In order to protect the health, safety, and general welfare
of the residents of the Municipality, as well as to protect, sustain,
and enhance the surface water and groundwater resources of the Municipality,
drainage and stormwater management practices shall be utilized as
directed herein to achieve the following goals and objectives:
A. Accommodate site development and redevelopment in a manner that is
consistent with (or reestablishes) the natural hydrologic characteristics
of each watershed and sustains groundwater recharge, stream base flows,
stable stream channel (geomorphology) conditions, the carrying capacity
of streams and their floodplains, groundwater and surface water quality.
B. Reduce and minimize the volume of stormwater generated.
C. Protect natural infiltration and groundwater recharge rates in order
to sustain groundwater supplies and stream base flows and to prevent
degradation of surface water and groundwater quality.
D. Prevent scour and erosion of stream banks and streambeds.
E. Maintain runoff characteristics of the site after development or
redevelopment that are consistent with the predevelopment conditions
of the receiving streams, and in accordance with the requirements
of the Turtle Creek Watershed Act 167 Stormwater Management Plan.
F. Protect water quality by removing and/or treating pollutants prior
to discharge to groundwater and surface waters throughout the Municipality,
and to protect, restore, and maintain the chemical, physical, and
biological quality of groundwater and surface waters.
G. Reduce flooding impacts and prevent a significant increase in surface
runoff rates and volumes, predevelopment to post-development, which
could worsen flooding downstream in the watershed, in general, to
preserve and restore the natural flood-carrying capacity of streams
and their floodplains.
H. Protect adjacent lands from adverse impacts of direct stormwater
discharges.
I. Ensure effective long-term operation and maintenance of all permanent
stormwater management facilities.
J. Maintain natural drainage patterns and encourage the use of natural
drainage systems.
K. Treat and release stormwater as close to the source of runoff as
possible using a minimum of structures and maximizing reliance on
natural processes.
L. Provide procedures and performance standards for stormwater planning
and management.
M. Protect and/or restore natural hydrologic characteristics and habitats
wherever possible throughout the watershed systems.
N. Address certain requirements of the municipal separate storm sewer
system (MS4), National Pollution Discharge Elimination System (NPDES),
Phase II stormwater regulations.
O. Reduce the impacts of runoff from existing developed sites undergoing
redevelopment while encouraging development and redevelopment.
P. Meet legal water quality requirements under state law, including
regulations at 25 Pa. Code Chapter 93.4a, to protect and maintain
existing uses and maintain the level of water quality to support those
uses in all streams, and to protect and maintain water quality in
special protection streams.