[Ord. 2011-8, 11/3/2011, § 201]
The removal of the surface of the land through the combined action of man's activity and the natural process of a rate greater than would occur because of the natural process alone.
Act of October 4, 1978, P.L. 864, (Act 167), 32 P.S. § 680.1 et seq., as amended, and known as the "Storm Water Management Act."
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.
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.
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."
Pennsylvania Stormwater Best Management Practices Manual, as amended and updated.
The York County Conservation District, which district is as defined in § 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.
A stormwater management facility designed to transmit stormwater runoff and shall include streams, channels, swales, pipes, conduits, culverts, storm sewers, storm water detention/retention facilities, etc.
York County Pennsylvania.
A structure with appurtenant works, which carries a stream, or stormwater runoff under or through an embankment or fill.
An impoundment structure regulated by the Pennsylvania DEP regulations, 25 Pa. Code. Chapter 105.
The Pennsylvania Department of Environmental Protection. Also known as "DEP."
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."
An agent of the Township appointed by the Board of Supervisors for the purpose of administration, review or enforcement of any provisions of this chapter.
A structure designed to retard stormwater discharges by temporarily storing and releasing the runoff at a controlled rate.
The volume of runoff that is captured and released into the waters of this commonwealth at a controlled rate.
Any person, partnership, association, corporation or other entity, or any responsible person therein or agent thereof, that undertakes any regulated activity.
See "project site."
Any discharge of runoff not confined to a single point, location or channel (e.g., sheet flow or shallow concentrated flow).
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 23-A, "Disconnected Impervious Area."
An unstabilized land area where an earth disturbance activity is occurring or has occurred.
The DEP Erosion and Sediment Pollution Control Manual, as amended and updated.
A 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.
The natural process by which the surface of the land is worn away by water, wind or chemical action.
A site specific plan consisting of drawings, calculations and a narrative that identifies BMPs for the purpose of minimizing the potential for accelerated erosion and sedimentation before, during and after earth disturbance activity.
The dominant land cover during the five-year period immediately preceding a proposed regulated activity.
Federal Emergency Management Agency.
A relatively flat or low land area which is subject to partial or complete inundation from an adjoining or nearby stream, river or watercourse; and/or any area subject to the unusual and rapid accumulation of surface waters during a one-percent annual chance (or larger) flood.
The channel of a stream, river or watercourse and the adjacent land areas that must be reserved in order to discharge the one-percent annual chance flood without cumulatively increasing the floodplain water surface elevation. 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 50 feet landward from the top of the bank of the stream on both sides.
Planning and activities necessary for the management of forest land. 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.
The difference between the design flow elevation in the emergency spillway of a basin and the top of the basin embankment; and the difference between the design flow elevation of a swale and the top of a swale embankment.
The Hopewell Township Board of Supervisors.
A structure which meets the following:
[Added by Ord. No. 6-2023, 8/10/2023]
Is used for the production, processing, keeping, storing, sale or shelter of an agricultural commodity as defined in Section 2 of the Act of December 19, 1974, (P.L. 973, No. 319), known as the "Pennsylvania Farmland and Forest Land Assessment Act of 1974,"[1] or for the storage of agricultural equipment or supplies.
Refers to soils grouped according to their runoff-producing characteristics. The chief consideration is the inherent capacity of bare soil to permit infiltration of surface waters. 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).3, 4
A surface that prevents the absorption and infiltration of surface water into the ground. Impervious surfaces include, but are not limited to, any roof, parking lot, driveway, streets, patios and sidewalks, whether such surfaces and areas are constructed with concrete, asphalt, shale or crushed stone. Porous concrete and porous pavers will not be considered impervious surface under this chapter.
The entrance of surface water into the ground, usually at the soil-air interface.
A structure or other man-made feature designed to collect and retain runoff allowing it to infiltrate into the ground.
The volume of runoff collected and retained in an infiltration facility and infiltrated into the ground.
The York County Integrated Water Resources Plan, which plan includes Act 167 Plan elements and requirements.
A type of topography or landscape characterized by surface depressions, sinkholes, rock pinnacles/uneven bedrock surface, underground drainage and caves. Karst landscapes are formed on carbonate rocks, such as limestone or dolomite.
Includes any of the following activities:
The improvement of one lot or two or more contiguous lots, tracts or parcels of land for any purpose involving:
A group of two or more residential or nonresidential build initially or cumulatively, or a single nonresidential building on the number of occupants or tenure.
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.
A subdivision of land.
Development in accordance with § 503(1.1) of the Pennsylvania Municipalities Planning Code, 53 P.S. § 10503(1.1).
A qualified professional individual or firm appointed by the Board of Supervisors of the Township for the purpose of administration, review and enforcement of the provisions of this chapter.
Hopewell Township, York County, Pennsylvania.
National Pollution Discharge Elimination System.
USDA Natural Resources Conservation Service (previously SCS).
Operation and maintenance.
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.
Post-construction stormwater management plan.
The maximum rate of stormwater runoff occurring at a specified location during a specified storm event.
See "infiltration."
An individual, partnership, public or private association or corporation, limited liability company, firm, trust, estate, municipality, governmental unit, public utility or any other legal entity whatsoever which is recognized by law as the subject of rights and duties. Whenever used in any section prescribing or imposing a penalty, the term "person" shall include the members of a partnership, the officers, members, managers, servants and agents of an association or limited liability company, officers, agents and servants of a corporation, and the officers of a municipality or county, but shall exclude any department, board, bureau or agency of the Commonwealth of Pennsylvania.
Any area not defined as impervious or semi-pervious.
A culvert, closed conduit or similar structure (including appurtenances) that conveys stormwater.
The specific area of land where any regulated activities in the Township are planned, conducted or maintained.
Any person licensed by the State of Pennsylvania or otherwise qualified by law to perform the work required by this chapter.
A rainfall-runoff relation used to estimate peak flow.
Activities that may affect stormwater runoff and that are defined in § 23-105, "Applicability."
Activity involving earth disturbance subject to regulation under 25 Pa. Code, Chapter 92, 25 Pa. Code, Chapter 102, or the Clean Streams Law, 35 P.S. § 691.1 et seq.
The rate at which runoff is released from a site or subarea measured in cubic feet per second.
A reservoir, formed from soil or other material, which is designed to permanently retain a certain amount of stormwater which also may be designed to temporarily detain surface runoff for a period of time sufficient to reduce the velocity and rate of surface flows leaving a site.
The volume of runoff that is captured and not released directly into the surface waters of this commonwealth during or after a storm event.
The average interval, in years, within which a storm event of a given magnitude can he expected to occur. For example, the twenty-five-year return period rainfall would be expected to occur on average once every 25 years; i.e., the annual probability of a twenty-five-year storm is 0.04 (four-percent annual chance).
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).
A vertical pipe or inlet structure extending from the bottom of a pond that is used to control the discharge rate from the pond for specified design storm.
Any part of atmospheric precipitation, or snow or ice melt, that is not absorbed or infiltrated into the ground and flows over the land.
Soils or other materials transported by surface water as a product of erosion.
Any non-vegetated surface that impedes the absorption and infiltration of surface water into the ground. Semi-pervious surfaces do not include engineered, non-vegetated surfaces including, but not limited to, porous concrete and porous pavers, which are considered pervious.
Water flow with a relatively thin and uniform depth.
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).
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 principal outlet of the facility.
The regulatory requirements to protect, maintain, reclaim and restore water quality under Title 25, Pa. Code, and the Clean Streams Law, 35 P.S. § 691.1 et seq.
The number of times that a given storm event occurs on average in a stated period of years.
A pipe or a system of pipes and appurtenances, which intercepts and conveys stormwater runoff, but excludes sewage, industrial wastes and similar discharges.
Water generated from any form of atmospheric precipitation.
Is abbreviated as "BMPs" or "SWM BMPs" throughout this chapter.
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, infiltration facilities and all SWM BMPs. Stormwater management facilities are abbreviated "SWM facilities" throughout this chapter.
Parts and/or elements of the York County Integrated Water Resources Plan which incorporate the requirements of the Act of October 4, 1978, P.L. 864, (Act 167), 32 P.S. § 680.1 et seq., as amended, and known as the "Storm Water Management Act."
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 and/or DEP.
The smallest drainage unit of a watershed for which stormwater management criteria have been established in the Stormwater Management Plan.
As defined in the Pennsylvania Municipalities Planning Code, Act of July 31, 1968, P.L. 805, No. 247, 53 P.S. § 10101 et seq.
Stormwater management.
United States Department of Agriculture.
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.
Region or area drained by a river, watercourse or other surface water of this commonwealth.
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, fens and similar areas.
York County Conservation District.
[1]
Editor's Note: See 72 P.S. § 5490.2.