[HISTORY: Adopted by the Township Committee of the Township
of Cranford 3-30-2021 by Ord. No. 2021-06.[1] Amendments noted where applicable.]
[1]
Editor's Note: This ordinance also repealed former Ch. 364,
Stormwater Management, adopted 12-16-2014 by Ord. No. 2014-25 (Ch. 136, Art. VI,
of the 1992 Code).
A.Â
Policy statement. Flood control, groundwater recharge, and pollutant
reduction through nonstructural or low-impact techniques shall be
explored before relying on structural best management practices (BMPs).
Structural BMPs should be integrated with nonstructural stormwater
management strategies and proper maintenance plans. Nonstructural
strategies include both environmentally sensitive site design and
source controls that prevent pollutants from being placed on the site
or from being exposed to stormwater. Source control plans should be
developed by a professional engineer licensed in the State of New
Jersey. These plans will be based upon physical site conditions and
the origin, nature, and the anticipated quantity or amount of potential
pollutants. Multiple stormwater management BMPs may be necessary to
achieve the established performance standards for water quality, quantity,
and groundwater recharge.
B.Â
Purpose and objectives. It is the purpose of this chapter to promote
the public health, safety and general welfare and to minimize public
and private losses due to flood conditions in specific areas of the
Township of Cranford by:
(1)Â
Protecting human life and health.
(2)Â
Minimizing expenditure of public money for costly flood-control projects.
(3)Â
Minimizing the need for rescue and relief efforts associated with
flooding and generally undertaken at the expense of the general public.
(4)Â
Minimizing prolonged business interruptions.
(5)Â
Minimizing damage to public facilities and utilities such as water
and gas mains, electric, telephone and sewer lines, streets, and bridges
located in floodplains.
(6)Â
Maintaining a stable tax base by providing for the sound use and
development of flood-prone areas in such a manner as to minimize future
damages from flood.
(7)Â
Ensuring that potential property purchasers are notified that property
is in a flood-prone area.
(8)Â
Promoting water quality for rivers and streams.
C.Â
Findings of fact. The Township Committee of the Township of Cranford
finds that:
(1)Â
The flood hazard areas of the Township of Cranford are subject to
periodic inundation which could result in loss of life or property,
affect health and produce safety hazards, disrupt commerce and governmental
services or result in extraordinary public expenditures and impairment
of the tax base, all of which adversely affect the public health,
safety and general welfare.
(2)Â
These flood losses are caused by the cumulative effect of obstructions
in floodplains causing increases in flood heights and velocities and
by the occupancy in flood hazard areas by uses vulnerable to floods
or uses hazardous to other lands which are inadequately protected
from flood damage.
(3)Â
These flood losses are also caused by the cumulative effect of increases
in impervious cover by construction of structures, such as new homes,
buildings, building additions, roadways, driveways, patios, and other
materials that disallow water to pass through soils into the groundwater,
or to be stored in plant life and soils.
(4)Â
By not controlling stormwater runoff, soil erosion, loss of groundwater
recharge, and pollution reduction through structural BMPs and nonstructural
or low-impact techniques that reduce or prevent pollutants from being
placed on the sites or from being exposed to stormwater, the streams
and rivers in the Township of Cranford will become more polluted,
will lose natural plant and aquatic life, and will eventually reduce
the natural beauty and charm of the Township's streams and rivers.
D.Â
Applicability. This chapter shall be applicable to all development
plans, building additions, driveway widening, new patios, pools, garages,
sheds, and any residential projects that are below the threshold of
major developments, if they are neither a site plan nor subdivision
and increase impervious cover greater than 300 square feet but less
than 1,000 square feet.
E.Â
Compatibility with other permit and ordinance requirements. Development
approvals issued for subdivisions and site plans pursuant to this
chapter are to be considered an integral part of development approvals
under the subdivision and site plan review process and do not relieve
the applicant of the responsibility to secure required permits or
approvals for activities regulated by any other applicable code, rule,
act or ordinance.
For the purpose of this chapter, the following terms, phrases,
words and their derivations shall have the meanings stated herein
unless their use in the text of this chapter clearly demonstrates
a different meaning. When not inconsistent with the context, words
used in the present tense include the future, words used in the plural
number include the singular number, and words used in the singular
number include the plural number. The word "shall" is always mandatory
and not merely directory. The definitions below are the same as or
based on the corresponding definitions in the Stormwater Management
Rules at N.J.A.C. 7:8-1.2.
Those areas with boundaries incorporated by reference or
revised by the Department in accordance with N.J.A.C. 7:7-13.16.
The map used by the Department to identify the location of
Coastal Planning Areas, CAFRA centers, CAFRA cores, and CAFRA nodes.
The CAFRA Planning Map is available on the Department's Geographic
Information System (GIS).
An infiltration system, sand filter designed to infiltrate,
standard constructed wetland, or wet pond, established in accordance
with N.J.A.C. 7:8-4.2(c)14, that is designed and constructed in accordance
with the New Jersey Stormwater Best Management Practices Manual, or
an alternate design, approved in accordance with N.J.A.C. 7:8-5.2(g),
for an infiltration system, sand filter designed to infiltrate, standard
constructed wetland, or wet pond and that complies with the requirements
of this chapter.
The increase in soil bulk density.
The area from which stormwater runoff drains to a stormwater
management measure, not including the area of the stormwater management
measure itself.
A pedestrian-oriented area of commercial and civic uses serving
the surrounding municipality, generally including housing and access
to public transportation.
An agency designated by the County Commissioners to review
municipal stormwater management plans and implementing ordinance(s).
The county review agency may either be:
The Department of Environmental Protection.
A person professionally qualified and duly licensed in New
Jersey to perform engineering services that may include, but not necessarily
be limited to, development of project requirements, creation and development
of project design and preparation of drawings and specifications.
A State Development and Redevelopment Plan Center as designated
by the State Planning Commission such as urban, regional, town, village,
or hamlet.
The division of a parcel of land into two or more parcels,
the construction, reconstruction, conversion, structural alteration,
relocation or enlargement of any building or structure, any mining
excavation or landfill, and any use or change in the use of any building
or other structure, or land or extension of use of land, for which
permission is required under the Municipal Land Use Law, N.J.S.A.
40:55D-1 et seq. In the case of development of agricultural land,
development means: any activity that requires a state permit, any
activity reviewed by the County Agricultural Board (CAB) and the State
Agricultural Development Committee (SADC), and municipal review of
any activity not exempted by the Right to Farm Act, N.J.S.A. 4:1C-1
et seq.
The placement or reconstruction of impervious surface or
motor vehicle surface, or exposure and/or movement of soil or bedrock
or clearing, cutting, or removing of vegetation. Milling and repaving
is not considered disturbance for the purposes of this definition.
A geographic area within which stormwater, sediments, or
dissolved materials drain to a particular receiving water body or
to a particular point along a receiving water body.
Neighborhoods designated by the Urban Coordinating Council
"in consultation and in conjunction with" the New Jersey Redevelopment
Authority pursuant to N.J.S.A. 55:19-69.
The following areas where the physical alteration of the
land is in some way restricted, either through regulation, easement,
deed restriction or ownership, such as wetlands, floodplains, threatened
and endangered species sites or designated habitats, and parks and
preserves. Habitats of endangered or threatened species are identified
using the Department's Landscape Project as approved by the Department's
Endangered and Nongame Species Program.
An area or feature which is of significant environmental
value, including, but not limited to, stream corridors, natural heritage
priority sites, habitats of endangered or threatened species, large
areas of contiguous open space or upland forest, steep slopes, and
wellhead protection and groundwater recharge areas. Habitats of endangered
or threatened species are identified using the Department's Landscape
Project as approved by the Department's Endangered and Nongame
Species Program.
The detachment and movement of soil or rock fragments by
water, wind, ice, or gravity.
A stormwater management measure that manages stormwater close
to its source by:
An area within which water drains to a particular receiving
surface water body, also known as a subwatershed, which is identified
by a fourteen-digit hydrologic unit boundary designation, delineated
within New Jersey by the United States Geological Survey.
A surface that has been covered with a layer of material
so that it is highly resistant to infiltration by water.
The process by which water seeps into the soil from precipitation.
One or more public entities having stormwater management
planning authority designated by the regional stormwater management
planning committee pursuant to N.J.A.C. 7:8-3.2, that serves as the
primary representative of the committee.
An individual development, as well as multiple developments
that individually or collectively result in:
Major development includes all developments that are part of a common plan of development or sale (for example, phased residential development) that collectively or individually meet any one or more of Subsection A(1), (2), (3), or (4) above. Projects undertaken by any government agency that otherwise meet the definition of "major development" but which do not require approval under the Municipal Land Use Law, N.J.S.A. 40:55D-1 et seq., are also considered "major development."
Land vehicles propelled other than by muscular power, such
as automobiles, motorcycles, autocycles, and low-speed vehicles. For
the purposes of this definition, "motor vehicle" does not include
farm equipment, snowmobiles, all-terrain vehicles, motorized wheelchairs,
go-carts, gas buggies, golf carts, ski-slope grooming machines, or
vehicles that run only on rails or tracks.
Any pervious or impervious surface that is intended to be
used by motor vehicles and/or aircraft, and is directly exposed to
precipitation including, but not limited to, driveways, parking areas,
parking garages, roads, racetracks, and runways.
Any city, borough, town, Township, or village.
The manual maintained by the Department providing, in part, design specifications, removal rates, calculation methods, and soil testing procedures approved by the Department as being capable of contributing to the achievement of the stormwater management standards specified in this chapter. The BMP Manual is periodically amended by the Department as necessary to provide design specifications on additional best management practices and new information on already included practices reflecting the best available current information regarding the particular practice and the Department's determination as to the ability of that best management practice to contribute to compliance with the standards contained in this chapter. Alternative stormwater management measures, removal rates, or calculation methods may be utilized, subject to any limitations specified in this chapter, provided the design engineer demonstrates to the municipality, in accordance with § 365-4F and N.J.A.C. 7:8-5.2(g), that the proposed measure and its design will contribute to achievement of the design and performance standards established by this chapter.
An area designated by the State Planning Commission concentrating
facilities and activities which are not organized in a compact form.
A chemical element or compound, such as nitrogen or phosphorus,
which is essential to and promotes the development of organisms.
Any individual, corporation, company, partnership, firm,
association, political subdivision of this state and any state, interstate
or federal agency.
Any dredged spoil, solid waste, incinerator residue, filter
backwash, sewage, garbage, refuse, oil, grease, sewage sludge, munitions,
chemical wastes, biological materials, medical wastes, radioactive
substance [except those regulated under the Atomic Energy Act of 1954,
as amended (42 U.S.C. §§ 2011 et seq.)], thermal waste,
wrecked or discarded equipment, rock, sand, cellar dirt, industrial,
municipal, agricultural, and construction waste or runoff, or other
residue discharged directly or indirectly to the land, groundwaters
or surface waters of the state, or to a domestic treatment works.
"Pollutant" includes both hazardous and nonhazardous pollutants.
The amount of water from precipitation that infiltrates into
the ground and is not evapotranspired.
Any of the following, alone or in combination:
A net increase of impervious surface;
The total area of impervious surface collected by a new stormwater
conveyance system (for the purpose of this definition, a "new stormwater
conveyance system" is a stormwater conveyance system that is constructed
where one did not exist immediately prior to its construction or an
existing system for which a new discharge location is created);
The total area of impervious surface proposed to be newly collected
by an existing stormwater conveyance system; and/or
The total area of impervious surface collected by an existing
stormwater conveyance system where the capacity of that conveyance
system is increased.
Any of the following, alone or in combination:
The total area of motor vehicle surface that is currently receiving
water;
A net increase in motor vehicle surface; and/or quality treatment
either by vegetation or soil, by an existing stormwater management
measure, or by treatment at a wastewater treatment plant, where the
water quality treatment will be modified or removed.
Solid material, mineral or organic, that is in suspension,
is being transported, or has been moved from its site of origin by
air, water or gravity as a product of erosion.
The lot or lots upon which a major development is to occur
or has occurred.
All unconsolidated mineral and organic material of any origin.
An area delineated on the State Plan Policy Map and adopted
by the State Planning Commission that is intended to be the focus
for much of the state's future redevelopment and revitalization
efforts.
The geographic application of the State Development and Redevelopment
Plan's goals and statewide policies, and the Official Map of
these goals and policies.
Water resulting from precipitation (including rain and snow)
that runs off the land's surface, is transmitted to the subsurface,
or is captured by separate storm sewers or other sewage or drainage
facilities, or conveyed by snow removal equipment.
An excavation or embankment and related areas designed to
retain stormwater runoff. A stormwater management BMP may either be
normally dry (that is, a detention basin or infiltration system),
retain water in a permanent pool (a retention basin), or be planted
mainly with wetland vegetation (most constructed stormwater wetlands).
Any practice, technology, process, program, or other method
intended to control or reduce stormwater runoff and associated pollutants,
or to induce or control the infiltration or groundwater recharge of
stormwater or to eliminate illicit or illegal non-stormwater discharges
into stormwater conveyances.
A public body authorized by legislation to prepare stormwater
management plans.
The geographic area for which a stormwater management planning
agency is authorized to prepare stormwater management plans, or a
specific portion of that area identified in a stormwater management
plan prepared by that agency.
Water flow on the surface of the ground or in storm sewers,
resulting from precipitation.
A flood hazard area in which the flood elevation resulting
from the two-, ten-, or 100-year storm, as applicable, is governed
by tidal flooding from the Atlantic Ocean. Flooding in a tidal flood
hazard area may be contributed to, or influenced by, stormwater runoff
from inland areas, but the depth of flooding generated by the tidal
rise and fall of the Atlantic Ocean is greater than flooding from
any fluvial sources. In some situations, depending upon the extent
of the storm surge from a particular storm event, a flood hazard area
may be tidal in the 100-year storm, but fluvial in more frequent storm
events.
A neighborhood given priority access to state resources through
the New Jersey Redevelopment Authority.
A zone designated by the New Jersey Enterprise Zone Authority
pursuant to the New Jersey Urban Enterprise Zones Act, N.J.S.A. 52:27H-60
et seq.
Previously developed portions of areas:
A structure within, or adjacent to, a water, which intentionally
or coincidentally alters the hydraulic capacity, the flood elevation
resulting from the two-, ten-, or 100-year storm, flood hazard area
limit, and/or floodway limit of the water. Examples of a water control
structure may include a bridge, culvert, dam, embankment, ford (if
above grade), retaining wall, and weir.
The ocean and its estuaries, all springs, streams, wetlands,
and bodies of surface or groundwater, whether natural or artificial,
within the boundaries of the State of New Jersey or subject to its
jurisdiction.
An area that is inundated or saturated by surface water or
ground water at a frequency and duration sufficient to support, and
that under normal circumstances does support, a prevalence of vegetation
typically adapted for life in saturated soil conditions, commonly
known as hydrophytic vegetation.
B.Â
Any residential development that increases impervious cover by 300 square feet but is less than 1,000 square feet shall submit a minor site development stormwater plan pursuant to § 364-6B and shall meet all other applicable requirements of this chapter.
C.Â
Runoff standards. The following standards shall apply to all development
in the Township:
(1)Â
The rate of stormwater runoff from the site is not increased as a
result of the development proposed in the application.
(2)Â
The volume of stormwater runoff shall be minimized.
(3)Â
The drainage of the adjacent areas is not adversely affected.
(4)Â
Soil absorption and groundwater recharge capacity of the area is
not decreased below what occurs there under existing conditions.
(5)Â
The natural drainage pattern of the area is not significantly altered.
D.Â
Nonstructural stormwater management strategies.
(1)Â
To the maximum extent practicable, the standards in Subsections G and H shall be met by incorporating nonstructural stormwater management strategies set forth in this subsection into the design. The applicant shall identify the nonstructural measures incorporated into the design of the project. If the applicant contends that it is not feasible for engineering, environmental, or safety reasons to incorporate any nonstructural stormwater management measures identified in Subsection D(2) below into the design of a particular project, the applicant shall identify the strategy considered and provide basis for the contention.
(2)Â
Nonstructural stormwater management strategies incorporated into
the site design shall:
(a)Â
Protect areas that provide water quality benefits or areas particularly
susceptible to erosion and sediment loss.
(b)Â
Minimize impervious surfaces and break up or disconnect the
flow of runoff over impervious surfaces.
(c)Â
Maximize the protection of natural drainage features and vegetation.
(d)Â
Minimize the decrease in the time of concentration from pre-construction
to post-construction. "Time of concentration" is defined as the time
it takes for runoff to travel from the hydraulically most distant
point of the watershed to the point of interest within a watershed.
(e)Â
Minimize land disturbance, including clearing and grading.
(f)Â
Minimize soil compaction.
(g)Â
Provide low-maintenance landscaping that encourages retention
and planting of native vegetation and minimizes the use of lawns,
fertilizers and pesticides.
(h)Â
Provide vegetated open-channel conveyance systems discharging
into and through stable vegetated areas.
A.Â
Stormwater runoff shall be calculated in accordance with the following:
(1)Â
The design engineer shall calculate runoff using one of the following
methods:
(a)Â
For residential site improvements with a proposed impervious cover increase of 1,000 square feet or less, the required storage volume may be taken from the chart titled "Volume of Required Storage vs. Difference in Impervious Cover" found in § 364-5C. These residential improvements will only have to provide on-site stormwater storage in the form of stone landscape beds, wetland ponds, seepage pits, underground stormwater storage chambers, or other BMP measures that will retain the stormwater runoff volume, as taken from this chart, and recharge that volume back into the ground or release it at a preimprovement runoff rate. This stormwater design process does not have to be designed by a professional engineer. An architect, landscape architect, or other individual, upon approval of the Township Engineer, could prepare it. This design process shall include the checklist requirements found under § 364-10B. Any nonresidential development still requires BMPs in accordance with this chapter.
(b)Â
The USDA Natural Resources Conservation Service (NRCS) methodology,
including the NRCS Runoff Equation and Dimensionless Unit Hydrograph,
as described in the NRCS National Engineering Handbook, Section 4,
Hydrology, and Technical Release 55, Urban Hydrology for Small Watersheds;
or
(c)Â
The Rational Method for peak flow and the Modified Rational
Method for hydrograph computations.
(2)Â
For the purpose of calculating runoff coefficients and groundwater recharge, there is a presumption that the pre-construction condition of a site or portion thereof is a wooded land use with good hydrologic condition. The term "runoff coefficient" applies to both the NRCS methodology at Subsection A(1)(a) and the Rational and Modified Rational Methods at Subsection A(1)(b). A runoff coefficient or a groundwater recharge land cover for an existing condition may be used on all or a portion of the site if the design engineer verifies that the hydrologic condition has existed on the site or portion of the site for at least five years without interruption prior to the time of application. If more than one land cover has existed on the site during the five years immediately prior to the time of application, the land cover with the lowest runoff potential shall be used for the computations. In addition, there is the presumption that the site is in good hydrologic condition (if the land use type is pasture, lawn, or park), with good cover (if the land use type is woods), or with good hydrologic condition and conservation treatment (if the land use type is cultivation).
(3)Â
In computing pre-construction stormwater runoff, the design engineer
shall account for all significant land features and structures, such
as ponds, wetlands, depressions, hedgerows, or culverts, that may
reduce pre-construction stormwater runoff rates and volumes.
(4)Â
In computing stormwater runoff from all design storms, the design
engineer shall consider the relative stormwater runoff rates and/or
volumes of pervious and impervious surfaces separately to accurately
compute the rates and volume of stormwater runoff from the site. To
calculate runoff from unconnected impervious cover, urban impervious
area modifications as described in the NRCS Technical Release 55,
Urban Hydrology for Small Watersheds, and other methods may be employed.
(5)Â
If the invert of the outlet structure of a stormwater management
measure is below the flood hazard design flood elevation as defined
at N.J.A.C. 7:13, the design engineer shall take into account the
effects of tail water in the design of structural stormwater management
measures.
(6)Â
The rainfall excess shall be computed for each site using accepted,
published runoff coefficients which reflect land use and topography.
Acceptable runoff coefficients currently in practice include, but
are not limited to, the following:
|
Surface Type
|
Runoff Coefficient
|
|---|---|
|
Streets
| |
|
Asphaltic
|
0.70 to 0.95
|
|
Concrete
|
0.80 to 0.95
|
|
Brick
|
0.70 to 0.85
|
|
Drives and walks
|
0.75 to 0.85
|
|
Roofs
|
0.75 to 0.95
|
|
Lawns, sandy soil
| |
|
Flat, 2%
|
0.05 to 0.10
|
|
Average, 2% to 7%
|
0.10 to 0.15
|
|
Steep, 7%
|
0.15 to 0.20
|
|
Lawns, heavy soil
| |
|
Flat, 2%
|
0.13 to 0.17
|
|
Average, 2% to 7%
|
0.18 to 0.22
|
|
Steep, 7%
|
0.25 to 0.35
|
A.Â
Technical guidance for stormwater management measures can be found in the documents listed at Subsection A(1) and (2) below, which are available from Maps and Publications, New Jersey Department of Environmental Protection, 428 East State Street, P.O. Box 420, Trenton, New Jersey 08625; telephone (609) 777-1038.
(1)Â
Guidelines for stormwater management measures are contained in the
New Jersey Stormwater Best Management Practices Manual, as amended.
Information is provided on stormwater management measures, such as
bioretention systems, constructed stormwater wetlands, dry wells,
extended detention basins, infiltration structures, manufactured treatment
devices, pervious paving, sand filters, vegetative filter strips,
and wet ponds.
(2)Â
The New Jersey Department of Environmental Protection Stormwater
Management Facilities Maintenance Manual, as amended.
B.Â
Additional technical guidance for stormwater management measures
can be obtained from the following:
(1)Â
The Standards for Soil Erosion and Sediment Control in New Jersey
promulgated by the State Soil Conservation Committee and incorporated
into N.J.A.C. 2:90. Copies of these standards may be obtained by contacting
the State Soil Conservation Committee or any of the Soil Conservation
Districts listed in N.J.A.C. 2:90-1.3(a)3. The location, address,
and telephone number of each Soil Conservation District may be obtained
from the State Soil Conservation Committee, P.O. Box 330, Trenton,
New Jersey 08625, (609) 292-5540;
(2)Â
The Rutgers Cooperative Extension Service, (732) 932-9306; and
(3)Â
The Soil Conservation Districts listed in N.J.A.C. 2:90-1.3(a)3.
The location, address, and telephone number of each Soil Conservation
District may be obtained from the State Soil Conservation Committee,
P.O. Box 330, Trenton, New Jersey, 08625, (609) 292-5540.
C.Â
Use of the following "Volume of Required Storage vs. Difference in Impervious Cover" chart for change in impervious cover that is 1,000 square feet or less for residential development only. Nonresidential site plans and developments defined as major development still require BMPs as addressed in Chapter 365.
 |
A.Â
Submission of site development stormwater plan. A site development
stormwater plan is not required for residential improvements or residential
developments that have 1,000 square feet or less change of impervious
cover.
B.Â
Submission of minor site development stormwater plan.
(1)Â
Whenever an applicant seeks municipal approval of a development subject to this chapter, the applicant shall submit all of the required components of the checklist for the minor site development stormwater plan of Subsection B(5) found below as part of the submission of the applicant's application for subdivision or site plan or construction or zoning permit approval.
(2)Â
The applicant shall demonstrate that the project meets the standards
set forth in this chapter.
(3)Â
The applicant shall submit six copies of the materials listed in the checklist for minor site development stormwater plans in accordance with Subsection B(5) of this section.
(4)Â
Minor site development stormwater plan approval. The applicant's
minor site development project shall be reviewed as a part of the
subdivision, site plan and/or construction or zoning permit review
process by the municipal board or official from whom municipal approval
is sought. That municipal board or official shall consult the Township
Engineer to determine if all of the checklist requirements have been
satisfied and to determine if the project meets the standards set
forth in this chapter.
(5)Â
Checklist requirements. The following information shall be required:
(a)Â
Copy of current existing property survey, to scale, showing
all existing impervious features, such as dwellings, garages, sheds,
driveways, patios, steps, and porches. Each of these items shall have
a description of their material makeup, i.e., pitched slate roof,
asphalt driveway, concrete steps, etc.
(c)Â
Calculations of change in impervious cover:
[1]Â
Existing impervious cover within the property boundary limits,
described in square feet.
[2]Â
Proposed impervious cover within the property boundary limits,
including the remaining existing impervious cover, described in square
feet.
[3]Â
The difference in impervious cover, which is the difference between the proposed impervious cover found in Subsection B(5)(c)[2] above and the existing impervious cover found in Subsection B(5)(c)[1] above.
[4]Â
Calculations of the volume of required storage. This information would be taken by using the difference in impervious cover, as found in Subsection B(5)(c)[3] above, and finding this number on the left side of the Volume of Required Storage vs. Difference in Impervious Cover graph found in § 364-5C. Using this chart, follow the horizontal line closest to this number across until it meets the diagonal line. At this point on the diagonal line, follow the matching vertical line down to the bottom of the chart until it gets to the reading of the volume in cubic feet. Each vertical line is broken up into twenty-five-cubic-foot segments. If your numbers do not fall on a specific line, then you must interpolate the answer.
[5]Â
Design a stormwater detention or retention structure based on this volume found in Subsection B(5)(c)[4] above. The Township Engineer will assist you in the design options and methods of calculating a structure's volume for stone or seepage pit chambers, if you request. All other designs must be supported by the manufacturer, engineer, architect, or landscape architect. Each design must contain a sketch with enough dimensions on it to be able to calculate the volume of storage provided by the structure and describe the material that the structure is made out of, and all designs shall have an overflow capability that will not back water up into any basements, dwellings or adjoining properties.
B.Â
General maintenance.
(1)Â
The design engineer shall prepare a maintenance plan for the stormwater
management measures incorporated into the design of a major development.
(2)Â
The maintenance plan shall contain specific preventative maintenance
tasks and schedules; cost estimates, including estimated cost of sediment,
debris, or trash removal; and the name, address, and telephone number
of the person or persons responsible for preventative and corrective
maintenance (including replacement). Maintenance guidelines for stormwater
management measures are available in the New Jersey Stormwater Best
Management Practices Manual. If the maintenance plan identifies a
person other than the developer (for example, a public agency or homeowners'
association) as having the responsibility for maintenance, the plan
shall include documentation of such person's agreement to assume
this responsibility or of the developer's obligation to dedicate
a stormwater management facility to such person under an applicable
ordinance or regulation.
(3)Â
Responsibility for maintenance shall not be assigned or transferred
to the owner or tenant of an individual property in a residential
development or project, unless such owner or tenant owns or leases
the entire residential development or project.
(4)Â
If the person responsible for maintenance identified under Subsection B(2) above is not a public agency, the maintenance plan and any future revisions based on Subsection B(7) below shall be recorded upon the deed of record for each property on which the maintenance described in the maintenance plan must be undertaken.
(5)Â
Preventative and corrective maintenance shall be performed to maintain
the function of the stormwater management measure, including repairs
or replacement to the structure; removal of sediment, debris, or trash;
restoration of eroded areas; snow and ice removal; fence repair or
replacement; restoration of vegetation; and repair or replacement
of nonvegetated linings.
(6)Â
The person responsible for maintenance identified under Subsection B(2) above shall maintain a detailed log of all preventative and corrective maintenance for the structural stormwater management measures incorporated into the design of the development, including a record of all inspections and copies of all maintenance-related work orders.
(7)Â
The person responsible for maintenance identified under Subsection B(2) above shall evaluate the effectiveness of the maintenance plan at least once per year and adjust the plan and the deed as needed.
(8)Â
The person responsible for maintenance identified under Subsection B(2) above shall retain and make available, upon request by any public entity with administrative, health, environmental, or safety authority over the site, the maintenance plan and the documentation required by Subsection B(6) and (7) above.
(10)Â
In the event that the stormwater management facility becomes
a danger to public safety or public health, or if it is in need of
maintenance or repair, the municipality shall so notify the responsible
person in writing. Upon receipt of that notice, the responsible person
shall have 14 days to effect maintenance and repair of the facility
in a manner that is approved by the Municipal Engineer or his designee.
The municipality, in its discretion, may extend the time allowed for
effecting maintenance and repair for good cause. If the responsible
person fails or refuses to perform such maintenance and repair, the
municipality or county may immediately proceed to do so and shall
bill the cost thereof to the responsible person.
C.Â
Nothing in this section shall preclude the municipality in which
the major development is located from requiring the posting of a performance
or maintenance guarantee in accordance with N.J.S.A. 40:55D-53.
Any person who erects, constructs, alters, repairs, converts,
maintains, or uses any building, structure or land in violation of
this chapter shall be subject to penalties. Unless otherwise specifically
provided herein, any violation of the provisions of this chapter shall
be punishable by a fine not to exceed $1,000 or by imprisonment in
the county jail for a term not to exceed 90 days, or both, at the
discretion of the Municipal Court. Each day that the violation continues
after a notice of violation and a reasonable opportunity to correct
or remedy the violation shall constitute a separate violation.
A.Â
This chapter is not intended to repeal, abrogate or impair any existing
easements, covenants, or deed restrictions. However, where this chapter
and an easement, covenant or deed restriction conflict or overlap,
whichever imposes the more stringent restrictions shall prevail.
B.Â
This chapter is not intended to interfere with, abrogate, or annul
any other ordinance, rule or regulation, statute, or other provision
of law, except that, where any provision of this chapter imposes restrictions
different from those imposed by any other ordinance, rule or regulation,
statute, or other provision of law, the more restrictive provisions
or higher standards shall control.
In the interpretation and application of this chapter, all provisions
shall be:
The degree of flooding protection required by this chapter is
considered reasonable for regulatory purposes and is based on scientific
and engineering considerations. Larger floods can and will occur on
rare occasions. Flood heights may be increased by man-made or natural
causes. This chapter does not imply that land outside the areas of
special flood hazard or uses permitted within such areas will be free
from flooding or flood damages. This chapter shall not create liability
on the part of the Township of Cranford or any officer or employee
thereof for any flood damages that result from reliance on this chapter
or any administrative decision lawfully made thereunder.
