Prior to an action by the Planning Board approving
a plat, the applicant shall be required to complete, in accordance
with the Planning Board's decision and to the satisfaction of the
appropriate Village departments, all the street and other improvements
specified in the action approving said plat or, as an alternative,
to file with the Village Board a bond in an amount estimated by the
Planning Board to secure to the Village the satisfactory construction
and installation of the incompleted portion of the required improvements.
All required improvements shall be made by the applicant at his expense
without reimbursement by the Village.
A.
Performance bonds shall comply with the requirements
of § 7-730 of the Village Law and shall be satisfactory
to the Village Board as to form, sufficiency and manner of execution.
A period of one year, or such other period as the Planning Board may
determine appropriate, within which required improvements must be
completed, shall be specified by the Planning Board and expressed
in the bond.
B.
The bond shall also provide that an amount determined
adequate by the Planning Board shall be retained for a period of one
year after the date of completion of the required improvements to
assure their satisfactory condition.
Monuments shall be placed at all block corners,
angle points, points of curvature in streets and points of tangency
or horizontal curves and at immediate points intervisible from each
other; however, in no case shall there be fewer than four permanent
monuments per block. At least one monument in each subdivision shall
be related to the United States Geological Survey system and shall
bear the true elevation above sea level. In addition, markers shall
be placed at all points when street lines intersect the plat boundary
and at all lot corners. The monuments and markers shall be of such
material, size and length as may be approved by the Village Engineer.
The monument material shall be stated on the plat for documentation
purposes.
Facilities for water and sewerage shall be provided
in each new subdivision in accordance with the requirements of the
appropriate agency having jurisdiction over the planning and installation
of these in the area of the subdivision; however, the following minimum
requirements of the Village shall be met:
A.
The central water supply systems shall be designed
with adequate pressures, mains and fire hydrants to meet Association
of Fire Underwriters' specifications for a Class C protected area.
B.
All water mains shall be at least six inches in diameter.
C.
Sanitary sewers shall not be used for stormwater drainage.
D.
The central sewerage system shall provide four-inch
minimum size connection to each lot.
A.
Capacity.
[Amended 9-28-2010 by L.L. No. 1-2010]
(1)
All
projects involving existing Village roads or the construction of new
roads to be dedicated to the Village shall conform to current Village
design standards. In general, the proposed drainage system shall be
adequate to prevent any increase in the rate of surface water runoff
or otherwise contribute to downstream flooding during a storm of any
magnitude up to and including a twenty-five-year return frequency.
If conditions warrant, as determined by the Village Engineer, the
design standards may be increased to a fifty-year or one-hundred-year
storm return frequency.
(2)
Drainage
methods and calculations shall be presented in a report for review
by the Village Engineer, Planning Board, and Village Highway Department.
Drainage methods shall include measures for quantitative and qualitative
controls of stormwater runoff in accordance with the New York State
Stormwater Design Manual, latest revised edition. Hydrologic and hydraulic
analysis calculations used to size stormwater management practices
shall be performed by using the United States Department of Agriculture
Soil Conservation Survey Design Procedures, outlined in Technical
Release No. 55, Urban Hydrology for Small Watersheds (TR-55), or other
approved methodology.
(3)
The drainage design shall conform to the requirements presented within the Village of Rhinebeck Chapter A136, Subdivision Regulations, and Chapter A125, Road Specifications, and also the New York State Department of Environmental Conservation Stormwater Requirements. In cases of conflict, NYSDEC requirements shall prevail.
B.
General design.
(1)
Preferred runoff pattern. Preferred design of streets
and grading in relation to storm drainage shall be such that runoff
from roofs, driveways and other impervious surfaces will be collected
in the ditches and/or gutters along the street in short runs [300
or 400 feet] and will then be diverted from the surface into storm
sewers or natural watercourses. Streets should be located away from
watercourses unless storm sewers are to be installed.
(2)
Downstream disposal. Subdivision and development of
an area increases and concentrates the runoff of stormwater from the
area. Applicants are warned that such increase may cause flood or
erosion damage to undeveloped properties lying downstream. Storm drainage
channels opening on unimproved land shall empty into natural watercourses
unless suitable agreement is reached with the owner of the downstream
property for other method of handling. In any instance, the disposal
of storm drainage downstream shall be satisfactory to the Planning
Board as advised by the Village Engineer.
C.
Open watercourses. The use of open watercourses for
drainage may involve problems relating to safety, erosion control,
stagnant water, protection of capacity and appearance, all of which
shall be given adequate attention by the developer as follows:
(1)
Safety. Broad, shallow courses shall be created wherever
necessary to increase capacity or eliminate steep banks, except in
those areas where natural conditions are such that erosion of banks
will not occur. Ditches shall, wherever feasible, be in the shape
of a wide-top V with rounded or squared invert.
(2)
Erosion control. Adequate measures shall be taken
to provent erosion. The Planning Board shall require seeding, sodding,
planting, riprapping or such other measures as may be necessary to
prevent scouring. Designed velocities shall not exceed those shown
in Table A, page 18-10, Seelye Data Book for Engineering.
(3)
Drainage. The developer shall avoid the creation or
continuation of swampy areas or stagnant pools. The Planning Board
shall require fill and/or channel improvements in order to forestall
such problems.
(4)
Protection of capacity. The developer shall provided
adequate measures for the protection of open drainage channels by
establishing drainage easements sufficiently wide [generally 20 feet]
to enable the working of the channel by motorized equipment or, alternately,
where authorized by the Planning Board, a center block park of a minimum
of 50 feet. All easements shall prohibit the erection of structures,
the dumping of fill or the alteration or obstruction of the watercourses
without the written permission of the Village Board. Property lines
shall be so drawn as to allow drainage easements along side and rear
lot lines, except that drainage easements may be allowed to cross
lots larger than one acre.
(5)
Appearance. As natural watercourses can be an attractive
asset to the subdivision as well as to the community, the developer
shall, where possible, improve and beautify the watercourses to this
end.
D.
Design of storm sewers.
(1)
Size and grade. Storm sewers shall have a minimum
diameter of 15 inches and a minimum grade of 0.5%.
(2)
Manholes. Manholes shall not be more than 300 feet
apart where pipe sizes of 24 inches or less are used and not more
than 540 feet apart where larger sizes are installed.
(3)
Change in direction. Special sections of 10 to 15
feet radii shall be installed where abrupt changes are made in alignment.
E.
Design of ditches and gutters.
(1)
Length of flow. Subdivisions shall be so designed
that length of flow of water in gutter or roadside ditch does not
exceed 300 feet, except as permitted by the Planning Board. Runs exceeding
the maximum shall be put in storm sewers or diverted to natural drainageways.
(2)
Minimum grade. All enclosed drainage courses shall
be designed with sufficent grade to create a water flow velocity of
three feet per second. A lesser grade may be permitted by the Planning
Board where such a grade cannot be achieved.
(3)
Street crossing. Water in gutters and ditches shall
not be allowed to flow over intersecting streets but shall be placed
in adequate culverts.
(4)
Depth and shape of ditches. Where roadside ditches
are permitted for runs of more than 300 feet or where subgrade drainage
is necessary, the bottom of such ditch should be below the subgrade
and, at a minimum, should be approximately 18 inches below the crown
of the road. Ditches shall be V-shaped or parabolic with sides sloping
at approximately one-inch vertical to three inches horizontal, except
where another cross-section plan is authorized.
F.
Erosion control. Suitable headwalls, endwalls, ditch
seeding or sodding and other procedures or devices to prevent erosion
shall be used.
A.
Streets shall be graded and improved with pavement,
street signs, sidewalks, streetlighting standards, curbs, gutters,
trees, water mains, sanitary sewers, storm drains and fire hydrants,
except where the Planning Board may waive, subject to appropriate
conditions, such improvements as it considers are not requisite in
the interest of public health, safety and general welfare.
B.
Underground utilities required by the Planning Board
shall be placed between the paved roadway and street line to simplify
location and repair of the lines, and the subdivider shall install
underground service connections to the property line of each lot before
the street is paved. The location of such utilities shall be identified
on the plat to permit future recovery.
C.
Streets, drainage structures, street signs and monuments
shall be installed in accordance with the latest Village road specifications.[1] When required by the Planning Board, curbs and sidewalks
shall be installed in accordance with the latest specifications therefor
also found in the Village road specifications. Sanitary sewers, water
mains, fire hydrants and trees shall be installed in accordance with
specifications therefor established by the Dutchess County Department
of Health and local fire district and also in accordance with any
specifications for such improvements which may be established by the
Village in the future.
The Village may employ an inspector, engineer
and/or attorney to act as agents of the Planning Board for purposes
of reviewing a project at any stage of the proposal and/or to assure
the satisfactory completion of improvements required by the Planning
Board. The applicant shall pay to the Village actual incurred costs
of these services. If the Planning Board or its agent finds, upon
inspection, that any of the required improvements have not been constructed
in accordance with the approved drawings, the applicant and the bonding
company will be severally and jointly liable for the costs of completing
said improvements according to specifications. If payment is not made
within 60 days of billing date by the Village, the Planning Board
reserves the right to cancel further consideration of the application.
The Board may accept assurance from each public
utility company whose facilities are proposed to be installed. Such
assurance shall be in writing, addressed to the Board, stating that
such public utility company will make the installations necessary
for the furnishing of its services within a specified time, in accordance
with the approved plat.
