A.
Plat sheet requirements.
(2)
All improvement and utility plans shall be 24 inches
by 36 inches.
(4)
The plats shall all be presented in an orientation
to the reader that is consistent, i.e., the North arrow shall be pointing
in the same direction on each sheet.
[Added 8-1-2006 by Ord. No. 13-28-2006]
(5)
All plats shall contain an appropriate legend on each
sheet identifying the specialized markings utilized on that sheet.
[Added 8-1-2006 by Ord. No. 13-28-2006]
(6)
On all plats, the designation of tax block and tax
lot shall appear with the tax block designation shown first and the
tax lot designation following.
[Added 8-1-2006 by Ord. No. 13-28-2006]
B.
Plat requirements.
(1)
Minor subdivisions. The plat for a minor subdivision
shall include the following:
(a)
Key map showing the subdivision site and its
relation to the surrounding area, streets, and highways and zone district
boundaries and identifying the area streets by name. The key map shall
be presented at a graphic scale equal to the Kingwood Township Tax
Map or Official Map and shall show the following information in a
clear and legible form:
[Amended 8-1-2006 by Ord. No. 13-28-2006]
[1]
The relationship of the property to the primary
and secondary highway system and main intersections;
[2]
Boundary lines, building zone districts, special
districts and municipal areas;
[3]
Map match lines as needed when there are two
or more drawings to show the complete subdivision;
[4]
The plat area being submitted for approval shall
be shaded if it is only one section of the entire subdivision;
[5]
Subdivision boundary line (heavy solid line)
and survey data;
[6]
Boundaries of adjacent properties and property
owners' names; and
[7]
Subdivision streets and blocks to scale.
(b)
Boundary survey data or Tax Map data or some
other similarly accurate base.
(c)
Topographic survey conditions of property and
surrounding area within 200 feet, except that within a developed area
only, structures on the adjoining lots need be shown.
(d)
Existing and proposed drainage features of property
and surrounding area within 200 feet (e.g., culverts, marshes, water
areas, streams and lands subject to occasional flooding).
(e)
Special site conditions (e.g., easements, power
lines and structures).
(f)
The location of that portion which is to be
subdivided in relation to the entire tract.
(g)
Tax sheet, block and lot number, if any.
(h)
The name of the owner and all adjoining property
owners as disclosed by the most recent municipal tax records.
(i)
All existing and proposed streets or roads within
or adjoining the proposed subdivision, with the right-of-way widths
clearly indicated.
(j)
All proposed lot lines and lot lines to be eliminated
by the proposed subdivision shall be clearly indicated.
(k)
All existing, proposed and required setback
dimensions.
(l)
Scale of the plat and North arrow with reference
meridian.
[Amended 8-1-2006 by Ord. No. 13-28-2006]
(m)
Acreage of the entire tract and the area being
subdivided.
(n)
Name and address of owner, subdivider and person
preparing plat.
(o)
Documentation of feasibility of an adequate
method of sewage disposal.
(p)
A narrative explaining the application.
(q)
Except for mergers or boundary adjustments not
creating any new lot, the location and results of soil profile pits
and/or borings and permeability tests for each lot, including the
remaining lands, conducted in accordance with N.J.A.C. 7:9A-1 et seq.,
Standards for Individual Subsurface Sewage Disposal Systems, as amended
or such regulations as may subsequently be substituted for or intended
to replace said regulations, and any requirements of the Kingwood
Township Board of Health. The location and results of all such tests
attempted shall be shown on the plat. All such tests shall be conducted
under the supervision of a licensed professional engineer of the State
of New Jersey and witnessed by a duly appointed official of the Township
of Kingwood. The applicant's or owner's engineer shall certify on
said plat that the tests in question conform to the requirements of
N.J.S.A. 7:9A-1 et seq. for the construction of an individual subsurface
disposal system.
[Added 12-15-1986 by Ord. No. 5-7-86; amended 10-19-1987 by Ord. No. 5-9-87; 9-17-1990 by Ord. No.
7-15-90; 9-5-2006 by Ord. No. 13-31-2006]
(2)
Major subdivisions. The plat for a major subdivision
shall include:
(a)
All the data required for a minor subdivision
plat.
(b)
Contours at an interval of two feet based on
United States Geological Survey datum for the property to be subdivided
and the surrounding area within 200 feet unless otherwise approved
by the Township Engineer.
(c)
Relationship to the comprehensive plan for the
area.
(d)
Proposed street, block and lot layout with reference
to surrounding properties and street pattern.
C.
Plat for preliminary approval, improvement and utility
plans and plat for final approval common requirements. In addition
to the requirements hereafter set forth, the plats and improvement
and utility plans shall conform to the following:
(1)
The drawing shall be prepared by a professional engineer
licensed to practice in New Jersey, except as follows:
(a)
The boundary survey and the plat for final approval
shall be prepared by a land surveyor licensed to practice in New Jersey.
(b)
Architectural drawings shall be prepared by
an architect licensed to practice in New Jersey.
(c)
Landscape drawings, except street tree locations
and types, shall be prepared by a practicing landscape architect or
qualified landscape designer.
(2)
Title block shall include the following information:
(a)
Name of the subdivision.
(b)
Name, address, membership or license of the
professional person who prepared the drawings.
(c)
The term "plat" or "improvement and utility
plans," whichever is applicable.
(d)
Date of the drawing.
(e)
Drawing reference number.
(f)
Section number of the section being subdivided,
if applicable.
(g)
Scale of the drawing.
(4)
The title sheet or plat for final approval shall show
the following additional data:
(5)
In addition to the key map, there shall be a location
map showing the subdivision site and its relation to the surrounding
area, streets, and highways and zone district boundaries and identifying
the area streets by name. The location map shall be presented at a
graphic scale equal to the Kingwood Township Tax Map or Official Map
and shall show the following information in a clear and legible form:
[Amended 8-1-2006 by Ord. No. 13-28-2006]
(a)
Relationship to the primary and secondary highway
system and main intersections.
(b)
Boundary lines, building zone districts, special
districts and municipal areas.
(c)
Subdivision streets and blocks to scale.
(d)
Map match lines as needed when there are two
or more drawings to show the complete subdivision.
(e)
The plat area being submitted for approval shall
be shaded if it is only one section of entire subdivision.
(f)
Subdivision boundary line (heavy solid line)
and survey data.
(g)
Boundaries of adjacent properties and property
owners' names, provided that adjacent properties which are a part
of a recorded subdivision plat may be identified by the subdivision
name.
D.
Plat data for preliminary approval. The plat shall
contain the following additional data:
(1)
Survey data.
(a)
The plat shall be based on a boundary survey
which shall be based on a field traverse having an error of closure
of not less than one part in 10,000 parts.
(b)
Topographic contours at two-foot intervals referred
to the United States Coast and Geodetic Survey datum of mean sea level,
provided that smaller or larger intervals, when advisable due to the
terrain, may be used after approval by the Township Engineer. The
contours shall extend 200 feet beyond the subdivision boundary line.
(2)
Existing site conditions to be indicated.
(d)
Location, size and capacity of other utility
structures, such as water and gas mains and power lines, on the subdivision
and within 500 feet of its boundaries.
(e)
Marshes, ponds, streams and land subject to
periodic or occasional flooding or similar conditions on the subdivision
and within 500 feet of its boundaries.
(f)
Test holes.
[1]
Test holes shall be dug at a rate of one test
hole and two percolation tests per lot of land to be subdivided. Test
holes shall be dug to a depth of 12 feet or bedrock, whichever is
less, for the purpose of determining bedrock elevations, soil horizons
and groundwater depth. The percolation test shall be dug and tested
in accordance with Chapter 199.
[2]
The location of each test hole shall be shown
on the plat with a graphical representation of the depth to bedrock,
soil horizons and groundwater, including elevations of bedrock and
groundwater.
(g)
Township or other public lands, including lands
designated as parks, open spaces or for some other public use.
(h)
Buildings and other structures located on the
subdivision and within 200 feet of its boundaries.
(i)
Trees over four inches in diameter measured
at six feet above existing grade. Where trees are in mass, only the
limits thereof need to be shown.
(3)
Proposed site conditions to be indicated.
(b)
Lot layout.
[1]
Lot lines and dimensions to the nearest foot
and lot area in square feet.
[2]
Building setback lines (dashed) and its dimensions
from the lot line.
[3]
Easements and restricted areas with notation
as to purpose or restriction.
[4]
Identification of lots or parcels for special
uses, whether they are to be offered for dedication or not.
[5]
Future layout for all reserved parcels, in broken
lines, in conformance with existing zoning regulations.
[6]
High points and low points shown on plan and
profiles with elevation thereof shown on profiles.
[7]
An analysis of allowable site distance at all
intersections and an indication thereof on the profile and plan.
[8]
Location of the site triangles as required by
municipal and county requirements.
(c)
Preliminary stormwater drainage system in plan
and profile.
(d)
Existing trees to remain standing should be
shown. If trees are part of a mass, the percentage of trees to be
removed shall be shown.
(e)
Proposed sanitary sewer system in plan and profile.
(f)
The tentative location and size of all other
proposed utilities.
(g)
The estimated average number of automobiles
and number and size or type of trucks or buses that will enter and
leave the site each day and during peak hours.
(h)
Proposed tentative grading plan, indicated by
contours at four-foot intervals or other intervals as may be required
by the slope and nature of the final grading.
(i)
The limits of the plat sections if the subdivision
is to be developed in more than one section, and the anticipated date
of development on each section.
(j)
Impact on community services.
[1]
An analysis of the impact of the proposed subdivision
on community services, including but not necessarily limited to the
following:
[a]
Sanitary sewer system. (If septic
systems are to be used, their effect on groundwater shall be analyzed
in a report by a geologist or other qualified professional in the
field.
[b]
Storm drainage system.
[c]
Street and highway system.
[d]
Schools.
[e]
Police and fire services.
[f]
Recreation facilities.
[g]
Public utilities, such as water,
telephone, electric and cable television.
[h]
Other such services as the Planning
Board may deem appropriate.
[2]
The analysis shall assess the impact of the
subdivision in its entirety and by section and shall compare them
to the available capacity. It shall also include the basis for each
projection.
[3]
For the purposes of Subsection D(3)(j)[1][g]
above, a letter from the public utilities stating their ability to
accept the additional required services may be considered compliance
with this article.
(k)
Any other data the Planning Board may deem appropriate.
E.
Improvement and utility plans. The improvement and
utility plans shall contain the following additional data:
(4)
(5)
Street center-line gradients in percent indicated
with arrows to establish the direction of water flow and high and
low point locations.
(6)
Street center-line grade elevations at fifty-foot
intervals determined to 1/100 of a foot.
(7)
Drainage system requirements.
(a)
Complete drainage system plan for the entire
subdivision, with appropriate development stages for each of the plat
sections, shall be shown graphically, with all existing drainage features
which are to be incorporated properly identified as "existing."
(b)
Boundaries of stormwater runoff watersheds for
each drainage structure and their area in acres.
(c)
All proposed surface drainage structures (e.g.,
ditches, channels, etc.).
(d)
All appropriate details and dimensions necessary
to explain clearly the proposed construction, including type of construction,
material, size, pitch and invert elevations among other things, in
accordance with good engineering practice.
(e)
Profiles of all proposed drainage system components.
(f)
Final design computations.
(8)
Sanitary waste disposal system (if applicable).
(a)
A sanitary sewer system design shall be indicated
in all cases where public sewer connections exist or are proposed.
(b)
A notation on the profile of the minimum water
and air retention time for exfiltration tests for each line within
the subdivision.
(c)
Typical lot layout, indicating location of system
with reference to house and water supply, and detailed drawing of
proposed sanitary waste disposal unit.
(d)
When percolation tests are taken, they shall
be shown on the plat with rates.
(11)
All off-tract improvements to be constructed
as part of the subdivision shall be detailed as above.
(12)
A contour grading plan for all areas to be distributed,
showing both existing and proposed grade at two-foot intervals and
smaller intervals if necessary.
(13)
Locations of all trees and natural features
to be removed or preserved.
(15)
Profile drawing requirements.
(b)
All profiles shall show the existing natural
grades, the typical cross section of existing or proposed roadways,
the center lines of intersecting roadways and a system of survey stations.
(c)
The center-line profile of all proposed roadways
with dimensioning on vertical curves, and notation as to gradient
elevations at fifty-foot stations and at all high and low points.
(d)
The invert profile and location of all drainage
structures in street rights-of-way and in drainage easements.
(17)
An estimate of quantities of each construction
item broken down into the following categories:
(a)
Improvements dedicated to the municipality or,
in the case of privately owned streets, improvements which would normally
be dedicated to the municipality.
(b)
Improvements owned by public utilities.
(c)
Other site improvements, exclusive of dwellings,
septic systems and private wells.
(d)
Improvements to be made off-tract.
(18)
Copies of all applications and supporting data
for permits issued by other agencies and copies of the permits.
(19)
Construction details of all improvements other
than public utilities.
(20)
Other data as may be required by the Planning
Board.
F.
Plat for final approval. Plat must be drawn up in
conformance with the provisions of the Map Filing Law and contain
all the requirements for drainage easements, encroachment line sight
triangles at intersections and new or additional rights-of-way easements.
A.
Purpose. These design standards are a guide to development
so that Kingwood Township will in the future be a coordinated, well-planned
community of good quality, with provision for desirable services and
circulation facilities.
B.
Land use standards.
(2)
Subdivision designs shall indicate consideration for
suitable protection of different types of land uses and the segregation
of vehicular and pedestrian traffic incompatible with particular uses.
(3)
Desirable sites shall be provided for public and semipublic
land uses, such as schools, firehouses, recreation sites and other
community uses as provided in N.J.S.A. 40:55D-44.
C.
Street and highway standards.
(1)
The street and highway layout shall conform to the
Master Plan and the Official Map and shall provide appropriately located
street taps or stub streets to adjacent areas.
(2)
Where a higher level of government requires a wider
street, that standard shall be met. Otherwise, the following shall
be minimum widths:
Street Class
|
Right-of-way
(feet)
|
Maximum Average Daily Traffic Volume
|
---|---|---|
Collectors, major
|
80
|
Above 8,000
|
Collectors, minor
|
60
|
800 to 8,000
|
Locals
|
50
|
Less than 800
|
Alleys
|
Not permitted
|
(3)
The street pattern within a subdivision shall be orderly
and harmonious with the surrounding area.
(4)
Local streets shall be laid out so that their use
for through traffic will be discouraged. Particular attention should
be given to eliminating possible bypasses around traffic signals and
major intersections.
(5)
Block dimensions.
(a)
Maximum length shall be 2,000 feet.
(b)
Minimum width shall relate to the zoning district
requirements for lot sizes and yards and generally shall provide for
two tiers of lots.
(c)
Special attention shall be given to blocks in
industrial and business districts to provide for access to the lots
and for parking and truck delivery.
(6)
Culs-de-sac.
(a)
Maximum length shall be 1,500 feet or adequate
to accommodate 25 lots, whichever is less.
(b)
Minimum radius for the right-of-way at the turnaround
shall be 60 feet, and the outside curb radius shall be 50 feet.
(c)
Culs-de-sac shall be placed at the end of all
stub or otherwise dead-end streets, whether or not street is to be
extended as part of a future subdivision or section thereof.
(d)
Where a cul-de-sac is of a temporary nature,
provision shall be made for future extensions of the street and reversion
of the excess right-of-way to the adjoining properties.
(7)
Intersections.
(a)
No more than two streets shall intersect or
meet at any one point.
(b)
No street shall intersect or meet at an angle
of less than 75° nor more than 105° (90° is preferred).
(c)
The center lines of all streets entering an
intersection shall pass through a single point.
(d)
Intersections on local and minor collector streets
shall be spaced a minimum of 150 feet apart measured from the points
of intersection of the center lines.
(e)
Intersections on other than local and minor
collector streets shall be spaced a minimum of 800 feet apart measured
from the points of intersection of the center lines.
D.
Preservation of natural environment.
(1)
Subdivision design shall preserve, if possible, the
natural terrain and natural drainage lines.
(2)
A conscious effort shall be made to preserve all worth-while
trees and shrubs which exist on a site. Such features may well be
suggested for park or playground areas. On individual lots or parcels,
care shall be taken to preserve selected trees to enhance the landscape
treatment of the development.
(3)
Natural fertility of the soil shall be preserved by
disturbing it as little as possible.
(4)
Open watercourses shall be recognized as community
assets. Subdivision design may well be enhanced by featuring streams
and brooks.
(5)
No topsoil shall be removed from the site or used
as spoil. Topsoil moved during the course of construction shall be
redistributed so as to provide at least six inches of cover to all
areas of the subdivision and shall be stabilized by seeding or planting.
E.
Additional standards.
(1)
Where the property to be subdivided is next to or
includes a railroad right-of-way, suitable provisions shall be made
for such things as road crossings, screening and freight access in
recognition of the relationship between the railroad and the subdivision.
(2)
Land subject to periodic or occasional flooding shall
not be platted for residential occupancy nor for any other use which
may endanger life or property or aggravate a flood hazard.
(3)
No subdivision showing reserved strips controlling
access to streets shall be approved except where the control and disposal
of land comprising such strips has been placed in the Township Committee.
(4)
Subdivisions that adjoin or include existing streets
that do not conform to widths as shown on the Master Plan or Official
Map or the street width requirements of this chapter shall dedicate
additional width along either one or both sides of the street. If
the subdivision is along one side only, 1/2 of the required extra
width shall be required to be dedicated.
F.
Utility services.
(1)
Standards and procedure.
(a)
All gas and water mains and all streetlights
and lighting standards shall be installed in accordance with the specifications
of the lighting agency, utility company or governmental authority
or district which has jurisdiction in the area.
(b)
Electric light and telephone wires and all other
utilities shall be underground.
(c)
A letter approving such a proposed installation,
and a statement as to who will carry out the construction, signed
by a responsible official of the utility agency, utility company or
governmental authority or district which has jurisdiction in the area,
shall be directed to the administrative office and shall be received
prior to the improvement and utility plans.
(d)
Every proposed lot shall be served by public
water and sewer or alternates capable of meeting all local, county
and state standards. The securing of necessary permits, approvals
and/or clearances shall be the responsibility of the applicant.
G.
Street names.
(1)
General rules for street names; definition of streets.
(a)
PLACE — A street one block long, or a
connecting link between two longer streets and not otherwise a segment
of their alignment.
(b)
COURT, CRESCENT or TERRACE — A loop street
which begins and ends on the same street and is not otherwise connected
with other streets or a cul-de-sac.
(c)
LANE, PATH, STREET or WAY — Short minor
residential streets which do not serve as secondary highways or major
streets.
(d)
AVENUE, BOULEVARD, DRIVE or ROAD — A collector
or arterial street.
(2)
Continuation of street names. All existing street
names shall be extended where proposed streets follow along their
alignment.
(3)
Historic or traditional street names. Such names shall
be preserved even through the actual street alignment has been changed
or the name does not agree with the provisions of this section.
(4)
Duplication of street names. There shall be no duplicate
street names within the Township.
(5)
The developer shall consult with the Kingwood Township
Historical Society in an effort to agree upon a name for the street(s)
within the subdivision. If the developer and the Kingwood Township
Historical Society are able to agree upon a name for the street, that
name shall be recommended for adoption by the Kingwood Township Committee.
In the event that the developer and the Kingwood Township Historical
Society are unable to agree upon a name, both the developer and the
Kingwood Township Historical Society shall submit a proposed name
for the street to the Kingwood Township Committee. The Kingwood Township
Committee may then select and approve one of the two names submitted
as the name for the street. The Kingwood Township Committee shall
retain the sole and exclusive right to name any street within the
Township.
[Added 11-18-1996 by Ord. No. 9-13-96; amended 10-1-2015 by Ord. No.
18-11-2015]
A.
The following improvements will be required except
where this chapter specifically waives the requirement or when the
Planning Board waives the requirement by specific resolution in conjunction
with hardship, peculiar situations or special development provisions
such as a cluster single-family development:
B.
Street design standards. The following minimum standards
shall be required for all streets other than county or state roads
and highways constructed in Kingwood Township:
(1)
Horizontal alignment shall have:
Collector, Major
(feet)
|
Collector, Minor
(feet)
|
Local
(feet)
| |
---|---|---|---|
Minimum center-line radius
|
600
|
500
|
300
|
Minimum tangent between reverse curves
|
200
|
160
|
120
|
Intersection radius (curb returns)
|
40
|
30
|
25
|
Minimum intersection radius shall be determined
by highest street class in intersection; right-of-way line shall be
concentric thereto
|
(2)
Vertical alignment shall have:
(a)
Minimum grade of 0.5%.
(b)
Maximum grade of 6.0% (8.0% on local streets),
or
(c)
Maximum grade for less than 200 feet of 10.0%,
and
(d)
Maximum grade within 100 feet of a right-of-way
intersection of 4.0%.
(e)
All changes in grade shall be connected by vertical
curves.
(f)
The length (L) in feet of a vertical curve shall
be related to the algebraic difference in the percent of grade (A)
and a constant according to the following formula: L = KA. The minimum
"K" values shall be as follows:
Street Class
|
Crest Curve
(feet)
|
Sag Curve
(feet)
|
---|---|---|
Collector, major
|
145
|
100
|
Collector, minor
|
65
|
60
|
Local
|
28
|
35
|
Intersections (stop conditions)
|
3
|
3
|
(5)
In regulating subdivisions, these provisions shall
be considered the minimum requirements generally consistent with the
public welfare, and the Planning Board in consultation with the Township
Engineer shall modify or extend these provisions in appropriate cases
as may be deemed necessary for the public good. Modifications to these
standards shall be based on: A Policy on Design of Urban Highways
and Arterial Streets, latest edition, published by the American Association
of State Highway Officials, or other acceptable reference.
(6)
Standards for all other roads shall be determined
by appropriate authorities.
(7)
Required curbing and construction types for street
improvements. Curbing and construction types for street improvements
shall be in accordance with the following requirements:
(b)
Curb construction shall conform to the New Jersey
Department of Transportation standards.
(c)
These provisions shall be considered minimum
requirements generally consistent with the public welfare, and the
Township Engineer shall modify or extend these provisions in appropriate
cases as may be deemed necessary for the public good.
C.
General street improvements.
(1)
Driveway aprons.
(a)
All driveways or other parking areas shall have
driveway aprons extending from the curbline to the front property
line.
(b)
Driveway aprons shall be of concrete, have a
six-inch thickness and shall have widths as follows:
Residential
|
Minimum
(feet)
|
Maximum
(feet)
|
---|---|---|
Single driveway
|
8
|
20
|
Double driveway
|
16
|
20
|
Other uses
|
25
|
40
|
(2)
Sidewalks.
(a)
All sidewalks shall be four inches thick and
at least four feet wide, constructed of one course of portland concrete,
except that a sidewalk forming part of a driveway apron shall be six
inches thick, at grade with abutting sidewalks, and of the same construction
material as abutting sidewalks.
(b)
All sidewalks shall be located one foot within
the street right-of-way.
(3)
Street signs. Street signs shall be provided by the
subdivider conforming to current Township standards.
(4)
Street trees.
(a)
Street trees shall be provided in all subdivisions.
(b)
Trees shall be of nursery stock of an approved
species grown under the same climatic conditions as at the location
of the development. They shall be of symmetrical growth, free of insect
pests and disease, suitable for street use and durable.
(c)
The average trunk diameter measured at a height
of six feet above the finished grade level shall be a minimum of two
to three inches, depending on good practice with reference to the
particular species to be planted.
(d)
Trees shall be planted at intervals of from
40 to 60 feet apart (depending upon the species) along both sides
of the street and at least 15 feet from any sidewalk, curb, gutter
or other right-of-way improvement as provided for in this regulation,
whether such improvement is proposed to be built or not.
(e)
All planting shall be done in conformance with
good nursery and landscape practice.
(5)
Planting strips. All planting strips within street
rights-of-way shall be finish graded, properly prepared and seeded
or sodded with lawn grass in conformance with good nursery and landscape
practice.
(6)
Shade trees.
(a)
Shade trees shall be provided in all subdivisions.
(b)
Trees shall be of nursery stock of an approved
species grown under the same climatic conditions as at the location
of the development. They shall be of symmetrical growth, free of insect
pests and disease, suitable for residential use and durable.
(c)
The average trunk diameter measured at the height
of six feet above the finished grade level shall be a minimum of one
to two inches, depending on good practice with reference to the particular
species to be planted.
D.
Utility installations.
(1)
Sanitary sewers.
(2)
Water mains and fire hydrants.
(a)
Water mains shall meet the requirements of the
water operating utility except as provided below.
(b)
Subdivisions not served by public water shall
provide installation of sleeves and whatever else is necessary to
prevent opening of the street at such time as water lines are installed.
(c)
Subdivisions served by semipublic or private
water companies shall have a minimum main size of eight inches in
diameter, except dead-end lines, which may be six inches in diameter.
(3)
Streetlighting shall be guided by the following minimum
requirements:
Street Class
|
Minimum Average Maintained Footcandles
|
Uniformity
(average to minimum)
|
---|---|---|
Collectors, major
|
0.5
|
6:1
|
Collectors, minor
|
0.3
|
—
|
Local
|
0.2
|
—
|
(4)
Other utilities shall be designed to meet the requirements
of the operating utility, but shall be designed to be serviced for
repair or additional installation without disruption to streets.
E.
Drainage system design standards.
(1)
Grading and drainage system plan.
(a)
A preliminary grading and drainage system plan
shall be a part of the preliminary plat. It shall indicate in general
terms a proposal for an adequate system of drainage structures to
carry off and store or discharge the stormwater runoff and natural
drainage water which originates not only within the property boundaries
but also beyond the property boundaries. It should perpetuate existing
drainage patterns.
(b)
The public improvement and utilities plan and
profiles shall show the final drainage plan, site grading and street
profiles.
(c)
No stormwater runoff or natural water shall
be so diverted as to overload existing drainage systems or create
flooding or the need for additional drainage structures on other private
properties or public lands without proper and approved provisions
being made for taking care of these conditions. Watersheds with drainage
areas over 1/2 square mile come under the jurisdiction of the New
Jersey Department of Environmental Protection. Approval of this agency
must be secured for any culvert or bridge crossing falling into this
category. Copies of any correspondence with the Department of Environmental
Protection shall be supplied to the Township Engineer.
(d)
The stormwater management plan required under § 115-6.2 shall be submitted under the seal of a licensed professional engineer and shall show, among other things, all existing and proposed natural and artificial drainage courses and other features for the control of drainage, erosion and water generally; the calculated volume of water runoff from the slopes and from the lot in question, as improved; the existence of all natural and artificial drainage courses and facilities within 500 feet of the lot which are or will be used to carry or contain the runoff from the slope and the lot; and the effect of any increased water runoff on all adjacent properties and any other property which will be materially affected by increased water runoff.
[Added 7-19-1999 by Ord. No. 10-10-99]
(2)
Collection system.
(a)
The quantities of water for which collection
system shall be designed shall be in accordance with the rational
method of design using the formula: Q = CIA.
[1]
Where "Q" is the required capacity in cubic
feet per second for the collection system at the point of design.
[2]
"A" is the tributary drainage area in acres
and shall include areas tributary from outside sources as well as
from within the site itself.
[3]
"C" is the coefficient of runoff applicable
to the drainage area and shall be based on consideration of soil conditions,
average slope of the drainage area and degree of ultimate development
of the area, but in no case be less than the following coefficients:
Topography
| |||||
---|---|---|---|---|---|
Usage
|
Density
(Units/Acre)
|
Flat
0%-10%
|
Rolling
10%-20%
|
Hilly
Over 20%
| |
Residential
| |||||
High density
|
4-6
|
0.50(0.40)
|
0.55(0.45)
|
0.60(0.55)
| |
Medium density
|
1-4
|
0.45(0.35)
|
0.50(0.40)
|
0.55(0.55)
| |
Low density
|
Less than 1
|
0.40(0.30)
|
0.45(0.35)
|
0.50(0.45)
| |
Impervious surfaces
| |||||
Undeveloped woodland
|
0.30(0.20)
|
0.35(0.25)
|
0.50(0.45)
| ||
Pasture and grassed areas
|
0.30(0.20)
|
0.36(0.20)
|
0.42(0.37)
| ||
Cultivated fields
|
0.50(0.50)
|
0.60(0.50)
|
0.72(0.62)
|
The above runoff coefficients assume
that clay soils (sand, gravel soils coefficients indicated in parenthesis)
are present and that paved areas (parking) have been provided. Any
deviation from these factors would result in an adjustment in "C"
values. Determination of nonlisted uses shall be subject to special
study and approved by the Township Engineer.
|
[4]
"I" is the rainfall intensity in inches per
hour and shall be determined from the graph entitled "Rainfall Intensity
Duration for Essex and Union Counties," copies of which are on file
with the Township Clerk and Engineer and are made a part hereof.
(b)
The following intensities shall be used as a
guide to determine "Q":
(c)
Pipes or conduits shall be designed using Manning's
equation for velocity:
V equals 1.486 x R 2/3 x S 1/2
n
|
[1]
"R" is the hydraulic radius of the conduit flowing
full.
[2]
"n" is Manning's roughness coefficient, which
shall be as follows:
Concrete pipe
|
0.012
|
Corrugated metal
|
2 2/3 x 1/2 corrugations
|
Plain or fully coated
|
0.024
|
Paved invert
|
0.020
|
Fully paved
|
0.012
|
3" x 1" corrugation
|
0.027
|
6" x 2" corrugation (field bolted)
|
0.032
|
[3]
"n" for other materials shall be recommended
by the Township Engineer.
[4]
"S" is the slope of the energy gradient in feet
per foot and shall generally be considered as being the same as the
slope of the invert of the pipe (So). However, such slopes shall be
checked against the available hydraulic gradient whenever the system
flows full or where the system discharges into a body of water.
(d)
Velocity.
[1]
Wherever possible to ensure a self-cleaning
velocity, pipes shall be placed on grades that will provide a minimum
velocity of three feet per second when flowing 1/4 full. The following
table indicates minimum grades to accomplish this:
Desirable Minimum Gradients for Concrete
Pipe
| |
---|---|
Diameter
(inches)
|
Slope
N equals 0.012
|
15
(minimum permissible)
|
.008
|
18
|
.006
|
24
|
.005
|
30
|
.004
|
36
|
.003
|
42
|
.002
|
48
|
.0016
|
54
|
.0014
|
60
|
.0012
|
66
|
.0011
|
[2]
Where steep grades are encountered, full-flow
velocities over 15 feet per second should be avoided by the use of
drop manholes or inlets in the line.
(e)
Alignment.
[1]
Manholes or inlets shall be provided in drain
lines not more than 350 feet apart and wherever branches are connected
or sizes are changed and wherever there is a change in alignment or
grade.
[2]
Alignment of pipes shall be in a straight line
between manholes or inlets, except that radius pipe may be used in
pipes over 60 inches in diameter, provided a manhole or inlet is incorporated
at not more than 500-foot intervals.
(f)
Inlet spacing and headwalls.
[1]
Inlet spacing shall be such as to permit a spread
of water to the edge of the traveled way, edge of shoulder for rural
roads or edge of parking lane (eight feet maximum) for urban roads
during a storm with an intensity of three inches per hour. Inlet spacing
may vary up to 350 feet, depending on the contributory drainage area,
the longitudinal and cross slopes of the roadway. Inlets at intersections
shall be located to intercept water before it crosses the intersection
or crosswalk area. Inlets shall not be placed in the crosswalk area.
Pairs of inlets shall be placed at low points.
[2]
Inlets intercepting swales or in parking areas
shall be designed such that not more than six inches (three inches
in parking areas) shall pond over an inlet during a storm with an
intensity of three inches per hour.
[3]
Pipelines starting or ending in ditches, streams
or other bodies of water shall terminate with either a headwall or
a flared end section. Riprap or other suitable material shall be provided
to prevent erosion.
(3)
Open channel flow. Where brooks, ditches, swales or
other channel flows are used, they shall be designed by the use of
Manning's equation as indicated for collection systems above, with
the following considerations:
(a)
The friction factor (n) shall be:
Unlined
| ||
Earth uniform section
|
0.018-0.027
| |
Earth nonuniform section
|
0.025-0.040
| |
Earth not maintained
|
0.080-0.012
| |
Lined-concrete
| ||
Finished
|
0.015
| |
Rough
|
0.25
| |
Riprap
|
0.35
|
(b)
Design velocities should be limited to a nonerosive
velocity and shall be determined based on an analysis of the soil
conditions, but in any case shall not exceed the following:
Materials
|
Velocity
|
---|---|
Fine sand to fine loam
|
2.5 to 3.5 fps
|
Stiff clay to hardpan
|
3.75 to 6.00 fps
|
Concrete-lined ditch
|
15 fps
|
Velocities shall be controlled by use of check
dams or baffles where necessary
|
(c)
A ditch or brook right-of-way of sufficient
minimum width, to include a ten-foot access strip in addition to the
width of the ditch or brook from bank top to bank top, shall be offered
for dedication to the Township for drainage purposes. Such right-of-way
shall be shown on the drainage plan and on the final plat.
(d)
Swales shall be provided in residential areas
so that an area not in excess of the minimum lot area in the subdivision
shall drain without being intercepted. This requirement may be varied
for wooded sites or pervious soils.
(e)
Swales shall be provided in other areas so that
not less than one impervious acre shall drain without being intercepted.
(f)
Jute mesh slope protection shall be used in
swales or grassed ditches on gradients exceeding 3%. Paved ditches
shall be used where these gradients exceed 10% and significant discharge
is expected.
(g)
Side slopes for drainageway shall be as follows:
Facility
|
Maximum Side Slope
|
---|---|
Channel
|
2:1
|
Ditch
|
4:1
|
Swale
|
6:1
|
(4)
Minimum cover and structural considerations.
(a)
All pipe shall be concrete unless specific unique
design considerations exist for the use of other types of materials
and then only with the approval of the Township Engineer.
(b)
Minimum cover for reinforced concrete pipe shall
be based upon a depth of cover of two feet from the top of pavement.
(c)
Minimum cover for corrugated metal pipe shall
be based upon a depth of cover of one foot from top of pipe to top
of pavement or upon manufacturer's recommendations, whichever is greater.
(d)
Maximum cover for pipe shall be based on rational
analysis through use of Marston's formula. For reference, see the
booklet entitled "Reinforced Concrete Pipe Culverts" issued by the
United States Department of Commerce and manufacturer's recommendations
for flexible pipe.
(e)
Standard-strength reinforced concrete pipe shall
conform to Class 3, Wall B, and extra-strength reinforced concrete
pipe shall conform to Class 4, Wall B, of ASTM Specifications C-76
of AASHO Designation M-170. Strengths for corrugated metal pipe shall
be as required by the New Jersey State Highway Department Standard
Specifications, current edition, and amendments.
(f)
Box culverts shall be designed in accordance
with AASHO recommendations.
(g)
All inlets shall be in accordance with the New
Jersey Department of Transportation Standards and Specifications.
(5)
Design criteria not covered herein.
(a)
Criteria not incorporated herein necessary for
design shall be based on recommendations incorporated in Hydraulic
Engineering Series circulars published by the Federal Highway Administration
and ASCE publication, current edition, and as approved by the Township
Engineer.
(b)
Design methods prepared by Soil Conservation
Service may be used for drainage design with approval of the Township
Engineer.
F.
Construction of improvements. All work shall be done
in conformance with current construction standards of the Township
of Kingwood or in lieu thereof the current edition of the New Jersey
State Highway Department Standard Specifications for Road and Bridge
Construction, 1961, with amendments and revisions thereto, and in
conformance with the New Jersey Department of Transportation Standard
Construction details.