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 those of feminine gender and vice versa.
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" 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 or occupied."
F. 
The time within which any act required by this chapter is to be performed shall be computed by excluding the first day and including the last day. However, if the last day is a Saturday or Sunday or a holiday declared by the United States Congress or the Pennsylvania General Assembly, it shall also be excluded. The word "day" shall mean a calendar day, unless otherwise indicated.
G. 
Any words not defined in this chapter or in Section 107 of the MPC shall be construed as defined in standard dictionary usage.
H. 
References to officially adopted regulations, standards, or publications of the DEP or other governmental agencies shall include the regulation, publication, or standard in effect on the date when an SWM site plan is first filed. It is the intent of the Borough Council in enacting this chapter to incorporate such changes to statutes, regulations, and publications to the extent authorized by 1 Pa. C.S.A. § 1937.
Specific terms or words used herein, unless otherwise expressly stated, shall have the following meanings:
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 processes alone.
ACCESS EASEMENT
A right granted by a landowner to a grantee, allowing entry for the purpose of inspecting, maintaining and repairing SWM facilities.
ACT 167 PLAN
A plan prepared under the authority of Pennsylvania's Storm Water Management Act of October 4, 1978, P.L. 864, No. 167, as amended 32 P.S. § 680.1 et seq., and as may be amended in the future.
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 areas 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; the changing of surface conditions by causing the surface to be more or less impervious; any land disturbance.
ANIMAL HEAVY-USE AREAS
A barnyard, feedlot, loading area, exercise lot, or other similar area on an agricultural operation where, due to the concentration of animals, it is not possible to establish and maintain vegetative cover of a density capable of minimizing accelerated erosion and sedimentation by usual planting methods. The term does not include entrances, pathways and walkways between areas where animals are housed or kept in concentration.
APPLICANT
A landowner or developer who has filed an application for approval to engage in any regulated activities as defined in § 187-5 of this chapter.
BMP MANUAL
The Pennsylvania Storm Water Best Management Practices Manual, as published by the Department of Environmental Protection (PADEP), December 2006, or most-recent version thereof.
BMPs (BEST MANAGEMENT PRACTICES)
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 stormwater runoff generation resulting from an alteration of the land surface or 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 wet 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.
BUILDING
Any enclosed or open structure, other than a boundary wall or fence, occupying more than four square feet of area and/or having a roof supported by columns, piers, or walls.
BOROUGH
The Borough of Manheim, Lancaster County, Pennsylvania.
BOROUGH COUNCIL
The Manheim Borough Council.
CARBONATE GEOLOGY
Limestone or dolomite bedrock. Carbonate geology is often associated with karst topography.
CHAPTER 102
Chapter 102 of the regulations of PADEP, 25 Pa. Code § 102.1 et seq. (Erosion and Sediment Control).
CHAPTER 105
Chapter 105 of the regulations of PADEP, 25 Pa. Code § 105.1 et seq. (Dam Safety and Waterway Management).
CHAPTER 106
Chapter 106 of the regulations of PADEP, 25 Pa. Code § 106.1 et seq. (Floodplain Management).
CISTERN
A reservoir or tank for storing rainwater.
CONSERVATION DISTRICT
The Lancaster County Conservation District or any agency successor thereto.
CONSERVATION PLAN
A plan written by a National Resources Conservation Service (or any agency successor thereto) certified planner that identifies conservation practices and includes site-specific BMPs for agricultural plowing or tilling activities and animal heavy-use areas.
CONVEYANCE
The ability of a pipe, culvert, swale or similar facility to carry the peak flow from the design storm.
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. The dam falls under the requirements of Chapter 105, Dam Safety and Waterway Management, if any of the following is true:
A. 
The contributory drainage area exceeds 100 acres.
B. 
The greatest depth of water measured by upstream toe of the dam at maximum storage elevation exceeds 15 feet.
C. 
The impounding capacity at maximum storage elevation exceeds 50 acre-feet.
DEP also PA DEP or PADEP
The Pennsylvania Department of Environmental Protection or any agency successor to the Pennsylvania Department of Environmental Protection.
DESIGNEE
The agent of the Manheim Borough Council involved with the administration, review, or enforcement of any provisions of this chapter.
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.
DETENTION BASIN
An impoundment structure designed to manage stormwater runoff by temporarily storing the runoff and releasing it at a predetermined rate.
DETENTION VOLUME
The volume of runoff that is captured and released into the waters of this commonwealth at a controlled rate.
DEVELOPER
A person, partnership, association, corporation, or other entity, or any responsible person therein or agent thereof, that undertakes any regulated activity of this chapter.
DEVELOPMENT SITE
The specific area of land for which a regulated activity is proposed, planned, conducted, or maintained.
DISAPPEARING STREAM
A stream in an area underlain by limestone or dolomite which flows underground for a portion of its length.
DISCONNECTED IMPERVIOUS AREA (DIA)
An impervious or impermeable surface that is disconnected from any stormwater drainage or conveyance system and is redirected or directed to a pervious area, which allows for infiltration, filtration, and increased time of concentration.
DISTURBED AREA
A land area where an earth disturbance activity is occurring or has occurred.
DRAINAGE EASEMENT
A right granted by a landowner to a grantee, allowing the use of private land for stormwater management, drainage, or conveyance purposes.
E&S
Erosion and sediment.
EARTH DISTURBANCE ACTIVITY
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; operation of animal heavy-use areas; timber harvesting activities; road maintenance activities; oil and gas activities; well drilling; mineral extraction; building construction; and the moving, depositing, stockpiling, or storing of soil, rock, or earth materials.
ENVIRONMENTALLY SENSITIVE AREA
Slopes greater than 15% shallow bedrock (located within six feet of ground surface), wetlands, natural heritage areas and other areas designated as conservation or preservation areas in Greenscapes, the Green Infrastructure Element of the County Comprehensive Plan, where encroachment by land development or land disturbance results in degradation of the natural resource.
EPHEMERAL STREAM
A transient stream, one that flows for a relatively short time.
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 which is designed to minimize accelerated erosion and sedimentation.
EXISTING CONDITIONS
The initial condition of a project site prior to the proposed regulated activity. If the initial condition of the site is not forested or undeveloped land, the land use shall be considered as "meadow" unless the natural land cover is documented to generate lower curve numbers or Rational "C" coefficients, such as forested lands.
FACILITY DEPTH
For above-ground detention/retention/BMP facilities, the facility depth is defined to be the depth between the bottom invert of the lowest orifice and the invert of the spillway. If there is no spillway, the top of the berm shall be used. For basins with no orifices or outlet structure, the bottom elevation of the basin shall be used.
FEMA
The Federal Emergency Management Agency or any agency successor thereto.
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.
FLOOD FRINGE
That portion of the floodplain outside of the floodway.
FLOODPLAIN
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 Maps as being a special flood hazard area; also, the area of inundation which functions as a storage or holding area for floodwater to a width required to contain a base flood of which there is a one-percent chance of occurring in any given year. The floodplain contains both the floodway and the flood fringe.
FLOOD PLAIN MANAGEMENT ACT
Act of October 4, 1978, P.L. 851, No. 166, as amended 32 P.S. § 679.101 et seq., and as may be amended in the future.
FLOODWAY
The channel of the 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 the bank of the stream.
FOREST MANAGEMENT/TIMBER OPERATIONS
Planning and activities necessary for the management of forest land. These include timber inventory; 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 one-hundred-year design elevation of the water surface at the emergency spillway, in a condition that assumes the primary outlet(s) are blocked, and the top of a dam, levee, tank, basin, berm, or diversion ridge.
FREQUENCY
The probability or chance that a given storm event/flood will be equaled or exceeded in a given year.
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 from cropland.
GREEN INFRASTRUCTURE
Systems and practices that use or mimic natural processes to infiltrate, evapotranspire, or reuse stormwater on the site where it is generated.
[Added 9-13-2022 by Ord. No. 676]
GROUNDWATER RECHARGE
Replenishment of existing natural underground water supplies.
HYDROLOGIC SOIL GROUP (HSG)
The classification of soils according to their runoff-producing characteristics by NRCS. Soils are classified into four HSGs (A, B, C, and D) according to their minimum infiltration rate, which is obtained for bare soil after prolonged wetting. The NRCS defines the four groups and provides a list of most of the soils in the United States and their group classification. The soils in the area of the development site may be identified from a soil survey report that can be obtained from local NRCS offices or Conservation District offices. Soils become less pervious as the HSG varies from A to D.
IMPERVIOUS SURFACE
A surface that prevents the infiltration of water into the ground. Impervious surfaces (or areas) shall include, but are not limited to, roofs, additional indoor living spaces, patios, garages, storage sheds and similar structures, and any new streets and sidewalks. Any surface area proposed to initially be gravel or crushed stone shall be assumed to be impervious, unless designed and maintained as an infiltration BMP. Decks, parking areas, and driveway areas are not counted as impervious areas if they do not prevent infiltration.
IMPOUNDMENT
A retention or detention basin designed to retain stormwater runoff and release it at a controlled rate.
INFILTRATION STRUCTURES
A structure designed to direct runoff into the ground (e.g. French drains, seepage pits, infiltration trenches, rain gardens, etc.).
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.
KARST
A type of topography or landscape characterized by features including, but not limited to, surface depressions, sinkholes, rock pinnacles/uneven bedrock surface, underground drainage, and caves. Karst is formed on carbonate rocks, such as limestone or dolomite.
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.[1]
LAND 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 condition of the land; the erection of a dwelling or other structure; or the modification, removal, filling, or alteration of an existing stormwater management facility or drainage easement. Land disturbance activities shall be classified as follows:
A. 
Major land disturbance activity:
(1) 
Any use requiring the submission of a subdivision or land development plan, as herein defined;
(2) 
Any land disturbance not defined as a minor land disturbance activity or deemed to qualify as a minor land disturbance activity by the Borough;
(3) 
Any use involving the diversion or piping of any natural or man-made watercourse or existing drainage pattern;
(4) 
Any use involving the installation of ground cover, grading, filing, excavation, or disturbance of woodland in excess of one acre, except for the use of land for agricultural plowing and tilling and the science of forestry when operated in accordance with approved conservation and erosion control practices.
B. 
Minor land disturbance activity:
(1) 
The use of land on an existing lot of record, including subdivided lots or land developments approved under a major land disturbance activity, provided that:
(a) 
The use is not within a floodplain area;
(b) 
No diversion or piping of any natural or man-made watercourse or existing drainage pattern is involved;
(c) 
The use creates impervious areas of more than 1,000 square feet and less than 5,000 square feet and/or involves the removal of ground cover, grading, filling, or excavation of an area less than 5,000 square feet, either of which shall be measured on a cumulative basis from July 29, 2014;
[Amended 9-13-2022 by Ord. No. 676]
(d) 
The use does not require the submission of a subdivision or land development plan, as herein defined.
(2) 
Any use of the land which, in the opinion of the Borough, represents minimal ground disturbance or impact to the environment.
LANDOWNER
The legal or beneficial owner or owners of land, including the holder of an option or contract to purchase (whether or not such option or contract is subject to any condition), a lessee if he is authorized under the lease to exercise the rights of the landowner, or other person having a proprietary interest in land.
LIMITING ZONE
A rock formation, other stratum, or soil condition which is so slowly permeable that it effectively limits downward passage of effluent. Seasonal high-water tables, whether perched or regional, also constitute a limiting zone.
LINEAMENT
A fracture on the order of tens of kilometers long, usually extending to the basement below sedimentary rock.
LOW-IMPACT DEVELOPMENT (LID)
Site design approaches and small-scale stormwater management practices that promote the use of natural systems for infiltration, evapotranspiration, and reuse of rainwater. LID can be applied to new development, urban retrofits, and revitalization projects. LID utilizes design techniques that infiltrate, filter, evaporate, and store runoff close to its source. Rather than rely on costly large-scale conveyance and treatment systems, LID addresses stormwater through a variety of small, cost-effective landscape features located on-site.
[Added 9-13-2022 by Ord. No. 676]
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 EXTENT PRACTICABLE (MEP)
Applies when the applicant demonstrates to the Borough's satisfaction that the performance standard is not achievable. The applicant shall take into account the best available technology, cost effectiveness, geographic features, and other competing interests, such as protection of human safety and welfare, protection of endangered and threatened resources, and preservation of historic properties, in making the assertion that the performance standard cannot be met and that a different means of control is appropriate.
MUNICIPALITIES PLANNING CODE (MPC)
The Pennsylvania Municipalities Planning Code, Act of July 1, 1967, P.L. 805, No. 247, as reenacted and amended, 53 P.S. § 10101 et seq., and as may be amended in the future.
MUNICIPAL SEPARATE STORM SEWER
A conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains), which is all of the following:
A. 
Owned or operated by a state, city, town, borough, county, district, association or other public body (created under state law) having jurisdiction over disposal of sewage, industrial wastes, stormwater or other wastes;
B. 
Designed or used for collecting or conveying stormwater;
C. 
Not a combined sewer; and
D. 
Not part of a publicly owned treatment works, as defined at 40 CFR 122.2.
MUNICIPAL SEPARATE STORM SEWER SYSTEM (MS4)
All separate storm sewers that are defined as "large" or "medium" or "small" municipal separate storm sewer systems pursuant to 40 CFR 122.26(b)(18), or designated as regulated under 40 CFR 122.26(a)(1)(v).
NATIONAL POLLUTION DISCHARGE ELIMINATION SYSTEM (NPDES)
The federal government's system for issuance of permits under the Clean Water Act, which is delegated to the PADEP in Pennsylvania.
NATURAL DRAINAGEWAY
An existing channel for water runoff that was formed by natural forces.
NATURAL GROUND COVER
Ground cover which mimics the infiltration characteristics of the predominant hydrologic soil group found at the site.
NATURAL RESOURCES CONSERVATION SERVICE (NRCS)
Previously the Soil Conservation Service (SCS), or any agency successor to the NRCS.
NOAA ATLAS 14
The Precipitation-Frequency Atlas of the United States, Atlas 14, Volume 2, United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service, Hydrometeorological Design Studies Center, Silver Spring, Maryland (2004). NOAA's Atlas 14, United States can be accessed at Internet address: http://hdsc.nws.noaa.gov/hdsc/pfds/ (as may be revised from time to time).
[Amended 9-13-2022 by Ord. No. 676]
OPEN CHANNEL
A stormwater management 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
A. 
A point where water flows from a conduit, stream, or drain;
B. 
"Point source," as described in 40 CFR 122.2, at the point where the municipal separate storm sewer system discharges to surface waters of this commonwealth.
OUTLET
Points of water disposal from a stream, river, lake, tidewater or artificial drain.
PARENT TRACT
All contiguous land held in single and separate ownership, regardless of whether: such land is divided into one or more lots, parcels, purparts, or tracts; such land was acquired by the landowner at different times or by different deeds, devise, partition, or otherwise; or such land is bisected by public or private streets or rights-of-way, which was held by the landowner or his predecessor in title on the effective date of this chapter. "Single and separate ownership" is the ownership of property by any person, partnership, or corporation, in which ownership is separate and distinct from that of any adjoining property.
PEAK DISCHARGE
The maximum rate of stormwater runoff from a specific storm event.
PennDOT
The Pennsylvania Department of Transportation, or any agency successor thereto.
PERVIOUS AREA
Any material/surface that allows water to pass through at a rate equal to or greater than natural ground cover.
PIPE
A culvert, closed conduit, or similar structure (including appurtenances) that conveys stormwater.
PLAN
The stormwater management and erosion and sediment pollution control plans and narratives.
PLANNING COMMISSION
The Planning Commission of Manheim Borough, Lancaster County, Pennsylvania.
PROCESS WASTEWATER
Water that comes in contact with any raw material, product, by-product, or waste during any production or industrial process.
PROJECT SITE
The specific area of land where any regulated activities in the Borough are planned, conducted, or maintained.
QUALIFIED PERSON
Any person licensed by the Pennsylvania Department of State or otherwise qualified by law to perform the work required by this chapter.
RATE CONTROL
SWM controls used to manage the peak flows for the purposes of channel protection and flood mitigation.
RATIONAL FORMULA (RATIONAL METHOD)
A rainfall-runoff relation used to estimate peak flow.
RECORD PLAN
Where a regulated activity constitutes a subdivision or land development, the final subdivision or land development plan which contains the information the ordinance requires; where a regulated activity does not constitute a subdivision or land development, a stormwater management site plan containing all required information and prepared in a form acceptable to the office of the Recorder of Deeds for recording.
REGIONAL STORMWATER MANAGEMENT PLAN
A plan to manage stormwater runoff from an area larger than a single development site. A regional stormwater management plan could include two adjacent parcels, an entire watershed, or some defined area in between. Regional stormwater management plans can be prepared for new development or as a retrofit to manage runoff from already developed areas.
REGULATED ACTIVITIES
Any earth disturbance activities or any activities that involve the alteration or development of land in a manner that may affect stormwater runoff and that are specified in § 187-5 of this chapter.
REGULATED EARTH DISTURBANCE ACTIVITY
Activity involving earth disturbance subject to regulation under 25 Pa. Code Chapter 92, 25 Pa. Code Chapter 102, or the Clean Streams Law.
RELEASE RATE
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.
RELEASE RATE MAP
A graphical representation of the release rates for a specific area.
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.
RETENTION VOLUME/REMOVED RUNOFF
The volume of runoff that is captured and not released directly into the surface waters of this commonwealth during or after a storm event.
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 once every 25 years, or, stated in another way, the probability of a twenty-five-year storm occurring in any one year is 0.04 (i.e., a four-percent chance).
RIPARIAN BUFFER
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.
RIPARIAN FOREST BUFFER
A type of riparian buffer that consists of permanent vegetation that is predominantly native trees, shrubs and forbs along a watercourse that is maintained in a natural state or sustainably managed to protect and enhance water quality, stabilize stream channels and banks, and separate land use activities from surface waters.
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.
RUNOFF
Any part of precipitation that flows over the land surface.
SEDIMENT
Soils or other materials transported by surface water as a product of erosion.
SEDIMENTATION
The process by which mineral or organic matter is accumulated or deposited by the movement of water.
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 this chapter.
SEEPAGE PIT/SEEPAGE TRENCH
An area of excavated earth filled with clean, loose stone or similar coarse material into which surface water is directed for infiltration into the ground.
SHEET FLOW
Runoff which flows over the ground surface as a thin, even layer, not concentrated in a channel.
SOIL CONSERVATION SERVICE (SCS)
Now known as the National Resources Conservation Service (NRCS).
SOIL-COVER-COMPLEX METHOD
A method of runoff computation developed by the SCS (now NRCS) that is based on relating soil type and land use/cover to a runoff parameter called "curve number (CN)."
SOIL HORIZON
A layer of soil or soil material approximately parallel to the land surface and differing from adjacent genetically related layers in physical, chemical, and biological properties or characteristics such as color, structure, texture, consistency, kinds and number of organisms present, degree of acidity or alkalinity, etc.
SPILLWAY
A depression in the embankment of a pond or basin which is used to pass peak discharge greater than the maximum design storm controlled by the pond.
STATE WATER QUALITY REQUIREMENTS
The regulatory requirements to protect, maintain, reclaim, and restore water quality under Title 25 of the Pennsylvania Code, the Clean Streams Law and the Clean Water Act.
STORAGE
A volume above or below ground that is available to hold stormwater.
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 EVENT
A storm of a specific duration, intensity, and frequency.
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
Drainage runoff from the surface of the land resulting from precipitation or snow or ice melt.
STORM WATER MANAGEMENT ACT
Act of October 4, 1978, P.L. 864, No. 167, as amended 32 P.S. § 680.1 et seq., and as may be amended in the future.
STORMWATER MANAGEMENT BEST MANAGEMENT PRACTICES (SWM BMP)
See "BMPs."
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, road gutters, swales, storm sewers, pipes, BMPs, and infiltration structures.
STORMWATER MANAGEMENT OPERATION AND MAINTENANCE PLAN (O&M PLAN)
A plan, including a narrative, to ensure proper functioning of the SWM facilities in accordance with Article VI of this chapter.
STORMWATER MANAGEMENT PERMIT
A permit issued by Manheim Borough after the stormwater management site plan is unconditionally approved.
STORMWATER MANAGEMENT PLAN
The "Countywide Act 167 Plan" for Lancaster County for managing stormwater runoff adopted by Lancaster County as required by the Act of October 4, 1978, 32 P.S., P.L. 864, (Act 167) as amended, and known as the "Storm Water Management Act."
STORMWATER MANAGEMENT SITE PLAN
The 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.
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.
SUBWATERSHED AREA
The smallest drainage unit of a watershed for which stormwater management criteria have been established in the stormwater management plan.
SWALE
A low-lying stretch of land which gathers or carries surface water runoff.
SWM
Stormwater management.
SWM SITE PLAN
A stormwater management site plan.
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.
USDA
The United States Department of Agriculture or any agency successor thereto.
WATERCOURSE
A stream of water, river, brook, creek, or a channel or ditch for water, whether natural or man-made, having a defined bed and banks, with perennial or intermittent flow.
WATERSHED
The entire region or area drained by a watercourse.
WATERS OF THIS 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 this commonwealth.
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, including swamps, marshes, bogs, fens, 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 (USEPA) and the United States Army Corps of Engineers (USACOE).
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Editor's Note: See 53 P.S. § 10503.