[Ord. 266, 7/11/2005, Art. II]
1. 
For the purposes of this Chapter 25B, 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, or any other similar entity.
D. 
The words "shall" and "must" refer to items which are mandatory; the words "may" and "should" refer to items which are permissive.
E. 
The words "used or occupied" include the words "intended, designed, maintained, or arranged to be used, occupied, or maintained."
(TO) GRADE
To finish the surface of a roadbed, top of embankment, or bottom of excavation.
ACCELERATED EROSION
The removal of the surface of the land through the combined action of man's activity and the natural processes at 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 landowner or applicant who has filed an application for approval to engage in any regulated activities as defined in § 25B-104 of this Chapter 25B.
AS-BUILT DRAWINGS
Those 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, or a copy of the same, are turned over the Engineer at the completion of the project.
BANKFULL
The channel at the top of bank or point where water begins to overflow onto a floodplain.
BASE FLOW
The portion of stream flow that is sustained by groundwater discharge.
BIORETENTION
A stormwater retention area which utilizes woody and herbaceous plants and soils to remove pollutants before infiltration occurs.
BMP (BEST MANAGEMENT PRACTICE)
Stormwater structures, facilities and techniques to control, maintain or improve the quantity and quality of surface runoff. The PA Handbook of BMPs for Developing Areas and the Maryland Stormwater Design Manual may be referenced for specific BMP practices.
CHANNEL EROSION
The widening, deepening, and headward cutting of small channels and waterways, due to erosion caused by moderate to large floods.
CISTERN
An underground reservoir or tank for storing rainwater.
CONSERVATION DISTRICT
The Bucks County Conservation District.
CULVERT
A structure with appurtenant works which carries a stream under or through an embankment or fill.
DAM
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.
DEP
The Pennsylvania Department of Environmental Protection.
DEPARTMENT
The Pennsylvania Department of Environmental Protection.
DESIGN PROFESSIONAL (QUALIFIED)
A Pennsylvania registered professional engineer, registered landscape architect, or a 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 of the Borough Planning Commission and/or agent of the governing body involved with the administration, review or enforcement of any provisions of this Chapter 25B by contract or memorandum of understanding.
DETENTION BASIN
An impoundment structure designed to manage stormwater runoff by temporarily storing the runoff and releasing it at a predetermined rate.
DETENTION DISTRICT
Those subareas in which some type of detention is required to meet the plan requirements and the goals of Act 167.
DEVELOPMENT SITE
The specific tract of land for which a regulated activity is proposed.
DIFFUSED DRAINAGE DISCHARGE
Drainage discharge not confined to a single point location or channel, such as sheet flow or shallow concentrated flow.
DISTURBED AREAS
Unstabilized land area where an earth disturbance activity is occurring or has occurred.
DOWNSLOPE PROPERTY LINE
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 towards it.
DRAINAGE CONVEYANCE FACILITY
A stormwater management facility designed to transmit stormwater runoff and shall include streams, channels, swales, pipes, conduits, culverts, storm sewers, etc.
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 municipal governing body after the drainage plan has been approved. Said permit is issued prior to or with the final municipal approval.
DRAINAGE PLAN
The documentation of the stormwater management system, to be used for a given development site, the contents of which are established in § 25B-403.
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.
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 movement of soil particles by the action of water, wind, ice, or other natural forces.
EROSION AND SEDIMENT POLLUTION CONTROL PLAN
A plan that is designed to minimize accelerated erosion and sedimentation.
ERSAM
Existing resource and site analysis map.
EXCEPTIONAL VALUE WATERS
Surface waters of high quality which satisfy 25 Pa. Code, Environmental Protection, Chapter 93, Water Quality Standards, § 93.4b(b) (relating to antidegradation).
EXISTING CONDITIONS
The initial condition of a project site prior to the proposed construction. 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" values.
FLOOD
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 this commonwealth.
FLOODPLAIN
Any land area susceptible to inundation by water from any natural source or delineated as a special flood hazard area on the applicable National Flood Insurance Program Flood Insurance Rate Map (FIRM) prepared by the Federal Emergency Management Agency (FEMA). Also included are areas that comprise Group 13 Soils, as listed in Appendix A of the Pennsylvania DEP of Environmental Protection (DEP) Technical Manual for Sewage Enforcement Officers (as amended or replaced from time to time by DEP).
FLOODWAY
The channel of the watercourse and those portions of the adjoining floodplains that are reasonably required to carry and discharge the one-hundred-year frequency flood, unless otherwise specified, the boundary of the floodway is as indicated on maps and flood insurance studies provided by FEMA. In an area where no FEMA maps or studies have defined the boundary of the one-hundred-year frequency way, it is assumed absent evidence to the contrary that the floodway extends the stream to 50 feet from the top of the bank of the stream.
FOREST MANAGEMENT/TIMBER OPERATIONS
Planning and activities necessary for the management of forest land. 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.
FREEBOARD
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.
GRADE
A slope, usually of a road, channel, or natural ground specified in percent and shown on plans as specified herein.
GRASSED WATERWAY
A natural or constructed waterway, usually broad and shallow, covered with erosion-resistant grasses, used to conduct surface water.
GROUNDWATER RECHARGE
Replenishment of existing natural underground water supplies.
HEC-HMS
The U.S. Army Corps of Engineers, Hydrologic Engineering Center (HEC) - Hydrologic Modeling System (HMS) adapted to the East Branch Perkiomen Creek watershed.
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 25 Pa. Code, Environmental Protection, Chapter 93, Water Quality Standards, § 93.4b(a).
HYDROLOGIC REGIME (NATURAL)
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 percolation of water into the ground such as building rooftops, pavement, sidewalks, driveways and compacted earth or turf.
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 very close proximity to urban areas. The development relies on existing infrastructure and does not require an extension of water, sewer, or other public utilities.
INFILTRATION
The passing of stormwater through the soil from the surface.
INFILTRATION STRUCTURES
A structure designed to direct runoff into the ground (e.g., french drains, seepage pits, seepage trench).
INLET
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.
LAND DEVELOPMENT
(1) 
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 residential or nonresidential buildings, whether initially or cumulatively, or a single nonresidential building on a lot or lots regardless of the number of occupants or tenure; or
(b) 
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.
(2) 
A subdivision of land.
(3) 
Development in accordance with § 503(1.1) of the Pennsylvania Municipalities Planning Code Act of 1968 (Act 247), 53 P.S. § 10503(1.1).
LAND EARTH DISTURBANCE
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.
LIMITING ZONE
A soil horizon or condition in the soil profile or underlying strata which includes one of the following:
(1) 
A seasonal high water table, whether perched or regional, determined by direct observation of the water table or indicated by soil mottling.
(2) 
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.
(3) 
A rock formation, other stratum or soil condition which is so slowly permeable that it effectively limits downward passage of effluent.
MAIN STEM (MAIN CHANNEL)
Any stream segment or other runoff conveyance facility used as a reach in the East Branch Perkiomen Creek hydrologic model.
MANNING EQUATION IN (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.
MUNICIPALITY
Borough of Dublin, Bucks County, Pennsylvania.
NATURAL HYDROLOGIC REGIME
See "hydrologic regime."
NONPOINT SOURCE POLLUTION
Pollution that enters a body of water from diffuse origins in the watershed and does not result from confined or discrete conveyances.
NRCS
Natural Resources Conservation Service (previously SCS).
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, canals, and pipes flowing partly full.
OUTFALL
Point where water flows from a conduit, stream, or drain.
OUTLET
Points of water disposal from a stream, river, lake, tidewater or artificial drain.
PARENT TRACT
The parcel of land from which a land development or subdivision originates as of the date of the original East Branch Perkiomen Creek stormwater ordinance adoption.
PARKING LOT STORAGE
Involves the use of impervious 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 (CALIBRATED)
The computer based hydrologic modeling technique adapted to the East Branch Perkiomen Creek watershed for the Act 167 plan. The model has been "calibrated" to reflect actual recorded flow values by adjoining key model input parameters.
PIPE
A culvert, closed conduit, or similar structure (including appurtenances) that conveys stormwater.
PLANNING COMMISSION
The Planning Commission of Dublin Borough.
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).
PREDEVELOPMENT
Undeveloped/natural condition.
PRETREATMENT
Techniques employed in stormwater BMPs to provide storage or filtering to help trap coarse materials and other pollutants before they enter the system.
RATIONAL FORMULA OR RATIONAL METHOD
A rainfall-runoff relation used to estimate peak flow.
RECHARGE AREA
Undisturbed surface area or depression where stormwater collects, and a portion of which infiltrates and replenishes the underground and groundwater.
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 DRAWINGS
Original documents revised to suit the as-built conditional and subsequently provided by the Engineer to the client. The Engineer takes the contractor's as-builts, reviews them in detail with his/her own records for completeness, then either turns these over to the client or transfers the information to a set or reproducibles, in both cases for the client's permanent records.
REDEVELOPMENT
The construction, alteration, or improvement exceeding 5,000 square feet of land disturbance performed on sites where existing land use is commercial, industrial, institutional, or multifamily residential.
REGULATED ACTIVITIES
Actions or proposed actions that have an impact on stormwater runoff and that are specified in § 25B-104 of this Chapter 25B.
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.
RETENTION BASIN
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.
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.
ROOFTOP DETENTION
Temporary ponding and gradual release of stormwater falling directly onto flat roof surfaces by incorporating controlled-flow roof drains into building designs.
RUNOFF
Any part of precipitation that flows over the land surface.
SALDO
Subdivision and Land Development Ordinance [Chapter 22].
SEDIMENT BASIN
A barrier, dam, or retention or detention basin located and designed to retain rock, sand, gravel, silt, or other material transported by water.
SEDIMENT POLLUTION
The placement, discharge, or any other introduction of sediment into the waters of the commonwealth occurring from the failure to design, construct, implement or maintain control measures and control facilities in accordance with the requirements of the DEP erosion and sediment pollution control program manual.
SEDIMENTATION
The process by which mineral or organic matter is accumulated or deposited by the movement of water.
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 ground.
SHEET FLOW
Runoff that flows over the ground surface as a thin, even layer, not concentrated in a channel.
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).
SOURCE WATER PROTECTION AREA (SWPA)
The zone through which contaminants are likely to migrate and reach a drinking water well or surface water intake.
SPECIAL PROTECTION SUBWATERSHEDS
Watersheds for which the receiving waters are exceptional value (EV) or high quality (HQ) waters.
SPILLWAY
A conveyance that is used to pass the peak discharge of the maximum design storm controlled by the stormwater facility.
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 convey intercepted runoff and stormwater from other sources, but excludes domestic sewage and industrial wastes.
STORMWATER
The total amount of 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. 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 plan for managing stormwater runoff in the East Branch Perkiomen Creek watershed adopted by Bucks County as required by the Act of October 4, 1978, P.L. 864 (Act 167), 32 P.S. § 680.1 et seq., and known as the "East Branch Perkiomen Creek Watershed Act 167 Stormwater Management Plan."
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 25B.
STREAM
A natural watercourse.
STREAM BUFFER
The land area adjacent to each side of a stream, essential to maintaining water quality measured 150 feet from the lop of the bank.
STREAM ENCLOSURE
A bridge, culvert or other structure in excess of 100 feet in length upstream to downstream which encloses a regulated water of this commonwealth.
SUBAREA
The smallest drainage unit of a watershed for which stormwater management criteria have 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 of 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 proposes into parcels of more than 10 acres, not involving any new street or easement of access or any residential dwelling, shall be exempted.
SWALE
A low lying stretch of land which gathers or carries surface water runoff.
TIMBER OPERATIONS
See "forest management."
TIME-OF-CONCENTRATION (Tc)
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.
WATERCOURSE
A river, brook, creek, or a channel or ditch for water, whether natural or man-made 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 of Pennsylvania.
WELLHEAD
The point at which a groundwater well bore hole meets the surface of the ground.
WELLHEAD PROTECTION AREA
The surface and subsurface area surrounding a water supply well, well field, spring, or infiltration gallery supplying a public water system, through which contaminants are reasonably likely to move towards and reach the water source.
WETLAND
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, ferns, and similar areas.