It is hereby found that uncontrolled stormwater
runoff and flooding endanger life and damage public and private property,
that this condition is aggravated by encroachments in the floodplain
which contribute to flooding conditions by decreasing flood storage
volumes, and that the most appropriate method of alleviating flooding
conditions is through the regulation of both stormwater management
and stream encroachments, and that such regulations are within the
exercise of the police power of the Township for the protection of
the persons and property of its inhabitants and for the preservation
of the health, safety and general welfare.
Any application for development in the Township
shall include sufficient information to carry out the intent and purpose
of this article, which shall be administered by the Township Engineer
in conjunction with approval by the Board. Special attention shall
be given to proper sites for stormwater detention and surface drainage
and groundwater recharge so that the surface water will not adversely
affect neighboring properties or the public storm drainage system.
In the preparation of a stormwater management
plan, the following general principals shall be adhered to:
A. Stormwater management systems shall emphasize a natural,
as opposed to an engineered, drainage strategy. The extent of natural
approach depends on such factors as site storage capacity, open channel
hydraulic capacity, recharge capability and maintenance needs and
resources. The extent of the stormwater management design shall be
assessed through the use of the New Jersey Department of Environmental
Protection (NJDEP) "New Jersey Nonstructural Stormwater Management
Strategies Point System" (NSPS) or such other analysis technique suitable
to the municipal approving authority.
B. Maximum use shall be made of presently existing stormwater
runoff control devices, mechanisms or areas, such as existing berms,
terraces, grass waterways, favorable hydrologic soils, swamps, swales,
watercourses, woodlands and floodplains, as well as any proposed management
structures.
C. Whenever practicable, planned or cluster development
shall be employed and permitted if it will reduce the total area of
impervious surfaces and preserve open space and topographic features
critical to stormwater management.
D. Evaluation shall be made of the nature of the subwatershed
of which the site is a part and of the receiving stream channel capacities.
E. Stormwater runoff shall not be transferred from one
subwatershed to another.
F. The plan should coordinate with the soil erosion sediment
control plan.
G. To the greatest possible extent, the plan shall avoid
the concentration of flow and shall provide for dissipation of velocities
at all concentrated discharge points.
H. Reestablishing vegetative cover shall be in accordance
with the Standards and Specifications for Soil Erosion and Sediment
Control in New Jersey, latest edition.
I. Timing for the plan shall establish permanent stormwater
management measures prior to construction or other land disturbance,
to include seeding and establishing sod in grass waterways.
No structure shall be built on a lot, any side
of which fronts on a natural watercourse unless a permit or certificate
of exemption has been issued by the New Jersey Department of Environmental
Protection or as appropriate by the Township of Mansfield, as follows:
A. As required by the Water Supply Management Act N.J.S.A.
58:1A-1 et seq., and the Flood Hazard Area Control Act, N.J.S.A. 58:16A-50
et seq.;
B. As required by N.J.A.C. 7:8-5.5(h), special water
resource protection areas, also known as Category One waters; and
C. As required by §
363-15, Riparian buffer conservation zone.