[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.
