
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. 
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.
C. 
The word "person" includes an individual, firm, association, organization, partnership, trust, company, corporation, unit of government, or any other similar entity.
D. 
The words "shall" and "must" are mandatory; the words "may" and "should" are permissive.
E. 
The words "used" or "occupied" include the words "intended, designed, maintained, or arranged to be used, occupied or maintained."
As used in this chapter, the following terms shall have the meanings indicated:
ACCELERATED EROSION
The removal of the surface of the land through the combined action of man's activity and the natural processes of a rate greater than would occur because of the natural process alone.
AGRICULTURAL ACTIVITIES
The work of producing crops and raising livestock including tillage, plowing, disking, harrowing, pasturing and installation of conservation measures. Construction of new buildings or impervious area is not considered an agricultural activity.
ALTERATION
As applied to land, a change in topography as a result of the moving of soil and rock from one location or position to another; also the changing of surface conditions by causing the surface to be more or less impervious; land disturbance.
APPLICANT
A person who has filed an application for approval to engage in any regulated activity defined in § 430-301 of this chapter.[1]
AS-BUILT DRAWINGS
Engineering or site drawings maintained by the contractor as he constructs the project and upon which he documents the actual locations of the building components and changes to the original contract documents. These documents, or a copy of same, are turned over to the Township Engineer at the completion of the project, and shall be submitted in an electronic format of such type as is designated by the Township.
BANKFULL
The channel at the top-of-bank, or point from where water begins to overflow onto a floodplain.
BASEFLOW
Portion of stream discharge derived from groundwater; the sustained discharge that does not result from direct runoff or from water diversions, reservoir releases, piped discharges, or other human activities.
BIORETENTION
A stormwater retention area that utilizes woody and herbaceous plants and soils to remove pollutants before infiltration occurs.
BMP (BEST MANAGEMENT PRACTICE)
Methods, measures or practices used to prevent or reduce surface runoff and/or water pollution, including but not limited to structural and nonstructural stormwater management practices and operation and maintenance procedures. See also "nonstructural best management practice (BMP)."
BMP OPERATIONS AND MAINTENANCE PLAN
A plan prepared by the developer or his representative indicating how stormwater runoff will be managed at the particular site of interest according to this chapter.
BUFFER
The area of land immediately adjacent to any natural watercourse, measured perpendicular to and horizontally from the top-of-bank on both sides of a stream (see "top-of-bank").
CHANNEL
An open drainage feature through which stormwater flows. Channels include, but shall not be limited to, natural and man-made drainageways, swales, streams, ditches, canals and pipes flowing partly full.
CHANNEL EROSION
The widening, deepening or headward cutting of channels and waterways caused by stormwater runoff or bankfull flows.
CISTERN
An underground reservoir or tank for storing rainwater.
CONSERVATION DISTRICT
The Bucks County Conservation District.
CULVERT
A structure with its appurtenant works which carries water under or through an embankment or fill.
DAM
A man-made barrier, together with its appurtenant works, constructed for the purpose of impounding or storing water or another fluid or semifluid. A dam may include a refuse bank, fill or structure for highway, railroad or other purposes which impounds or may impound water or another fluid or semifluid.
DEPARTMENT
The Pennsylvania Department of Environmental Protection.
DESIGN PROFESSIONAL (QUALIFIED)
A Pennsylvania registered professional engineer, registered landscape architect or registered professional land surveyor trained to develop stormwater management plans.
DESIGN STORM
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.
DESIGNEE
The agent or representative of Middletown Township responsible for the administration, review and/or enforcement of any provisions of this chapter by appointment, resolution, contract or memorandum of understanding.
DETENTION BASIN
An impoundment designed to collect and retard stormwater runoff by temporarily storing the runoff and releasing it at a predetermined rate. Detention basins are designed to drain completely soon after a rainfall event and become dry until the next rainfall event.
DETENTION DISTRICT
Those subareas of a watershed in which some type of detention is required to meet the plan requirements and the goals of Act 167.[2]
DEVELOPER
A person that seeks to undertake any regulated earth disturbance activities at a project site in the Township.
DEVELOPMENT
Any human-induced change to improved or unimproved real estate, whether public or private, including but not limited to land development, construction, installation or expansion of a building or other structure, land division, street construction, drilling and site alteration, such as embankments, dredging, grubbing, grading, paving, parking or storage facilities, excavation, filling, stockpiling or clearing. As used in this chapter, development encompasses both new development and redevelopment.
DEVELOPMENT SITE
The specific tract or parcel of land where any regulated activity set forth in § 430-301 is planned, conducted or maintained.[3]
DIFFUSED DRAINAGE DISCHARGE
Drainage discharge that is not confined to a single point location or channel, including sheet flow or shallow concentrated flow.
DISCHARGE
To release water from a project, site, aquifer, drainage basin or other point of interest (verb); the rate and volume of flow of water such as in a stream, generally expressed in cubic feet per second (noun). See also "peak discharge."
DISCHARGE POINT
The point of discharge for a stormwater facility.
DISTURBED AREAS
Unstabilized land area where an earth disturbance activity is occurring or has occurred.
DITCH
A man-made waterway constructed for irrigation or stormwater conveyance purposes.
DOWNSLOPE PROPERTY LINE
That portion of the property line of the lot, tract or parcels of land being developed, located such that overland or pipe flow from the project site would be directed towards it by gravity.
DRAINAGE CONVEYANCE FACILITY
A stormwater management facility designed to transport stormwater runoff that includes channels, swales, pipes, conduits, culverts and storm sewers.
DRAINAGE EASEMENT
A right granted by a landowner to a grantee, allowing the use of private land for stormwater management purposes.
DRAINAGE PERMIT
A permit issued by the Township after the drainage plan has been approved.
DRAINAGE PLAN
The documentation of the stormwater management system, if any, to be used for a given development site, the contents of which are established in § 430-302.
EARTH DISTURBANCE ACTIVITY
A construction or other human activity which disturbs the surface of 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.
EARTH DISTURBANCE PERMIT
A permit issued by the Township Department of Licenses and Inspections for any earth disturbance activity.
EMERGENCY SPILLWAY
A conveyance area that is used to pass peak discharge greater than the maximum design storm controlled by the stormwater facility.
ENCROACHMENT
A structure or activity that changes, expands or diminishes the course, current or cross section of a watercourse, floodway or body of water.
EROSION
The process by which the surface of the land, including water/stream channels, is worn away by water, wind or chemical action.
EROSION AND SEDIMENT CONTROL PLAN
A plan that is designed to minimize accelerated erosion and sedimentation. Said plan must be submitted to and approved by the appropriate conservation district before construction can begin.
ERSAM
Existing resource and site analysis map.
EXCAVATION
Any act by which earth, sand, gravel, rock or any other similar material is cut into, dug, quarried, uncovered, removed, displaced or relocated and shall include the conditions resulting therefrom.
EXCEPTIONAL VALUE WATERS
Surface waters of high quality which satisfy Pennsylvania Code Title 25, Environmental Protection, Chapter 93, Water Quality Standards, § 93.4b(b) (relating to antidegradation).
EXISTING CONDITIONS
The initial condition of a project site prior to its proposed alteration. If the initial condition of the site is undeveloped land, the land use shall be considered as "meadow" unless the natural land cover is proven to generate lower curve numbers or Rational "C" value, such as forested lands.
FINANCIAL SECURITY
An irrevocable letter of credit with a federal or commonwealth lending institution, a corporate surety bond from a bonding company authorized to do business within the commonwealth or such other guaranty approved by the Solicitor in an amount approved by the Township Engineer.
FLOOD
A temporary condition of partial or complete inundation of land areas from the overflow of streams, rivers, and other waters of this commonwealth.
FLOODPLAIN
Any land area susceptible to inundation by water from any natural source or as delineated by applicable Department of Housing and Urban Development, Federal Insurance Administration Flood Hazard Boundary Map as being a special flood hazard area.
FLOODPLAIN SOILS
Soils in areas subject to periodic flooding and listed in the Soil Survey of Bucks and Philadelphia Counties, Pennsylvania, United States Department of Agriculture, Soil Conservation Service, July 1975, as being "in the floodplain" or "subject to flooding." Floodplain soils include but are not limited to:
A. 
Alluvial land.
B. 
Alton gravelly loam, flooded.
C. 
Bowmansville silt loam.
D. 
Hatboro silt loam.
E. 
Marsh.
F. 
Pope loam.
G. 
Rowland silt loam.
FLOODWAY
The channel of a watercourse and those portions of the adjoining floodplains, which 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 from the top-of-bank.
FLUVIAL GEOMORPHOLOGY
The study of landforms associated with river channels and the processes that form them.
FOREST MANAGEMENT/TIMBER OPERATIONS
Planning and associated 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 and reforestation.
FREEBOARD
A vertical distance between the elevation of the design high-water and the top of a dam, levee, tank, basin, swale or diversion berm. The space is required as a safety margin in a pond or basin.
GRADE
A slope, usually of a road, channel or natural ground, specified in percent and shown on plans as specified herein (noun); to finish the surface of a roadbed, the top of an embankment, or the bottom of excavation (verb).
GRASSED WATERWAY
A natural or man-made waterway, usually broad and shallow, covered with erosion-resistant grasses, used to convey surface water.
GROUND COVER
Low-growing plant materials planted and growing in such a manner so as to conceal the earth surface.
GROUNDWATER
Water beneath the earth's surface that supplies wells and springs, and is often between saturated soil and rock.
GROUNDWATER RECHARGE
The replenishment of existing natural underground water supplies from rain or overland flow.
HEC-HMS
The United States Army Corps of Engineers, Hydrologic Engineering Center (HEC) - Hydrologic Modeling System (HMS). This model was used to model the Neshaminy and Little Neshaminy Creeks watershed during the Act 167 Plan development and was the basis for the standards and criteria of this chapter.
HIGH QUALITY WATERS
Surface waters having quality which exceeds levels necessary to support propagation of fish, shellfish and wildlife and recreation in and on the water by satisfying Pennsylvania Code, Title 25, Environmental Protection, Chapter 93, Water Quality Standards, § 93.4b(a).
HOT SPOTS
Areas where land use or activities generate highly contaminated runoff, with concentrations of pollutants in excess of those typically found in stormwater.
HYDROGRAPH
A graph representing the discharge of water versus time for a selected point in the drainage system.
HYDROLOGIC REGIME
The hydrologic cycle or balance that sustains quality and quantity of stormwater, baseflow, storage and groundwater supplies under natural conditions.
HYDROLOGIC SOIL GROUP
A classification of soils by the Natural Resources Conservation Service, formerly the Soil Conservation Service, into four runoff potential groups. The groups range from A soils, which are very permeable and produce little runoff, to D soils, which are not very permeable and produce much more runoff.
HYETOGRAPH
A graphical representation of average rainfall, rainfall excess rates, or volumes over specified areas during successive units of time during a storm.
IMPERVIOUS SURFACE
A surface that prevents the infiltration of water into the ground. Impervious surfaces include, but are not limited to, streets, sidewalks, pavement roofs or driveway areas. Any surface areas designed to be gravel or crushed stone shall be regarded as impervious surfaces.
IMPOUNDMENT
A retention or detention basin designed to retain stormwater runoff and release it at a controlled rate.
INFILL
Development that occurs on smaller parcels that remain undeveloped but are within or in very close proximity to urban or densely developed areas. Infill development usually relies on existing infrastructure and does not require an extension of water, sewer or other public utilities.
INFILTRATION
Movement of surface water into the soil, where it is absorbed by plant roots, evaporated into the atmosphere, or percolated downward to recharge groundwater.
INFILTRATION STRUCTURES
A structure designed to direct runoff into the underground water (e.g., french drains, seepage pits, or seepage trenches).
INFILTRATION TEST
An in-situ test performed in accordance with the current standards as stated in the Pennsylvania Code, Title 25, Environmental Protection, Chapter 73 (Standards for On-lot Sewage Treatment Facilities) by a qualified soil scientist or geotechnical engineer to determine the permeability or percolation capacity of an area for use in designing any infiltration BMPs. The number and locations of infiltration tests shall be in accordance with Pennsylvania Stormwater Best Management Practices Manual (Draft January 2005, Section 6.9, Protocol 1).
INLET
The upstream end of any structure through which water may flow.
INTERMITTENT STREAM
A stream that flows only part of the time. Flow generally occurs for several weeks or months in response to seasonal precipitation or groundwater discharge.
LAND DEVELOPMENT
Any of the following activities:
A. 
The improvement of one lot or two or more contiguous lots, tracts or parcels of land for any purpose involving:
(1) 
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
(2) 
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.
B. 
A subdivision of land;
C. 
Development in accordance with Section 503(1.1) of the Pennsylvania Municipalities Planning Code.[4]
D. 
The following shall not be considered a land development:
(1) 
The conversion of an existing single-family detached dwelling or single-family semidetached dwelling into not more than three residential units, unless such units are intended to be a condominium;
(2) 
The addition of an accessory building, including farm building, on a lot or lots, subordinate to an existing principal building; or
(3) 
The addition or conversion of buildings or rides within the confines of an enterprise which would be considered an amusement park. For the purposes of this exemption, an amusement park is defined as a tract or area used principally as a location for permanent amusement structures or rides. This exclusion shall not apply to newly acquired acreage by an amusement park until initial plans for the expanded area have been approved by the municipality.
LIMITING ZONE
A soil horizon or condition in the soil profile or underlying strata that includes one of the following:
A. 
A seasonal high-water table, whether perched or regional, determined by direct observation of the water table or indicated by soil mottling.
B. 
A rock with open joints, fracture or solution channels, or masses of loose rock fragments, including gravel, with insufficient fine soil to fill the voids between the fragments.
C. 
A rock formation, other stratum or soil condition that is so slowly permeable that it effectively limits downward passage of effluent.
LOT
A designated parcel, tract or area of land established by a plat or otherwise as permitted by law and to be used, developed or built upon as a unit.
LOW IMPACT DEVELOPMENT (LID) PRACTICES
Practices that will minimize proposed conditions runoff rates and volumes, which will minimize needs for artificial conveyance and storage facilities.
MAIN STEM (MAIN CHANNEL)
Any stream segment or other runoff conveyance used as a reach in the Neshaminy and Little Neshaminy Creeks hydrologic model.
MANAGER
The Manager of Middletown Township, Bucks County, Pennsylvania, or other person so designated by the Board of Supervisors.
MANNING EQUATION (MANNING FORMULA)
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.
MAXIMUM EXPECTED DISCHARGE
The maximum expected quantity of water arriving at a particular location.
NATURAL HYDROLOGIC REGIME
See "hydrologic regime."
NATURAL RECHARGE AREA
Undisturbed surface area or depression where stormwater collects, and a portion of which infiltrates and replenishes the groundwater.
NONPOINT SOURCE POLLUTION
Pollution that enters a water body from diffuse origins in the watershed and does not result from discernible, confined or discrete conveyances.
NONSTORMWATER DISCHARGES
Water flowing in stormwater collection facilities, such as pipes or swales, which is not the result of a rainfall event or snowmelt.
NONSTRUCTURAL BEST MANAGEMENT PRACTICE (BMP)
Methods of controlling stormwater runoff quantity and quality, such as innovative site planning, impervious area and grading reduction, protection of natural depression areas, temporary ponding on site and other techniques.
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.
NRCS
Natural Resource Conservation Service (previously Soil Conservation Service).
OPEN CHANNEL
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 and canals.
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.
OUTLET
Points of water disposal to a stream, river, lake, tidewater or artificial drain.
PA DEP
The Pennsylvania Department of Environmental Protection.
PARENT TRACT
The parcel of land from which a land development or subdivision originates, determined from the date of Township adoption of this chapter.
PARKING LOT STORAGE
Involves the use of parking areas as temporary impoundments with controlled release rates during rainstorms.
PEAK DISCHARGE
The maximum rate of stormwater runoff from a specific storm event.
PENN STATE RUNOFF MODEL
The computer-based hydrologic model developed at the Pennsylvania State University.
PENN STATE RUNOFF MODEL (CALIBRATED)
The computer-based hydrologic modeling technique adapted to the Delaware River South watershed for the Act 167 plan. The model has been calibrated to reflect actual recorded flow values by adjoining key model input parameters.
PERSON
An individual, partnership, public or private association, corporation, partnership, limited liability company or a governmental unit, public utility or any other legal entity whatsoever which is recognized by law as the subject of rights and duties.
PERVIOUS SURFACE
A surface that allows the infiltration of water into the ground.
PIPE
A culvert, closed conduit or similar structure (including appurtenances) that conveys stormwater.
PLANNING COMMISSION
The Planning Commission of Middletown Township.
PMF (PROBABLE MAXIMUM FLOOD)
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 based on data obtained from the National Oceanographic and Atmospheric Administration (NOAA).
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 § 92.1.[5]
POST CONSTRUCTION
Period after construction during which disturbed areas are stabilized, stormwater controls are in place and functioning and all proposed improvements in the approved land development plan are completed.
POST-CONSTRUCTION STORMWATER MANAGEMENT PLAN (PCSWM)
A copy of an approved BMP operations and maintenance plan, which contains the original required endorsements of the Township and which is intended to be recorded with the Bucks County Recorder of Deeds.
PREDEVELOPMENT
Undeveloped/natural condition. (When applying recharge and stormwater requirements meeting definition of "regulated activity," existing impervious coverage shall be considered as meadow conditions.)
PRETREATMENT
Techniques employed in stormwater BMPs to provide storage or filtering to trap coarse materials and other pollutants before they enter the system, but not necessarily designed to meet the water quality volume requirements of § 430-404.
PROJECT SITE
The specific area of land where any regulated activities in the Township are planned, conducted or maintained.
RATIONAL FORMULA
A rainfall-runoff relation used to estimate peak flow.
RECHARGE
The replenishment of groundwater through the infiltration of rainfall, other surface waters, or land application of water or treated wastewater.
RECONSTRUCTION
The process by which existing developed area is adaptively reused, rehabilitated, restored, renovated and/or expanded. The development relies on existing infrastructure and does not require an extension of water, sewer or other public utilities.
RECORD O&M PLAN
A copy of an approved BMP operations and maintenance plan which contains the original required endorsements of the Township and which is intended to be recorded with the Bucks County Recorder of Deeds.
REDEVELOPMENT
Any development that requires demolition or removal of existing structures or impervious surfaces at a site and/or the replacement with new impervious surfaces. Maintenance activities such as top-layer grinding and repaving are not considered to be redevelopment. Interior remodeling projects and tenant improvements are also not considered to be redevelopment. Utility trenches in streets are not considered redevelopment unless more than 50% of the street width including shoulders is removed and repaved.
REGULATED ACTIVITIES
Actions or proposed actions that have an impact on stormwater runoff quality or quantity and that are specified in § 430-105 of this chapter.
RELEASE RATE
The percentage of existing conditions peak rate of runoff from a site or subarea to which the proposed conditions peak rate of runoff must be reduced to protect downstream areas.
REPAVING
Replacement of the impervious surface that does not involve reconstruction of an existing paved (impervious) surface.
REPLACEMENT PAVING
Reconstruction of and full replacement of an existing paved (impervious) surface.
RETENTION BASIN
A structure in which stormwater is stored and not released during the storm event. Retention basins are designed for infiltration purposes and do not have an outlet. The retention basin must infiltrate stored water in four days or less.
RETURN PERIOD
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 of once every 25 years.
RISER
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.
ROAD MAINTENANCE
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.
ROOF DRAINS
A drainage conduit or pipe that collects water runoff from a roof and leads it away from the structure.
ROOFTOP DETENTION
The temporary ponding and gradual release of stormwater falling directly onto flat roof surfaces using controlled-flow roof drains into building designs.
RUNOFF
Any part of precipitation that flows over the land surface.
RUNOFF COEFFICIENT
That portion of a total volume of water which can be expected to flow off a particular surface.
SALDO
Subdivision and Land Development Ordinance; Chapter 440 of this Code.
SEDIMENT BASIN
A barrier, dam, retention or detention basin located and designed in such a way as to retain rock, sand, gravel, silt or other material transported by water during construction.
SEDIMENT POLLUTION
The placement, discharge or any other introduction of sediment into the waters of the commonwealth.
SEDIMENTATION
The process by which mineral or organic matter is accumulated or deposited by the movement of water or air.
SEEPAGE PIT/SEEPAGE TRENCH
An area of excavated earth filled with loose stone or similar coarse material, into which surface water is directed for infiltration into the underground water.
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.
SHALLOW CONCENTRATED FLOW
Stormwater runoff flowing in shallow, defined ruts prior to entering a defined channel or waterway.
SHEET FLOW
A flow process associated with broad, shallow water movement on sloping ground surfaces that is not channelized or concentrated.
SOIL-COVER-COMPLEX METHOD
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).
SOLICITOR
The Solicitor of Middletown Township, Bucks County, Pennsylvania.
SOURCE WATER PROTECTION AREAS (SWPA)
The zone through which contaminants, if present, are likely to migrate and reach a drinking water well or surface water intake.
SPECIAL PROTECTION SUBWATERSHEDS
Watersheds that have been designated in Pennsylvania Code, Title 25, Environmental Protection, Chapter 93, Water Quality Standards, as exceptional value (EV) or high quality (HQ) waters.
SPILLWAY
A conveyance that is used to pass the peak discharge of the maximum design storm that is controlled by the stormwater facility.
STATE WATER QUALITY REQUIREMENTS
As defined under state regulations, protection of designated and existing uses (see 25 Pa. Code, Chapters 93 and 96), including:
A. 
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.
B. 
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.
C. 
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.
STORAGE-INDICATION METHOD
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.
STORM FREQUENCY
The number of times that a given storm "event" occurs or is exceeded on the average in a stated period of years. See "return period."
STORM SEWER
A system of pipes and/or open channels that conveys intercepted runoff and stormwater from other sources, but excludes domestic sewage and industrial wastes.
STORMWATER
The surface runoff generated by precipitation reaching the ground surface.
STORMWATER MANAGEMENT FACILITY
Any structure, natural or man-made, that, due to its condition, design or construction, conveys, stores or otherwise affects stormwater runoff quality, rate or quantity. Typical stormwater management facilities include, but are not limited to, detention and retention basins, open channels, storm sewers, pipes and infiltration structures.
STORMWATER MANAGEMENT PLAN
The watershed plan known as the "Neshaminy and Little Neshaminy Creeks or the Delaware River South Watershed Act 167 Stormwater Management Plan" for managing those land use activities that will influence stormwater runoff quality and quantity and that would impact the Neshaminy and Little Neshaminy Creeks or the Delaware River South Watersheds, adopted by Bucks County as required by the Act of October 4, 1978, P.L. 864 (Act 167).
STORMWATER MANAGEMENT SITE PLAN
The plan prepared by the applicant or his representative indicating how stormwater runoff will be managed at the particular site of interest according to this chapter.
STREAM
A natural watercourse.
STREAM BUFFER
The land area adjacent to each side of a natural stream, essential to maintaining water quality. (See "buffer.") (Not man-made.)
STREAM ENCLOSURE
A bridge, culvert or other structure in excess of 100 feet in length, upstream to downstream, which encloses a regulated water of the commonwealth.
STRIPPING
The removal of vegetation, including trees and topsoil. The normal process of gardening or property maintenance shall be excluded from this definition.
SUBAREA (SUBWATERSHED)
The smallest drainage unit of a watershed for which stormwater management criteria has been established in the stormwater management plan.
SUBDIVISION
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.
SURFACE WATERS OF THE COMMONWEALTH
Any and all rivers, streams, creeks, rivulets, ditches, watercourses, storm sewers, lakes, dammed water, wetlands, ponds, springs and all other bodies or channels of conveyance of surface waters, or parts thereof, whether natural or artificial, within or on the boundaries of the commonwealth.
SWALE
A low-lying stretch of land that gathers or carries surface water runoff.
TIMBER OPERATIONS
See "forest management."
TIME TO PEAK (Tp)
A factor used in conjunction with the application of the Rational Method, which specifies a lag factor between the time of concentration (Tc) and the peak runoff for a given watershed. For purposes of this chapter, Tp shall equal 3 for the standard Rational Method, 5 for the Modified Rational Method and 7 for the DeKalb Rational Method.
TIME-OF-CONCENTRATION (Tc)
The time required 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.
TOP-OF-BANK
Highest point of elevation in a stream channel cross section at which a rising water level just begins to flow out of the channel and over the floodplain.
TOWNSHIP
Middletown Township, Bucks County, Pennsylvania.
TOWNSHIP ENGINEER
A. 
A professional engineer licensed as such in the Commonwealth of Pennsylvania, duly appointed as the engineer for a township, planning agency or joint planning commission.
B. 
A professional engineer licensed as such in the Commonwealth of Pennsylvania, duly appointed as the Engineer for the Township by the Board of Supervisors to perform the duties of Engineer as herein specified.
VERNAL POND
Seasonal depressional wetlands that are covered by shallow water for variable periods from winter to spring but may be completely dry for most of the summer and fall.
WATERCOURSE
A channel or conveyance of surface water having a defined bed and banks, whether natural or artificial, with perennial or intermittent flow.
WATERS OF THE COMMONWEALTH
Any and all rivers, streams, creeks, rivulets, 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 the commonwealth.
WATERSHED
Region or area drained by a river, watercourse or other body of water; whether natural or artificial.
WELLHEAD
A. 
A structure built over a well;
B. 
The source of water for a well.
WELLHEAD PROTECTION AREA
The surface and subsurface area surrounding a water supply well, well field, or spring supplying a public water system, through which contaminants are reasonably likely to move toward and reach the water source.
WET BASIN
Pond for urban runoff management that is designed to detain urban runoff and always contains water.
WETLAND
Those 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. Wetlands generally include swamps, marshes, bogs, fens and similar areas.
ZONING OFFICER
The Zoning Officer of Middletown Township, Bucks County, Pennsylvania, so appointed by the Board of Supervisors.
[1]
Editor's Note: Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. I).
[2]
Editor's Note: See 32 P.S. § 680.1 et seq.
[3]
Editor's Note: Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. I).
[4]
Editor's Note: See 53 P.S. § 10503(1.1).
[5]
Editor's Note: Chapter 92 of the Pa. Code was reserved 10-8-2010. Defined terms can now be found at 25 Pa. Code § 92a.2.