Township of West Manheim, PA
York County
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Table of Contents
Table of Contents

§ 221-10 Definitions.

As used in this chapter, the following terms shall have the meanings indicated:
ACT 167
Act of October 4, 1978, P.L. 864, (Act 167), as amended, and known as the "Stormwater Management Act."[1]
AGRICULTURAL ACTIVITY
Activities associated with agriculture, such as, but not limited to, agricultural cultivation, agricultural operations, and animal heavy-use areas. This includes the work of producing crops, including tillage, land clearing, plowing, disking, harrowing, planting, harvesting crops or pasturing and raising of livestock and installation of conservation measures. Construction of new buildings or impervious area is not considered an agricultural activity.
APPLICANT
A landowner, developer, or other person who has filed an application to the Township for approval to engage in any regulated activity at a project site in the Township.
BEST MANAGEMENT PRACTICE (BMP)
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: "structural" or "nonstructural." In this chapter, nonstructural BMPs or measures refer to operational and/or behavior-related practices that attempt to minimize the contact of pollutants with stormwater runoff, whereas structural BMPs or measures are those that consist of a physical device or practice that is installed to capture and treat stormwater runoff. Structural BMPs include, but are not limited to, a wide variety of practices and devices, from large-scale retention ponds and constructed wetlands, to small-scale underground treatment systems, infiltration facilities, filter strips, low-impact design, bioretention, wet ponds, permeable paving, grassed swales, riparian or forested buffers, sand filters, detention basins, and manufactured devices. Structural stormwater BMPs are permanent appurtenances to the project site.
BMP MANUAL
Pennsylvania Stormwater Best Management Practices Manual, as amended and updated.
CLEAN WATER ACT
The Federal Water Pollution Control Act, 33 U.S.C. § 1251 et seq., and any subsequent amendments thereto.
CONSERVATION DISTRICT
The York County Conservation District, which district is as defined in Section 3(c) of the Conservation District Law [3 P.S. § 851(c)] that has the authority under a delegation agreement executed with DEP to administer and enforce all or a portion of the regulations promulgated under 25 Pa. Code Chapter 102.
COUNTY
York County, Pennsylvania.
CULVERT
A structure which carries surface water through an obstruction.
DAM
An impoundment structure regulated by the Pennsylvania DEP Chapter 105 regulations.[2]
DEP
The Pennsylvania Department of Environmental Protection.
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. Also see "return period."
DETENTION BASIN
A structure designed to retard stormwater runoff by temporarily storing and releasing runoff 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 appropriate and approved Act 167 plans.
DETENTION VOLUME
The volume of runoff that is captured and released into the waters of this commonwealth at a controlled rate.
DEVELOPER
Any person, partnership, association, corporation or other entity, or any responsible person therein or agent thereof, that undertakes any regulated activity.
DEVELOPMENT SITE (SITE)
See "project site."
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 as specified in Appendix B, Disconnected Impervious Area,[3] of this chapter.
DISTURBED AREA
An unstabilized land area where an earth disturbance activity is occurring or has occurred.
DOWN-SLOPE PROPERTY LINE
That portion of a property line of a lot or parcel of land being developed located such that overland or pipe flow from the development site would be directed toward it.
DRAINAGE CONVEYANCE FACILITY
A stormwater management facility designed to transmit stormwater runoff, including, but not limited to, streams, channels, swales, pipes, conduits, culverts and storm sewers.
DRAINAGE EASEMENT
A limited right of use granted in private land, allowing the use of private land for stormwater management purposes, wherein no structure may be constructed.
E&S MANUAL
Erosion and Sedimentation Control Manual, as amended or updated.
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; road maintenance; building construction; and the moving, depositing, stockpiling, or storing of soil, rock, or earth materials.
EROSION
The natural process by which the surface of the land is worn away by water, wind, or chemical action.
EROSION AND SEDIMENTATION CONTROL PLAN
A site-specific plan, consisting of both drawings and a narrative, that identifies BMPs to minimize accelerated erosion and sedimentation before, during and after earth disturbance activity.
EXISTING CONDITION
The dominant land cover during the five-year period immediately preceding a proposed regulated activity.
FEMA
Federal Emergency Management Agency.
FLOODPLAIN
Any land area susceptible to inundation by water from any natural source as delineated by applicable FEMA maps and studies as being a special flood hazard area.
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 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 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 forestland. These include conducting a timber inventory, preparation of forest management plans, silvicultural treatment, cutting budgets, logging road design and construction, timber harvesting, site preparation, and reforestation.
GROUNDWATER RECHARGE
Replenishment of existing natural underground water supplies.
HAZARDOUS MATERIALS/SUBSTANCES
Any material, including any substance, waste, or combination thereof, which because of its quantity, concentration, or physical, chemical, or infectious characteristics may cause, or significantly contribute to, a substantial present or potential hazard to human health, safety, property, or the environment when improperly treated, stored, transported, disposed of, or otherwise managed.
HYDROLOGIC SOIL GROUP (HSG)
Infiltration rates of soils vary widely and are affected by subsurface permeability as well as surface intake rates. 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 [NRCS (NOTE: See Article X, References, § 221-46C and D.)].
IMPERVIOUS SURFACE (IMPERVIOUS AREA)
A surface that prevents the infiltration of water into the ground. Impervious surfaces (or areas) shall include, but not be limited to, roofs, additional indoor living spaces, patios, garages, storage sheds and similar structures, streets, driveways, access drives, parking areas and sidewalks. Any areas designed to be covered by loose surfacing materials such as gravel, stone and/or crushed stone, and intended for storage of and/or travel by motorized or nonmotorized vehicles, or travel by pedestrians shall be considered impervious. Surfaces or areas designed, constructed and maintained to permit infiltration as specified herein may be considered pervious. For the purposes of this chapter, a surface or area shall not be considered impervious if such surface or area does not diminish the capacity for infiltration of stormwater for storms up to, and including, a two-year twenty-four-hour storm event.
INFILTRATION
Water flowing downward though the ground surface.
INFILTRATION STRUCTURES
A structure designed to direct runoff into the ground (e.g., french drains, seepage pits, seepage trench).
IWRP
The York County Integrated Water Resources Plan, which plan includes the Act 167 plan elements and requirements.
KARST
A type of topography or landscape characterized by 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 (DEVELOPMENT)
Inclusive of any or all of the following meanings:
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 buildings; or
(2) 
The division or allocation of land or space between or among two or more existing or prospective occupants by means of, or for the purpose of, streets, common areas, leaseholds, condominiums, building groups, or other features;
B. 
Any subdivision of land;
C. 
Development in accordance with Section 503(1.1) of the PA Municipalities Planning Code.[4]
MUNICIPALITY
West Manheim Township, York County, Pennsylvania.
NPDES
National Pollution Discharge Elimination System.
NRCS
USDA Natural Resources Conservation Service (previously SCS).
O&M
Operation and maintenance.
O&M PLAN
Operation and maintenance plan.
PCSWMP
Post-construction stormwater management plan.
PEAK DISCHARGE
The maximum rate of stormwater runoff from a specific storm event.
PERCOLATION
The downward movement, under the influence of gravity, of water under hydrostatic pressure through interstices of the soil or rock.
PERSON
An individual, partnership, public or private association or corporation, firm, trust, estate, municipality, governmental unit, public utility or any other legal entity whatsoever. Whenever used in any section prescribing or imposing a penalty, the term "person" shall include the members of a partnership, the officers, agents and servants of a corporation and the officers of a municipality.
PERVIOUS AREA
Any area not defined as impervious.
PROJECT SITE
The specific area of land where any regulated activities in the Township are planned, conducted, or maintained.
QUALIFIED PERSON
Any person licensed by the State of Pennsylvania or otherwise qualified by law to perform the work required by this chapter.
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. This term shall also include activities that directly alter or affect the characteristics of runoff (stormwater, groundwater, potable water, etc.) over and/or discharging from a site.
REGULATED EARTH DISTURBANCE ACTIVITY
Activity involving earth disturbance subject to regulation under 25 Pa. Code Chapter 92a, 25 Pa. Code Chapter 102, or the Clean Streams Law.[5]
[6]
RETENTION BASIN
An impoundment in which stormwater is stored and not released during a 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 occur one time. For example, the twenty-five-year return period rainfall would be expected to occur on 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 best management practice that is an area of permanent vegetation along surface waters. (Such areas serve as natural vegetative filters between upland landscapes and waterways.)
RISER
A vertical pipe extending from the bottom of a pond or other water impoundment that is used to control the discharge rate from the pond or impoundment for a specified design storm.
ROOFTOP DETENTION
Temporary ponding and gradual release of stormwater falling directly onto roof surface by incorporating control-flow roof drains into building design.
RUNOFF
Any part of precipitation that flows over the land.
RUNOFF CHARACTERISTICS
The surface components on any watershed which either individually or in any combination thereof directly affect the rate, amount and direction of stormwater runoff. These may include, but are not limited to, vegetation, soils, slopes and any type of man-made landscape alterations.
SEDIMENT
Soils or other materials transported by surface water as a product of erosion.
SEDIMENT BASIN
A barrier, dam, retention or detention basin designed to retain sediment.
SEEPAGE PIT/SEEPAGE TRENCH
An area of excavated earth filled with loose stone or similar materials into which surface water is directed for infiltration into the ground.
SEMIPERVIOUS SURFACE
A surface which permits a limited amount of vertical transmission of water.
SHEET FLOW
Water flow with a relatively thin and uniform depth.
SOIL COVER COMPLEX METHOD
A method of runoff computation in NRCS publication "Urban Hydrology for Small Watersheds," Technical Release No. 55.
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 or basin.
STATE WATER QUALITY REQUIREMENTS
The regulatory requirements to protect, maintain, reclaim, and restore water quality under Title 25 of the Pennsylvania Code and the Clean Streams Law.[7]
STORM DRAIN SYSTEM
Publicly or privately owned faculties by which stormwater is collected and/or conveyed, including, but not limited to, any roads with drainage systems, municipal streets, gutters, curbs, inlets, piped storm drains, pumping facilities, retention and detention basins, natural and human-made or altered drainage channels, reservoirs, and other drainage structures.
STORM FREQUENCY
The number of times that a given storm event occurs on average in a stated period of years.
STORM SEWER
A pipe or conduit, or a system of pipes or conduits, which intercepts and carries surface stormwater runoff, but excludes sewage, industrial wastes and similar discharges.
STORMWATER
Drainage runoff from the surface of the land resulting from precipitation or snow or ice melt.
STORMWATER MANAGEMENT BEST MANAGEMENT PRACTICES
Is abbreviated as BMPs or SWM BMPs throughout this chapter.
STORMWATER MANAGEMENT DISTRICT WATERSHED MAPS
West Manheim Township is divided into two watershed districts. District 1 includes areas that drain to Codorus Creek, and District 2 includes areas that drain to the Furnace Creek Watershed. These areas are shown in more detail on the Stormwater Management District Watershed Map included in Appendix C[8] of this chapter.
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 facilities.
STORMWATER MANAGEMENT PLAN
Parts and/or elements of the York County Integrated Water Resource Plan, which plan incorporates the requirements of the Act of October 4, 1978, P.L. 864 (Act 167), as amended, and known as the "Storm Water Management Act."[9]
STORMWATER MANAGEMENT SITE PLAN
The plan prepared by the developer or his representative indicating how stormwater runoff will be managed at the development site in accordance with this chapter. "Stormwater management site plan" will be designated as "SWM site plan" throughout this chapter. For all NPDES permitted sites, the stormwater management site plan shall include, and be consistent with, the erosion and sediment control plan as submitted to the York County Conservation District (YCCD) and/or DEP.
SUBDIVISION
The division or redivision of a lot, tract or parcel of land by any means into two or more lots, tracts or 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 devises, 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.
SWALE
A low-lying stretch of land which gathers and/or carries surface water runoff.
SWM
Stormwater management.
TOWNSHIP
West Manheim Township, York County, Pennsylvania.
USDA
United States Department of Agriculture.
WATERCOURSE
A stream of water; river, brook, creek, or a channel or ditch for water, whether natural or man-made.
WATERS OF THIS COMMONWEALTH
Any and all rivers, streams, creeks, rivulets, impoundments, ditches, watercourses, storm sewers, lakes, dammed water; wetlands, ponds, springs, and all other bodies or channels of conveyance of surface and underground water, or parts thereof, whether natural or artificial, within or on the boundaries of this commonwealth.
WATERSHED
Region or area drained by a river, watercourse, or other surface water of this commonwealth.
WETLAND
Areas that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions, including swamps, marshes, bogs, and similar areas.
YCCD
York County Conservation District.
[1]
Editor's Note: See 32 P.S. § 680.1 et seq.
[2]
Editor's Note: See 25 Pa. Code Chapter 105.
[3]
Editor's Note: Said appendix is included as an attachment to this chapter.
[4]
Editor's Note: See 53 P.S. § 10503(1.1).
[5]
Editor's Note: See 35 P.S. § 691.1 et seq.
[6]
Editor's Note: Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. I).
[7]
Editor's Note: See 35 P.S. § 691.1 et seq.
[8]
Editor's Note: Said appendix is included as an attachment to this chapter.
[9]
Editor's Note: See 32 P.S. § 680.1 et seq.