[Ord. 334 (92-1), 2/5/1992, Art. II]
The removal of the surface of land through the combined action of man's activities and natural process at a rate greater than would occur because of the natural processes alone.
An underground reservoir or tank for storing rainwater.
Flow following a defined path with depth and velocity. Aggregation, of diffused flow and riverlets.
The Conservation District serving York County.
A pipe, conduit or similar structure including appurtenant works which carries surface water.
The magnitude of precipitation from a storm event measured in probability of occurrence (e.g., fifty-year storm) and duration (e.g., 24 hour), and used in computing stormwater management control systems.
A basin designed to retard stormwater runoff by temporarily storing runoff and releasing it at a predetermined rate. A detention basin can be designed to drain completely after a storm event, or it can be designed to contain a permanent pool of water.
A person or person, partnership, association, corporation or other entity, or any responsible person therein or agent thereof, that undertakes the activities covered by this Chapter.
The improvement or alteration of any lot, parcel, tract or piece of land for residential, commercial or industrial purposes in any manner which increases the quality of impervious material cover, such as the construction or expansion of buildings, parking facilities, streets, etc.
The specific tract of land for which a regulated activity is proposed.
Sheet flow — an overland flow or downslope movement of water taking the form of a thin continuous film over relatively smooth soil, rock, paving or vegetation, etc., and not concentrated into channels larger than nonerosive riverlets.
A channel and a ridge constructed to a predetermined grade across a slope, and designed to collect and divert runoff from slopes which are subject to erosion.
A right granted by a landowner to a grantee, allowing the use of private land for stormwater management purposes.
The documentation of the proposed stormwater management controls, if any, to be used for a given development site, the contents of which are established in § 23-403.
Replenishment of existing natural underground water supplies.
A surface which prevents the percolation of water into the ground.
A structure designed to direct runoff into the ground, e.g., French drains, seepage pits, seepage trench.
(A) the improvement of one lot of 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) a subdivision of land.
Any activity involving grading, tilling, digging or filling of ground, or stripping of vegetation, or any other activity which causes land to be exposed to the danger of erosion.
Glen Rock Borough, York County, Pennsylvania.
The maximum rate of flow of water at a given point and time resulting from a specified storm event.
Actions or proposed actions which impact upon proper management of stormwater runoff and which are governed by this Chapter as specified in § 23-104.
The percentage of the predevelopment peak rate of runoff for a development site to which the post-development peak rate of runoff must be controlled to protect downstream areas.
The average interval in years over which an event of a given magnitude can be expected to occur. For example, the twenty-five-year return period rainfall or runoff event would be expected to recur on the average once every 25 years.
The part of precipitation which flows over the land.
Soil Conservation Service, U.S. Department of Agriculture.
An area of excavated earth filled with loose stone or similar material into which surface water is directed for infiltration into the ground.
A surface such as stone, rock, concrete or other materials which permits some vertical transmission of water.
A method of runoff computation developed by SS and found in its publication "Urban Hydrology for Small Watersheds," Technical Release No. 55, SCS, January, 1975.
A reservoir routing procedure based on solution of the continuity equation (inflows 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 which carries intercepted surface runoff, street water and other wash waters, or drainage, but excludes domestic sewage and industrial wastes.
The plan addressing stormwater management for a specific regulated activity, prepared in accordance with Part 4.
A watercourse.
The smallest unit of watershed breakdown for hydrologic modeling purposes for which the runoff control criteria have been installed in the stormwater management plan.
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.
A low lying stretch of land which gathers or carries surface water runoff.
Any channel of conveyance of surface water having defined bed and banks, whether or not artificial, with perennial or intermittent flow.
The plan for managing stormwater runoff accepted by York County for the South Branch Codorus Creek Watershed as required by Act of October 4, 1989, P.L. 864, (Act 167), and known as the "Stormwater Management Act", 32 P.S. § 680.1 et seq.