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City of Lebanon, NH
Grafton County
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Table of Contents
Code
New Laws (5) Index
Public Documents
Zoning Ordinance (6)
In all areas of special flood hazards the following standards are required:
A. 
Anchoring.
(1) 
All new construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure.
(2) 
All manufactured homes that are placed or substantially improved within special flood hazard areas on the community's FIRM on sites:
(a) 
Outside of a manufactured home park or subdivision;
(b) 
In a new manufactured home park or subdivision;
(c) 
In an expansion to an existing manufactured home park or subdivision; or
(d) 
In an existing manufactured home park or subdivision on which a manufactured home has incurred substantial damage as a result of a flood, be elevated on a permanent foundation such that the lowest floor of the manufactured home is elevated to or above the base flood elevation and be securely anchored to an adequately anchored foundation system to resist flotation, collapse and lateral movement.
(3) 
All manufactured homes to be placed or substantially improved on sites in an existing manufactured home park or subdivision within special flood hazard areas on the community's FIRM that are not subject to the provisions of § 74-20A(2) be elevated so that either:
(a) 
The lowest floor of the manufactured home is at or above the base flood elevation; or
(b) 
The manufactured home chassis is supported by reinforced piers or other foundation elements of at least equivalent strength that are no less than 36 inches in height above grade and be securely anchored to an adequately anchored foundation system to resist flotation, collapse and lateral movement.
(4) 
Recreational vehicles.
(a) 
All recreational vehicles placed on sites within Zone AE shall either:
[1] 
Be on the site for fewer than 180 consecutive days;
[2] 
Be fully licensed and ready for highway use; or
[3] 
Meet all standards of Section 60.3(b)(1) of the National Flood Insurance Program Regulations and the elevation and anchoring requirements for manufactured homes in Paragraph (c)(6) of Section 60.3.
(b) 
A recreational vehicle is ready for highway use if it is on its wheels or jacking system, is attached to the site only by quick-disconnect type utilities and security devices and has no permanently attached additions.
B. 
Construction materials and methods.
(1) 
All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.
(2) 
All new construction and substantial improvements shall be constructed using methods and practices that minimize flood damage.
(3) 
All new construction or substantial improvements shall have electrical, heating, ventilation, plumbing and air-conditioning equipment and other service facilities that are designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding.
C. 
Utilities.
(1) 
All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the system.
(2) 
New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems and discharge from the systems into floodwaters.
(3) 
On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
D. 
Subdivision proposals.
(1) 
All subdivision proposals shall be consistent with the need to minimize flood damage.
(2) 
All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage.
(3) 
All subdivision proposals shall have adequate drainage provided to reduce exposure to flood damage.
(4) 
Base flood elevation data shall be provided for subdivision proposals and other proposed development which contain at least 50 lots or five acres (whichever is less).
(5) 
Residential subdivisions shall not be approved unless the applicant can demonstrate that lands sufficient to meet the lot area, frontage and yard requirements of the Zoning Ordinance[1] exist on each proposed lot in areas outside the special flood hazard area.
[1]
Editor's Note: The Zoning Ordinance is on file in the city offices.
In all areas of special flood hazards where base flood elevation data has been provided as set forth in § 74-8, Basis for establishing the areas of special flood hazard, or § 74-16B, Use of other base flood data, the following provisions are required.
A. 
Residential construction. New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to or above base flood elevation.
[Amended 7-10-2019 by Ord. No. 2019-08]
B. 
Nonresidential construction. New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated to the level of the base flood elevation or, together with attendant utility and sanitary facilities, shall:
(1) 
Be floodproofed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water.
(2) 
Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy.
(3) 
Be certified by a registered professional engineer or architect that the standards of this subsection are satisfied. Such certifications shall be provided to the official set forth in § 74-16D.
C. 
Residential and nonresidential construction. For all new construction and substantial improvements, fully enclosed areas below the lowest floor that are subject to flooding are permitted, provided that the enclosed areas meet the following requirements:
(1) 
The enclosed area is unfinished or flood resistant, used solely for parking of vehicles, building access or storage.
(2) 
The area is not a basement.
(3) 
Shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwater. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or must meet or exceed the following minimum criteria: A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers or other coverings or devices, provided that they permit the automatic entry and exit of floodwater.
Located within areas of special flood hazard established in § 74-8 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles and erosion potential, the following provisions apply:
A. 
Prohibit encroachments, including fill, new construction, substantial improvements and other development unless certification by a registered professional engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge.
B. 
If Subsection A is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Article V, Provisions for Flood Hazard Reduction.
C. 
Prohibit the placement of manufactured homes.