[Added 12-7-2020 by Ord.
No. 2020-39]
The stormwater runoff requirements applicable to small projects
(as defined in section 10B-241 of this article) are as follows:
(a)
For each square foot of new impervious surface, two gallons
of stormwater shall be managed on site using green infrastructure
practices. Of that volume 0.78 gallons (equivalent to the water quality
design storm of 1.25 inches) must be retained on site, while the remainder
may be discharged offsite from the stormwater management measure.
The green infrastructure practices are those listed below and shall
be designed and implemented as required by the Princeton Stormwater
Management Ordinance. The use of cisterns and drywells is allowed
only where the other listed methods cannot meet the requirements of
this subsection 10B-331.1(a).
(b)
To the extent the required volumes from subsection 10B-331.1(a)
cannot be entirely managed or retained on site through the green infrastructure
BMPs listed above, the municipal engineer may allow the use of other
stormwater management measures, with preference given to other green
infrastructure BMPs that are allowed under N.J.A.C. 7:8, the Municipal
Stormwater Management Rules.
(c)
All development applications subject to this section shall be
reviewed by the municipal engineer to confirm that all stormwater
runoff created by the proposed development is adequately controlled
and does not cause a material adverse impact on adjoining property,
such as but not limited to flooding of a basement or the land surface,
concentrated flows outside of natural stream channels, and disturbance
of off-site stormwater management measures. For any stormwater management
practice that involves infiltration or a subsurface component, the
applicant shall provide information regarding the depth to seasonal
high water table. For infiltration practices, the applicant shall
provide the soil permeability, the designed infiltration rates of
each relevant stormwater management techniques, and groundwater mounding
calculations in accordance with the BMP Manual.
(d)
Where the discharge from the stormwater management measure cannot
reasonably be designed to avoid causing a material adverse impact
on adjoining property as described in subsection 10B-331.1(c) above,
the discharge shall be directed to a storm sewer, gutter, swale, or
other suitable stormwater runoff conveyance measure that avoids such
impacts.
(e)
If the municipal engineer determines that the discharge from
the stormwater management measure cannot be designed to meet the requirements
of subsection 10B-331.1(c) or (d) above, the stormwater discharge
from the site shall be reduced to a safe and non-harmful level through
on-site retention using green infrastructure practices, or to the
extent that green infrastructure practices are technically impracticable,
such other measures (including but not limited to gray stormwater
infrastructure) as may be required by the municipal engineer.
(f)
The terms, phrases, words and their derivations as used in this
division shall have the meanings stated in section 10B-227.1 of the
Princeton Stormwater Management Ordinance, unless their use in the
context of this division clearly demonstrates a different meaning.
[Added 12-7-2020 by Ord.
No. 2020-39]
Design standards for the green infrastructure practices and
stormwater management measures shall be the same as for major development
in the Princeton Stormwater Management Ordinance, as set forth in
section 10B-227.3, except for subsections 10B-227.3(d), (e), (r),
(s) and (t) (which subsections shall not apply to small projects).
[Added 12-7-2020 by Ord.
No. 2020-39]
Plans for stormwater management measure maintenance shall be
prepared in accordance with the Princeton Stormwater Management Ordinance,
as set forth in section 10B-227.9.
[Added 12-7-2020 by Ord.
No. 2020-39]
All green infrastructure measures and stormwater management
measures as required in this division shall be reflected in a deed
notice containing a description of the green infrastructure facility
and stormwater management measure(s) used, in a form approved by the
municipal attorney and recorded in the Mercer County Clerk's Office.
Proof that the required deed notice has been filed shall be submitted
to the municipal engineer prior to issuance of certificate of occupancy
or final inspection.
[Added 12-7-2020 by Ord.
No. 2020-39]
[Added 12-7-2020 by Ord.
No. 2020-39]
The stormwater management standards and requirements for "Major
Development," as set forth in the Princeton Stormwater Management
Ordinance, shall be applicable to large projects.
[Added 12-7-2020 by Ord.
No. 2020-39]
Any person(s) who erects, constructs, alters, repairs, converts,
maintains, or uses any building, structure or land in violation of
this division, or otherwise violates this division, shall be subject
to the penalties set forth in section 10B-107 of this chapter.
