[Amended 2-20-2008 by Ord. No. 5-2008]
Standards and specifications for measures used
in a lot grading plan as required by this chapter shall be in accordance
with the latest edition of the Standards for Soil Erosion and Sediment
Control in New Jersey, as promulgated by the State Soil Conservation
Committee.
A.
Standards and specifications for measures used in
the lot grading plan shall be in accordance with the latest edition
of the Standards for Soil Erosion and Sediment Control in New Jersey,
as promulgated by the State Soil Conservation Committee.
[Amended 7-7-1977; 2-20-2008 by Ord. No. 5-2008]
B.
For calculating runoff and controls, either of the
following methods may be used in computing runoff: Soil Conservation
Service Method under USDA or the Rational Method.
|
Criteria
|
SCS Method
|
Rational Method
|
|---|---|---|
|
Surface conditions
|
Meadow
|
Average cultivation or light growth R = (0.20
to 0.40)
|
|
Collection system
|
15-year storm (residential)
|
15-year storm (residential)
|
|
25-year storm (business)
|
25-year storm (business)
| |
|
Storage
|
100-year storm
|
100-year storm
|
|
Emergency spillway
|
100-year storm
|
100-year storm
|
|
Soil type
|
A, B, C, D as determined by map (Hydrologic
soils) (title)
|
Loam
|
|
Intensity
|
SCS Method
|
Borough-adopted rainfall curves
|
C.
All outfalls are to be designed in a manner to retard
velocities at the outfall and provide stream channel protection.
D.
Allowance may be made in the application of the design
standards when a natural drainage pattern is necessarily intercepted,
as by a street.
E.
All water-carrying structures and/or retention areas
shall be completed and stabilized prior to diversion of water to them.
F.
As a preliminary to developing the control plan there
shall be an inventory of the site showing all existing natural and
man-made drainage-related features (berms, terraces, grass waterways,
favorable hydrologic soils, poorly drained soils, swamps, swales,
watercourses, woodlands and floodplains). These shall be incorporated
in the plan to the greatest possible extent in accordance with their
functional capability.
G.
Drainageways and watercourses which normally carry
or receive surface water runoff shall not be overloaded with increased
runoff, sediment or other pollution resulting from disturbance of
soil and vegetation or incident to development, construction or other
activity.
H.
Due consideration shall be given to the relationship
of the subject property to the natural or established drainage pattern
of the subwatershed(s) of which it is a part.
I.
Surface water runoff controls shall be designed to
assure that the land in question uses no more than its proportionate
share of the natural stream and culvert capacity.
J.
Curbing requirements may be relaxed by the Borough
Engineer in the interest of acceptable drainage accommodation that
will relieve concentration of flow or discharge to a stormwater sewer
system.
K.
Innovative surface water runoff control and recharge
devices may be proposed, such as rooftop storage, dry wells, cisterns
or roof drain infiltration trenches, provided that they are accompanied
by detailed engineering plans and performance capabilities.
A.
The yards of every structure shall be graded to secure
proper drainage away from buildings and dispose of it without ponding,
and all land within a development shall be graded to drain and dispose
of surface water without ponding except where approved by the Board.
Minimum slopes away from structures of 2% shall be required.
B.
Where practicable, all drainage provisions shall be
of such design so as to collect on-site runoff and carry surface waters
to the nearest storm drain or natural watercourse. Where drainage
swales are used to deliver surface waters away from buildings, the
swales shall be sodded or planted as required and shall be of such
slope, shape and size to conform with specifications of the Borough.
C.
Concentration of diffused natural water flow shall
only be permitted in swales or watercourses.
D.
Excavations and fills:
(1)
No excavation shall be made with a cut face steeper
in slope than 1 1/2 horizontal to one vertical, except as approved
by the Borough Engineer when handled under special conditions.
(2)
No fill shall be placed which creates any exposed
surface steeper in slope than two horizontal to one vertical, except
as approved by the Borough Engineer when handled under special conditions.
(3)
Adequate provisions shall be made to prevent surface
water from damaging the cut face of excavations of the sloping surfaces
of fills.
(4)
Retaining walls or cribbing shall be required where
needed to prevent the surface of excavations or fills from exceeding
at any point the maximum allowable slope.
(5)
Excavations shall not be made so close to property
lines as to endanger adjoining property without supporting and protecting
the face of the excavation.
(6)
No fill shall be made so as to cause settlement, sliding
or erosion of the soil.
(7)
No fill shall be made or placed adjacent to the bank
of a channel so as to create bank failure or sliding.
