The SUBDIVIDER shall observe the following general requirements and principles of land SUBDIVISION.
The PLAN shall conform with the HUDSON Master Plan, the Official Map, if and when one is adopted, Chapter 334, Zoning, and any other pertinent state or local laws or regulations.
A. 
Land of such character that it cannot be safely used for building purposes because of exceptional danger to health or peril from fire, flood or other menace shall not be platted for residential occupancy, nor for such other uses as may increase danger to health, life or property or aggravate the flood hazard, until appropriate measures have been taken by the SUBDIVIDER to eliminate such hazards. No floodway shall be obstructed.
B. 
Flood hazard.
(1) 
Sufficient evidence (construction drawings, grading and land treatment plans) shall be submitted so as to allow a BOARD determination that:
(a) 
All such proposals are consistent with the need to minimize flood damage.
(b) 
All public utilities and facilities, such as sewer, gas, electrical and water systems are located, elevated and constructed to minimize or eliminate flood damage.
(c) 
Adequate drainage is provided so as to reduce exposure to flood hazards.
(2) 
Adequate design information shall also be submitted to the BOARD assuring that new or replacement water systems and/or sanitary sewerage systems are designed to minimize or eliminate infiltration of floodwaters into the systems and discharges from the systems into floodwaters and that on-site waste disposal systems are located so as to avoid impairment of them or contamination from them during flooding.
The PLANNING BOARD may require use of a shared ACCESS road where two or more SUBDIVISIONs are being proposed, which SUBDIVISIONs shall be considered a single parcel of land for this specific purpose, even though acquired by more than one conveyance or held nominally by more than one OWNER.
A. 
For minimum area and frontage requirements for new residential SUBDIVISIONs, refer to the Hudson, New Hampshire, Zoning Ordinance, Article VII, Dimensional Requirements, Hudson Town Code § 334-27, Table of Minimum Dimensional Requirements.
B. 
(Reserved)
C. 
No LOT that will result from a SUBDIVISION shall have an interior LOT line that intersects a front LOT line at an angle of less than 45° as measured from the front LOT line.
A. 
No STREET or HIGHWAY RIGHT-OF-WAY shall be less than 50 feet in width and may be required to be more if a greater STREET width is required by § 289-14 above or is warranted in the opinion of the BOARD. Existing streets shall be widened as if they were new streets, and only 1/2 of their additional widening shall be required on each side.
B. 
Cul-de-sac roads.[1]
(1) 
RIGHT-OF-WAY and pavement widths. Culs-de-sac, or dead-end streets, designated to be permanently closed at one end, shall have a RIGHT-OF-WAY width not less than 50 feet leading up to the turnaround. The pavement width leading up to the turnaround shall be 24 feet. The pavement width for the turnaround shall be 24 feet.
[Amended 4-24-2019 by Amdt. No. 1]
(2) 
Cul-de-sac roadway length. A cul-de-sac STREET shall not exceed 1,000 feet in length, and shall measure from the center point of the outside edge of the cul-de-sac turnaround to the point of intersection at the center line of an intersecting street. Said intersecting STREET shall have, at minimum, two intersections with other streets, leading to a collector/arterial STREET or limited-ACCESS HIGHWAY.
(3) 
Radial turnaround. Closed ends of cul-de-sac streets shall be provided with a radial-shaped turnaround having a minimum RIGHT-OF-WAY radius of 75 feet and a minimum radius to the outside edge of pavement, or curb, of 65 feet. The illustrative sketches further define and clarify the turnaround requirements for dead-end or cul-de-sac streets.
(4) 
Landscaping. Cul-de-sac roadways shall have a permanent area in the center of the turnaround. The center of the turnaround shall have suitable drainage and/or landscaping as approved by the PLANNING BOARD.
(5) 
Signage. A dead-end informational sign shall be placed at the beginning of the cul-de-sac roadway. The dead-end sign shall have black lettering on a yellow background, a sign area of 18 inches by 24 inches and a minimum height of six feet measured from the ground to the top of the sign as affixed to a pole.
[1]
Editor's Note: The Typical Offset Cul-De-Sac illustration and the Typical Straight Cul-De-Sac illustration are included as attachments to this chapter.
C. 
Horizontal and vertical curves.
(1) 
No horizontal curve shall have a center line radius of less than 150 feet except on a cul-de-sac.
(2) 
No vertical curve shall have K values less than the following: 40 Sag; 30 Crest. Note: K values at stop condition situations shall be evaluated on an individual basis.
D. 
Streets in cut or fill shall be provided with side slopes not steeper than two feet horizontal to one foot vertical. All side slopes shall be constructed outside the right-of-way.
E. 
STREET intersections and curves shall be designed to PERMIT adequate visibility for both pedestrian and vehicular traffic. Intersections shall comply with applicable sections of Chapter 193, DRIVEWAYS.
F. 
Grades of all streets shall conform in general to the terrain and shall, so far as practicable, not exceed 4% for major streets and 7% for minor streets. No STREET shall have a grade of less than 1%.
G. 
The widths of blocks shall not be less than 500 feet.
H. 
Intersecting property lines at STREET intersections shall be joined by a curve of at least 1/2 the width of the wider STREET in radius.
I. 
Streets shall be laid out to intersect as nearly as possible at right angles. No STREET shall intersect another at an angle of less than 60°. Streets entering opposite sides of another STREET shall be laid out either directly opposite one another or with a minimum offset of 125 feet between their center lines. All STREET deflections shall be curved.
J. 
No STREET shall be accepted by the TOWN OF HUDSON until after a public hearing and approval, in writing, by the Board of Selectmen.
K. 
STREET and HIGHWAY layouts. All streets and HIGHWAYs in the TOWN OF HUDSON shall be laid out in accordance with the procedures outlined in RSA 234 and by the final PLAT of this chapter. A deed shall be given the Town by the OWNER of the SUBDIVISION covering all STREET areas within the SUBDIVISION.
L. 
STREET HIGHWAY layout requirements. Any person interested in having a STREET or HIGHWAY laid out by the Town shall petition therefor on a form to be supplied by the Board of Selectmen and shall attach to said petition a PLAN satisfying all requirements of this chapter and Chapter 334, Zoning.
M. 
PLAN requirements. The petitioner(s) for STREET or HIGHWAY layout shall cause to be prepared and submitted to the Board of Selectmen, in accordance with instructions from the Board of Selectmen, an accurate PLAN and profile, showing the present length of frontage of each LOT, the names of OWNERs thereof and the land to be taken, showing the number of square feet to be taken from each LOT and also showing such references to bounds and other marks on the premises as shall enable the Board of Selectmen to locate said STREET with accuracy.
(1) 
Said PLAN and profile shall be submitted to the Board of Selectmen with the petition for acceptance and shall contain a horizontal scale of one inch equals 50 feet and a vertical scale of one inch equals five feet.
(2) 
The PLAN and profile shall contain existing grades and proposed grades of all streets. Existing and proposed grades shall be adequately differentiated.
(3) 
The Board of Selectmen may make such alterations in the PLAN and proposed grades as they may deem necessary.
N. 
Streets which join or are in alignment with streets of abutting or neighboring properties shall bear the same name. Names of new streets shall not duplicate, nor bear phonetic resemblance to, the names of existing streets within the Town. Where practical, names shall have an historical connection.[2]
[2]
Editor's Note: For related provisions, see Ch. 281, Street Numbering. For the inventory of streets, see Ch. A340.
O. 
All STREET names, in SUBDIVISIONs, shall be identified at all intersections by metal signs, in accordance with HIGHWAY Department specifications. The SUBDIVIDER shall, at his/her/its own expense, install these STREET signs on metal posts, two inches inside diameter and 10 1/2 feet long, galvanized. The galvanized steel posts shall be set in concrete with the top of the post being eight feet above the ground, subject to approval by the PUBLIC WORKS DIRECTOR. The signs shall be metal, in conformity with new signs purchased by the Town, two-faced and reflectorized, six inches high with three-and-one-half-inch letters embossed and reflectorized with green background and white letters, of aluminum metal. The PUBLIC WORKS DIRECTOR is charged with the responsibility of approving final installation of all STREET signs.
[Amended 10-9-2018]
P. 
Any bridge or culvert shall be designed by a registered engineer, which design shall accompany the preliminary layout.
Q. 
STREET and HIGHWAY acceptance requirements. Upon completion of the layout proceedings, the parties interested in having the Town accept the STREET or HIGHWAY shall petition therefor on a form to be supplied by the Board of Selectmen, but no STREET or HIGHWAY shall be accepted unless or until the provisions of this chapter are fully satisfied.
R. 
Installation of improvements.
(1) 
The PLANNING BOARD shall weigh the burden that proposed DEVELOPMENT places on public facilities, infrastructure, sewers and amenities and shall require the installation of public improvements, both on-site and off-site, to compensate for this burden. Improvements may include, but are not limited to:
(a) 
Granite curbing.
(b) 
Sidewalk and STREET trees.
(c) 
Improvements to existing roadways and drainage.
(d) 
Traffic control devices.
(e) 
Open space.
(f) 
Recreational space.
(g) 
Moneys granted in lieu of land for recreational space, which shall be held by the Town in a nonlapsing fund for the future purchase and DEVELOPMENT of recreational space/facilities to serve this particular neighborhood/development.
(h) 
Improvements to nearby traffic corridors as warranted by the Town's cost allocation procedure traffic study.
(2) 
All requested improvements, whether on-site or off, shall be consistent with the standards enunciated by the New Hampshire Supreme Court and this legislature.
S. 
The arrangement, character, extent, width, grade and location of all streets shall conform to the Master PLAN whenever possible and shall be considered in their relation to existing and planned streets, to topographical conditions, to public convenience and safety and in their appropriate relation to the proposed uses of the land to be served by such streets.
T. 
Where such is not shown in the Master Plan, the arrangement of streets in a SUBDIVISION shall either:
(1) 
Provide for the continuation or appropriate projection of existing principal streets in surrounding areas; or
(2) 
Conform to a PLAN for the neighborhood approved or adopted by the BOARD to meet a particular situation where topographical or other conditions make continuance or conformance to existing streets impracticable.
U. 
Service streets shall be so laid out that their use by through traffic shall be discouraged.
V. 
Where a SUBDIVISION abuts or contains an existing or arterial street, the BOARD may require marginal-access streets, reverse frontage with screen planting contained in a nonaccess reservation along the rear property line, deep LOTs with rear service alleys or such other treatment as may be necessary for adequate protection of residential properties and to afford separation of through and local traffic.
W. 
Where a SUBDIVISION borders on or contains a railroad RIGHT-OF-WAY or limited-access HIGHWAY right-of-way, the BOARD may require a STREET approximately parallel to and on each side of such RIGHT-OF-WAY at a distance suitable for the appropriate use of the intervening land, as for park purposes in appropriate districts. Such distances shall also be determined with due regard for the requirements of approach grades and future grade separations.
X. 
Pedestrian rights-of-way not less than 15 feet wide may be required where deemed essential to provide circulation or ACCESS to schools, playgrounds, shopping centers, transportation or other community facilities. Where such pedestrian rights-of-way are provided, the developer shall clear the areas of obstructing rocks, trees and undergrowth, bring the RIGHT-OF-WAY to suitable grade and construct a four-foot-wide BITUMINOUS CONCRETE sidewalk in accordance with the Department of Public Works specifications.
Y. 
All proposed streets shall be designed with intersections of not more than two-percent slope for a distance of 100 feet from the edge of pavement of the intersection to the first point of vertical curvature. The center line of the intersecting streets shall intersect one another as near to a ninety-degree angle as possible but not less than 60°.
All utility installations, modifications, easements and other pertinent elements of the PLAN shall conform to § 276-13 of the LAND USE REGULATIONS.
All stormwater planning and management shall comply with Chapter 290 of the LAND USE REGULATIONS. In addition:
A. 
LOTs shall be laid out and graded to eliminate flood or stagnant water pools.
(1) 
Where a building foundation is less than one foot above finished road grade, suitable mechanical or natural drains shall be installed, subject to approval of the Selectmen.[1] The type of construction and size of pipe shall be clearly designated on the final plot plan, as approved by the BOARD.
[1]
Editor's Note: Approval of the PLANNING BOARD is the requirement for installation of drains.
(2) 
No water shall be permitted to run across a STREET on the surface, but shall be directed into catch basins and piped underground in a pipe of adequate size, approved by the Selectmen,[2] in writing.
[2]
Editor's Note: Approval of the size of the underground pipe is provided by the PLANNING BOARD.
B. 
Where feasible, stormwater should be directed to enter the nearest open STREAM channel.
(1) 
Stormwater runoff, except in areas where the LOT size is 40,000 square feet or larger, or where it is in already existing open STREAM channels, shall not be permitted to flow upon the surface for a longer distance than 4,000 feet before it enters the underground system.
(2) 
Catch basins shall be located on both sides of the roadway in continuous grades at intervals of not more than 400 feet at all sags in the roadway and near the corners of the roadway at intersecting streets.
C. 
A STORMWATER MANAGEMENT PLAN shall be prepared including and using the following guidelines. NOTE: In preparing the STORMWATER MANAGEMENT PLAN, please refer to and comply with the requirements provided in Chapter 290, Stormwater Management and Erosion Control, of these LAND USE REGULATIONS.
(1) 
No STORMWATER RUNOFF in excess of rates existing prior to new construction shall be allowed to be discharged onto a public way or into a public drainage system unless there is sufficient capacity to handle the additional runoff. All drainage shall be designed to achieve a zero-increase in runoff for both peak and volume where practicable.
(2) 
The direction of flow of runoff through the use of arrows.
(3) 
The location, elevation and size of all catch basins, dry wells, drainage ditches, swales, retention basins and storm sewers. If infiltration systems are proposed as part of a stormwater management plan, test pit and percolation test data in the vicinity of the proposed infiltration system(s) must be provided.
(4) 
Engineering calculations used to determine drainage requirements shall be based upon minimum storm frequency design events as follows:
(a) 
Ten-year storm event for closed drainage systems and local roadside ditches.
(b) 
Twenty-five-year storm event for culverts, major ditches and swales and detention ponds.
(c) 
Fifty-year storm event for bridges.
(5) 
Certification by a licensed professional engineer. (See RSA 310-A.)
(6) 
Any other specific study, calculation or investigation as requested by the Town Engineer.
[NOTE: Generally speaking, the stormwater drainage PLAN is probably the single most important element of the entire SITE PLAN. Yet, traditionally, it has been one of the most neglected elements. The Hudson PLANNING BOARD recognizes that only a professional engineer, licensed in accordance with RSA 310-A, can certify the adequacy of proposed drainage plans. APPLICANTs are expected to make the same recognition or to discuss this matter with the PLANNING BOARD. The PLANNING BOARD emphasizes that the criteria listed in § 289-20C(1) through (6) are minimum requirements stated for these general regulations. It is expected that the Town Engineer shall have the latitude to more precisely define the criteria once a specific proposal is before the PLANNING BOARD.]
A. 
Easements for utilities across LOTs or centered on rear or side LOT lines shall be provided where necessary and shall be at least 15 feet wide, except for watercourses proposed for public control, which shall have a permanent easement of not less than 20 feet.
B. 
Where a SUBDIVISION is traversed by a watercourse, drainageway, channel or stream, the BOARD may require that there be provided a stormwater easement or drainage RIGHT-OF-WAY of adequate width to conform substantially to the lines of such watercourse, drainageway, channel or STREAM and to provide for construction or for other necessary purposes.
Before approval of a SUBDIVISION PLAN, the BOARD shall review said PLAN for open space requirements to consist of parks, playgrounds or permanently reserved open space. The open space shall not be unreasonable in area and generally shall consist of 10% or less of the total area. Open space areas shall be deeded to the TOWN OF HUDSON and shall be so indicated on the final SUBDIVISION PLAN.
Due regard shall be shown for all natural features, such as large trees, watercourses, scenic points, historic spots and similar community assets which, if preserved, shall add attractiveness and value to the SUBDIVISION.
Reserve strips of land which, in the opinion of the BOARD, show an intent on the part of the SUBDIVIDER to control ACCESS to land dedicated or to be dedicated to public use shall not be permitted.
Remnants of lots below usable size left over after subdividing a large tract shall be added to adjacent lots rather than remain as unusable parcels.