[Ord. #585, § 511A; Ord. #1103,
§ 25]
a. All development applications shall include drainage
facilities capable of providing for stormwater as described below.
b. No development application shall be approved which
causes an increase in the rate of discharge from the property as determined
for a one-hundred-year storm with a twenty-four-hour duration except
as provided herein.
c. The system shall be adequate to carry off or store
the stormwater and natural drainage which originates not only within
the lot or tract boundaries, but also that which originates beyond
the lot or tract boundaries and traverses the site. No stormwater
runoff or natural drainage shall be diverted so as to overload existing
drainage systems or create flooding or the need for additional drainage
structures on other private properties or public lands without adequate
provision for off-tract improvements to accommodate the condition(s).
Final disposition of stormwater shall be to an existing natural watercourse.
d. As required, approval for drainage structures shall be
obtained from the appropriate municipal, county, state and federal
agencies and offices, or such approval shall be a condition of preliminary
approval. When required, each applicant shall make application to
the Department of Environmental Protection, to the County Engineering
Department and to the Township Engineer. Letters of approval from
the appropriate governmental authorities shall be furnished to the
Board Secretary, with copies to the Township Engineer.
[Ord. #2464, 3-9-2021, amended]
e. All sump pumps, roof leaders and foundation drains
shall be connected to the drainage system, if available.
f. Where a lot or a tract is traversed by a watercourse,
surface or underground drainage system, channel or stream carrying
water from an adjacent tract of land, there shall be provided and
dedicated a drainage right-of-way easement to the Township conforming
substantially with the lines of such watercourse, and such further
width or construction or both as will be adequate to accommodate expected
stormwater runoff in the future, based upon reasonable growth potential
in the Township and, in any event, meeting the minimum widths and
locations shown on an adopted Official Map or element of the Master
Plan for the Township, or where not so shown, having a minimum width
of 20 feet.
g. Detention Facilities. In lieu of on-site detention or retention, the applicant may request to provide an off-tract improvement in accordance with Article
IX of this chapter. If agreed to by the Township, contributions for off-tract improvements shall be used for the study, design and/or construction of an off-tract detention or retention facility necessary to provide for the control of stormwater runoff in the drainage basin within which the proposed development is located.
h. As-built drawings of detention basins are to be certified
by a New Jersey licensed professional engineer to confirm that the
basin(s) have been constructed in accordance with Township standards
and the approved subdivision or site plan.
[Ord. #585, § 511B]
Construction within a floodplain shall be in accordance with Subsection
21-14.3.
[Ord. #585, § 511C]
Storm sewers, open channels, bridges and culverts
shall be designed for minimum flow capacities as follows:
|
Design Capacity
|
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Drainage system*
|
25 years
|
Drainage structures**
|
100 years
|
Open channels
|
As determined by the Township Engineer
|
NOTES:
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*The term "drainage system" refers to the composite
of all drainage infrastructure improvements.
|
** The term "drainage structures" refers to
particular drainage infrastructure improvements such as bridges, culverts,
detention and retention facilities.
|