For the purposes of this chapter, certain terms and words used herein shall be interpreted as follows:
A. 
Words used in the present tense include the future tense; the singular number includes the plural, and the plural number includes the singular; words of masculine gender include feminine gender; and words of feminine gender include masculine gender.
B. 
The words "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. 
Terms:
ACCELERATED EROSION
The removal of the surface of the land through the combined action of man's activities and natural processes at a rate greater than would occur because of the natural processes alone.
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 developer who has filed an application for approval to engage in any regulated activities as defined in § 257-4 of this chapter.
BEST MANAGEMENT PRACTICE (BMP)
Stormwater structures and facilities designed or used to maintain or improve the water quality of surface runoff. BMP's may be structural (basins and seepage pits), nonstructural (vegetation filter strips and buffers) or managerial techniques (maintenance practices) that may be used singly or in combination to achieve water quality.
CISTERN
An underground reservoir or tank for storing rainwater.
CONSERVATION DISTRICT
The Washington 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.
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 (DESIGNATED REPRESENTATIVE)
Any person or consultant designated by the Township governing body to administer, review or enforce the provisions of this chapter whether by contract or by 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.
DEVELOPER and/or SUBDIVIDER
A person, partnership, association, corporation, or other entity, or any responsible person therein or agent thereof, that undertakes any PA DEP regulated activity of this chapter.
DEVELOPMENT SITE
The specific tract of land for which a regulated activity is proposed.
DRAINAGE EASEMENT
A right granted by a landowner to a grantee, allowing the use of private land for stormwater management purposes.
DRAINAGE PLAN
The documentation of the stormwater management system, if any, to be used for a given development site, the contents of which are established in this chapter; Stormwater Management Plan and Report Package.
ENGINEER
A person, partnership or corporation which shall have a license issued by the Commonwealth of Pennsylvania as a professional engineer and which shall prepare all stormwater management plans and reports required under this chapter and which shall seal with the professional seal all plans and documents submitted under this chapter.
EROSION
The movement of soil particles by the action of water, wind, ice, or other natural forces.
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 included are areas that comprise Group 13 soils, as listed in Appendix A of the Pennsylvania Department of Environmental Protection (PA DEP) Technical Manual for Sewage Enforcement Officers (as amended or replaced from time to time by PA DEP).
GRADE
The inclination, with the horizontal, of a road, unimproved land, etc., which is generally expressed by stating the vertical rise or fall as a percentage of the horizontal distance.
GRADE GROUNDWATER RECHARGE
Replenishment of existing natural underground water supplies.
IMPERVIOUS SURFACE
A surface that prevents the percolation of water into the ground.
IMPROVEMENTS
Those physical additions and changes to the land that may be necessary to produce usable and desirable lots.
INFILTRATION STRUCTURE
A structure designed to direct runoff into the ground (e.g., French drains, seepage pits, seepage trench).
LAND DEVELOPMENT
(1) 
The improvement of one lot or two of more contiguous lots, tracts, or parcels of land for any purpose involving a) a group of two or more buildings, or b) the division or allocation of land or space between or among two or more existing or prospective occupants by means of, or for the of streets, common areas, leaseholds, condominiums, building groups, or other features;
(2) 
Any subdivision of land;
(3) 
Any lot improvements regulated under Chapter 320, Zoning.
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 natural condition of the land.
LOT
A designated parcel, tract or area of land established by a plan or otherwise as permitted by law and to be used, developed or built upon as a unit.
MUNICIPALITY
Cross Creek Township, Washington County, Pennsylvania.
NRCS
U.S. Department of Agriculture Natural Resources Conservation Service.
[Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. I)]
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.
PEAK DISCHARGE
The maximum rate of stormwater runoff from a specified storm event.
PERFORMANCE GUARANTEE
Any security which may be accepted in lieu of a requirement that certain improvements be made before the Township gives final approval of a plan, including performance bonds, escrow agreements, letters of credit, and any other collateral or surety agreements.
PIPE
A culvert, closed conduit, or similar structure (including appurtenances) that conveys stormwater.
PLAN, FINAL
A complete and exact subdivision or land development plan (including all required supplementary data), prepared for official recording of a major subdivision, to define property rights and proposed streets and other improvements, prepared by a registered surveyor, all as more fully set forth in Chapter 270, Subdivision and Land Development.
PLAN, PRELIMINARY
A tentative subdivision or land development plan (including all required supplementary data), in lesser detail than a final plan, showing, among other things, topographical data and approximate proposed street and lot layout as a basis for consideration of a major subdivision prior to preparation of a final plan, all as more fully set forth in Chapter 270, Subdivision and Land Development.
PMF, PROBABLE MAXIMUM FLOOD
The flood that may be expected from the most severe combination of critical meteorologic and hydrologic conditions that are reasonably possible in an area. The PMF is derived from the probable maximum precipitation (PMP) as determined on the basis of data obtained from the National Oceanographic and Atmospheric Administration (NOAA).
REGULATED ACTIVITIES
Actions or proposed actions that have an impact on stormwater runoff and that are specified in this chapter.
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, once every 25 years.
RUNOFF
Any part of precipitation that flows over the land surface.
SEDIMENT BASIN
A barrier, dam, retention, or detention basin located and designed to retain rock, sand, gravel, silt, or other material transported by water.
SEDIMENTATION
The process of 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.
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 a curve number (CN).
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 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.
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, transfer of ownership, or building or lot development.
WAIVER
Intentional relinquishing of a specific right, claim or privilege by the governing body.
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, ferns, and similar areas.