When used this Part 2, the following words, terms and phrases shall have the following meaning, unless expressly stated otherwise or unless the context clearly indicates otherwise:
The bed and banks of watercourses, which confine and convey the normal flow of the water, either continuously or intermittently.
A receptacle for collecting and holding rainwater for reuse for irrigation or drinking water.
The Lehigh County Conservation District.
A natural or man-made drainage channel that has an upstream contributing area of 10 acres.
A pipe, conduit or similar structure, including appurtenant works, which carries stormwater.
Any artificial barrier, together with its appurtenant works, constructed for the purpose of impounding or storing water or any other fluid or semifluid or any refuse bank, fill or structure for highway, railroad or other purposes which does or may impound water or any other fluid or semifluid.
The magnitude of precipitation from a storm event measured in probability of occurrence (such as a fifty-year storm) and duration (such as twenty-four-hour rainfall) and used in computing stormwater management systems.
A natural or man-made area in which stormwater is temporarily detained and from which said water is slowly released at a rate compatible with sound stormwater and soil management practices as approved by the Township Engineer. Unless otherwise stated, this term shall include a "retention basin."
A person, partnership, association, corporation or other entity, or any responsible person therein or agent thereof that undertakes any regulated activity of this Part 2.
The specific tract of land for which a regulated activity is proposed.
Any activity involving the clearing, excavating, storing, grading, filling or transporting of soil or any other activity which causes soil to be exposed to the danger of erosion.
A channel with or without a supporting ridge on the lower side constructed to intercept and divert surface runoff.
The removal of surface water or groundwater from land by drains, grading or other means and includes control of runoff to minimize erosion and sedimentation during and after construction or development and means necessary for water supply preservation or prevention or alleviation of flooding.
A right granted by a landowner to the Township or other grantee allowing the use of an area of land for stormwater management.
The documentation of the proposed stormwater management controls, if any, to be used for a given development site.
A man-made deposit of soil, rock or other material.
The detachment and movement of soil or rock fragments by water, wind, ice and/or gravity.
A plan which fully indicates necessary land treatment measures, including a schedule for the timing of their installation, which will effectively minimize soil erosion and sedimentation and which is acceptable to the County Conservation District.
An act by which soil or soils are cut into dug, quarried, uncovered, removed, displaced or relocated.
The vertical location of the existing ground surface prior to cutting or filling.
The final elevation of the ground surface conforming to the proposed design.
The incremental depth, provided as a safety factor of design, in a stormwater management structure above that required to convey the design runoff event.
Any stripping, cutting, filling, stockpiling or any combination thereof and shall include the land in its cut or filled condition.
The first floor of a building other than a cellar or basement.
The process of stormwater entering into the ground to replenish the underground water table.
The computer-based hydrologic modeling technique adapted to the Maiden Creek and Sacony Creek Watersheds for the Act 167 Plan. The model has been calibrated to reflect actual recorded flow values by adjusting key model input parameters.
A surface which substantially prevents the percolation of water into the ground.
A structure designed to direct runoff into the ground, e.g., trench drain, seepage pit, seepage trench.
Lowest floor of the enclosed area, including basement.
Lehigh Valley Planning Commission.
Any stream segment or other conveyance facility used as a reach in the Jordan Creek, Little Lehigh Creek, Maiden Creek, or the Sacony Creek hydrologic model.
A method for calculation of velocity of flow (feet per second) and flow rate (cubic feet per second) in open channels based upon channel shape, roughness, depth of flow and slope. Open channels may include closed conduits, provided that the flow is not under pressure.
The application of plant or other suitable materials on the soil's surface to conserve moisture, hold soil in place and aid in establishing plant cover.
The ground surface in its original state before any grading, excavating, or filling.
The Natural Resources Conservation Service of the U.S. Department of Agriculture.
Any structure, materials, fill or activity that would impede, retard or change natural or approved stormwater flows.
The maximum rate of flow of stormwater runoff at a given location and time resulting from a specified storm event.
The computer-based hydrologic modeling technique adapted to the Jordan Creek and Little Lehigh Creek Watersheds for the Act 167 Plan. The model has been calibrated to reflect actual recorded flow values by adjusting key model input parameters.
A method of peak runoff calculation using a standardized runoff coefficient ("rational c"), acreage of tract and rainfall intensity determined by return period and by the time necessary for the entire tract to contribute runoff. The rational method formula is stated as follows: Q = ciA, where "Q" is the calculated peak flow rate in cubic feet per second, "c" is the dimensionless runoff coefficient (see Appendix C),[1] "i" is the rainfall intensity in inches per hour, and "A" is the area of the tract in acres.
Any of the 257 man-made runoff conveyance channels used for modeling purposes to connect the subareas (within the Jordan Creek, Little Lehigh Creek, Maiden Creek, and the Sacony Creek Watersheds) and transport flows, as described in the LVPC stormwater management plans.
Actions or proposed action which impact upon proper management of stormwater runoff and which are governed by this Part 2.
The percentage of the predevelopment peak rate of runoff for a development site which the post-development peak rate of runoff must be controlled to protect downstream areas.
A natural or man-made area in which stormwater is retained on a long-term basis.
The average interval in years over which an event of a given magnitude can be expected to recur. For example, the twenty-five-year return period rainfall or runoff event would be expected to recur on the average once every 25 years.
That part of precipitation that flows over land.
The deposition of solid material (both mineral and organic) that has been transported from its site of origin by any means of erosion.
A barrier or dam built across a waterway or at other suitable locations to retain rock, sand, gravel, silt or other materials to prevent these materials from entering a creek, river, stream or lake.
An area of excavated earth filled with loose stone or similar material and into which surface water is directed for infiltration into the ground.
Uncompacted aggregate (e.g., sand, gravel, crushed stone, etc.), porous pavement and infiltration structures.
A method of runoff computation developed by NRCS which is based upon relating soil type and land use/cover to a runoff parameter called a "curve number."
Includes substantial improvements and means the date the building permit was issued, provided the actual start of construction, repair, reconstruction or improvements was within 180 days of the permit date. The actual start means the first placement of permanent construction of a structure (other than a mobile home) on a site such as the pouring of slabs or footings or any work beyond the stage of excavation.
A reservoir routing procedure based on solution of the continuity equation (inflow minus outflow equals the change in storage for a given time interval) and based on outflow being a unique function of storage volume.
A system of pipes or other conduits that carries intercepted runoff but is not intended to carry sanitary sewer or industrial waste.
The holding or slowing down of stormwater runoff to limit the amounts of post-development runoff (release date) to a required percentage of the predevelopment amounts of runoff during peak periods.
Individual areas as they appear on the Jordan Creek, Little Lehigh Creek, Maiden Creek, and the Sacony Creek release rate maps. Each district is assigned an allowable release rate. (See "stormwater management district, general.")
Areas of the Township not included in the Jordan Creek, Little Lehigh Creek, Maiden Creek, and the Sacony Creek Watersheds.
The plans for managing stormwater runoff adopted by the Lehigh Valley Planning Commission for the Jordan Creek, Little Lehigh Creek, Maiden Creek, and the Sacony Creek Watersheds as required by the Act of October 4, 1978, P.L. 864, (Act 167), and known as the Storm Water Management Act.[2]
A watercourse.
The smallest unit of watershed breakdown for hydrologic modeling purposes for which the runoff control criteria have been established in the LVPC stormwater management plans.
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, transfer of ownership or building or lot development.
A low-lying stretch of land which gathers or carries stormwater runoff.
Stabilization of erosive sediment producing materials.
The Township of Weisenberg, County of Lehigh, in the Commonwealth of Pennsylvania.
Stabilization of erosive or sediment producing areas, by establishing permanent long-term vegetative growth cover, by seeding of the soil or planting sod.
Any natural or artificial waterway, stream, river, creek, ditch, channel, millrace, canal, gully, ravine or wash in which water flows in a definite direction or course either continuously or intermittently and which has a definite channel and bed. This term shall include any area adjacent thereto subject to inundation by reason of overflow of floodwaters.
The area which contributes stormwater runoff to the Jordan Creek as it appears on the drawing entitled "Plate I, Jordan Creek Watershed Release Rate Map" (as prepared by the Lehigh Valley Planning Commission).
The area which contributes stormwater runoff to the Little Lehigh Creek as it appears on the drawing entitled "Plate I, Little Lehigh Creek Study Area Release Rate Map" (as prepared by the Lehigh Valley Planning Commission).
The area which contributes stormwater runoff to the Maiden Creek as it appears on the drawing entitled "Plate I, Maiden Creek Watershed Release Map" (as prepared by the Joint Planning Commission).
The area which contributes stormwater runoff to the Sacony Creek as it appears on the drawing entitled "Plate I, Sacony Creek Watershed" (as prepared by the Lehigh Valley Planning Commission).
[1]
Editor's Note: Said appendix is included as an attachment to this chapter.
[2]
Editor's Note: See 32 P.S. § 680.1 et seq.