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Amherst City Zoning Code

ARTICLE V

- FLOODPLAINS

Sec. 24-294. - Definitions.

The following words, terms and phrases, when used in this article, shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning:

Base flood/100-year flood means a flood that, on the average, is likely to occur once every 100 years (i.e., that has a one percent chance of occurring each year, although the flood may occur in any year).

Board of zoning appeals means the board appointed to review appeals made by individuals with regard to decisions of the zoning administrator in the interpretation of this chapter.

Development means any manmade change to improved or unimproved real estate, including, but not limited to, buildings and other structures, the placement of manufactured homes, streets, and other paving, utilities, filling, grading, excavation, mining, dredging, drilling operation, or storage of equipment or materials.

Existing manufactured home park/subdivision means a manufactured home park or subdivision for which the construction of facilities for servicing the lots on which the manufactured homes are to be affixed (including, at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed before the initial effective date of these regulations.

Expansion to an existing manufactured home park or subdivision means the preparation of additional sites by the construction of facilities for servicing the lots on which the manufactured homes are to be affixed (including the installation of utilities, the construction of streets and either final site grading or the pouring of concrete pads).

Flood means a general and temporary inundation of normally dry land areas.

Floodplain means:

(1)

A relatively flat or low land area adjoining a river, stream or watercourse which is subject to partial or complete inundation;

(2)

An area subject to the usual and rapid accumulation or runoff of surface water from any source.

Floodprone area means any land area susceptible to being inundated by water from any source.

Floodway means the designated area of the floodplain required to carry and discharge floodwaters of a given magnitude. For the purposes of this chapter, the floodway shall be capable of accommodating a flood of the 100-year magnitude.

Historic structure means any structure that is:

(1)

Listed individually in the National Register of Historic Places (a listing maintained by the Department of Interior) or preliminarily determined by the Secretary of the Interior as meeting the requirements for individual listing on the National Register;

(2)

Certified or preliminarily determined by the Secretary of the Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined by the Secretary to qualify as a registered historical district;

(3)

Individually listed on a state inventory of historic places in states with historic preservation programs which have been approved by the Secretary of the Interior; or

(4)

Individually listed on a local inventory of historic places in communities with historic preservation programs that have been certified either:

a.

By an approved state program as determined by the Secretary of the Interior; or

b.

Directly by the Secretary of the Interior in states without approved programs.

Manufactured home means the same as the meaning described in the definitions section of this chapter.

Manufactured home park/subdivision means a parcel (or contiguous parcels) of land divided into two or more lots for rent or sale.

New construction, for the purpose of determining insurance rates, means structures for which the start of construction commenced on or after the effective of an initial FIRM (flood insurance rate map) or after December 31, 1974, whichever is later, and includes any subsequent improvements to such structures. For floodplain management purposes, the term "new construction" means structures for which the start of construction commenced on or after the effective date of a floodplain management regulation adopted by a community and includes any subsequent improvements to such structures.

New manufactured home park/subdivision means a manufactured home park or subdivision for which the construction of facilities for servicing the lots on which the manufactured homes are to be affixed (including, at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed on or after the initial effective date of the ordinance from which this chapter is derived.

Recreational vehicle means a vehicle which is:

(1)

Built on a single chassis;

(2)

Four hundred square feet or less when measured at the largest horizontal projection;

(3)

Designed to be self-propelled or permanently towable by a light-duty truck; and

(4)

Designed primarily not for use as a permanent dwelling but as temporary living quarters for recreational camping, travel, or seasonal use.

Start of construction means the date the building permit was issued, provided the actual start of construction, repair, reconstruction, rehabilitation, addition, placement, or other improvement was within 180 days of the permit date. The actual start means either the first placement of permanent construction of a structure on a site, such as the pouring of a slab or footings, the installation of piles, the construction of columns, or any work beyond the stage of excavation; or the placement of a manufactured home on a foundation. Permanent construction does not include land preparation, such as clearing, grading and filling; nor does it include the installation of streets and/or walkways; nor does it include excavation for a basement, footings, piers, or foundations or the erection of temporary forms; nor does it include the installation on the property of accessory buildings, such as garages or sheds not occupied as dwelling units or not part of the main structure. For a substantial improvement, the actual start of construction means the first alteration on any wall, ceiling, floor, or other structural part of a building, whether or not the alteration affects the external dimensions of the building.

Substantial damage means damage of any origin sustained by a structure whereby the cost of restoring the structure to its before-damaged condition would equal or exceed 50 percent of the market value of the structure before the damage occurred.

Substantial improvement means:

(1)

Any reconstruction, rehabilitation, addition, or other improvement of a structure, the cost of which equals or exceeds 50 percent of the market value of the structure before the start of construction of the improvement. The term "substantial improvement" includes structures which have incurred substantial damage regardless of the actual repair work performed.

(2)

The term "substantial improvement" does not, however, include either:

a.

Any project for improvement of a structure to correct existing violations of state or local health, sanitary, or safety code specifications which have been identified by the local code enforcement official and which are the minimum necessary to ensure safe living conditions; or

b.

Any alteration of an historic structure, provided that the alteration will not preclude the structures continued designation as an historic structure.

(Zoning Ord. 2003, § 18.1-915.2)

Sec. 24-295. - Purpose.

The purpose of these provisions is to prevent the loss of life and property, the creation of health and safety hazards, the disruption of commerce and governmental services, the extraordinary and unnecessary expenditure of public funds for flood protection and relief, and the impairment of the tax base by:

(1)

Regulating uses, activities, and development which, alone or in combination with other existing or future uses, activities, and development, will cause unacceptable increases in flood heights, velocities, and frequencies.

(2)

Restricting or prohibiting certain uses, activities, and development from locating within districts subject to flooding.

(3)

Requiring all those uses, activities, and developments that do occur in floodprone districts to be protected and/or floodproofed against flooding and flood damage.

(4)

Protecting individuals from buying land and structures which are unsuited for intended purposes because of flood hazards.

(Zoning Ord. 2003, § 18.1-915.1.1)

Sec. 24-296. - Applicability.

These provisions shall apply to all lands within the jurisdiction of the town and identified as being in the 100-year floodplain by the Federal Insurance Administration.

(Zoning Ord. 2003, § 18.1-915.1.2)

Sec. 24-297. - Compliance and liability.

(a)

No land shall hereafter be developed, and no structure shall be relocated, constructed, reconstructed, enlarged, or structurally altered except in full compliance with the terms and provisions of this chapter and any other applicable ordinances and regulations which apply to uses within the jurisdiction of this chapter.

(b)

The degree of flood protection sought by the provisions of this chapter is considered reasonable for regulatory purposes and is based on accepted engineering methods of study. Larger floods may occur on rare occasions. Flood heights may be increased by manmade or natural causes, such as ice jams and bridge openings restricted by debris. This chapter does not imply that districts outside the floodplain district, or that land uses permitted within such district will be free from flooding or flood damages.

(c)

This chapter shall not create liability on the part of the town or any officer or employee thereof for any flood damages that result from reliance on this chapter, or any administrative decision lawfully made thereunder.

(Zoning Ord. 2003, § 18.1-915.1.3)

Sec. 24-298. - Abrogation and greater restrictions.

This chapter supersedes any ordinance currently in effect in floodprone districts. However, any underlying ordinance shall remain in full force and effect to the extent that its provisions are more restrictive than this chapter.

(Zoning Ord. 2003, § 18.1-915.1.4)

Sec. 24-299. - Penalties.

(a)

Any person who fails to comply with any of the requirements or provisions of this chapter or directions of the zoning officer or any other authorized employee of the town shall be guilty of a Class 1 misdemeanor and subject to the penalties therefor.

(b)

In addition to the above penalties, all other actions are hereby reserved, including an action in equity for the proper enforcement of this chapter. The imposition of fine or penalty for any violation of, or noncompliance with, this chapter shall not excuse the violation or noncompliance to permit it to continue; and all such persons shall be required to correct or remedy such violations or noncompliance within a reasonable time. Any structure constructed, reconstructed, enlarged, altered, or relocated in noncompliance with this chapter may be declared by the town council to be a public nuisance and abatable as such. Flood insurance may be withheld from structures constructed in violation of this chapter.

(Zoning Ord. 2003, § 18.1-915.1.6)

Sec. 24-300. - Variances; factors to be considered.

In passing upon applications for variances, the board of zoning appeals shall satisfy all relevant factors and procedures specified in other sections of the zoning ordinance and consider the following additional factors:

(1)

The danger to life and property due to increased flood heights or velocities caused by encroachments. No variance shall be granted for any proposed use, development, or activity within any floodway district that will cause any increase in the 100-year flood elevation.

(2)

The danger that materials may be swept on to other lands or downstream to the injury to others.

(3)

The proposed water supply and sanitation systems and the ability of these systems to prevent disease, contamination, and unsanitary conditions.

(4)

The susceptibility of the proposed facility and its contents to flood damage and the effect of such damage on the individual owners.

(5)

The importance of the services provided by the proposed facility to the community.

(6)

The requirements of the facility for a waterfront location.

(7)

The availability of alternative locations not subject to flooding for the proposed use.

(8)

The compatibility of the proposed use with existing development and development anticipated in the foreseeable future.

(9)

The relationship of the proposed use to the comprehensive plan and floodplain management program for the area.

(10)

The safety of access by ordinary and emergency vehicles to the property in time of flood.

(11)

The expected heights, velocity, duration, rate of rise, and sediment transport of the floodwaters expected at the site.

(12)

The repair or rehabilitation of historic structures upon a determination that the proposed repair or rehabilitation will not preclude the structure's continued designation as a historic structure and variance is the minimum necessary to preserve the historic character and design of the structure.

(13)

Such other factors which are relevant to the purposes of this chapter.

a.

The board of zoning appeals may refer any application and accompanying documentation pertaining to any request for a variance to any engineer or other qualified person or agency for technical assistance in evaluating the proposed project in relation to flood heights and velocities, and the adequacy of the plans for flood protection and other related matters.

b.

Variances shall be issued only after the board of zoning appeals has determined that the granting of such will not result in unacceptable or prohibited increases in flood heights, additional threats to public safety, extraordinary public expense, and will not create nuisances, cause fraud or victimization of the public, or conflict with local laws or ordinances.

c.

Variances shall be issued only after the board of zoning appeals has determined that variance will be the minimum required to provide relief from any exceptional hardship to the applicant.

d.

The board of zoning appeals shall notify the applicant for a variance, in writing, that the issuance of a variance to construct a structure below the 100-year flood elevation increases the risks to life and property and will result in increased premium rates for flood insurance.

e.

A record shall be maintained of the above notification as well as all variance actions, including justification for the issuance of the variances. Any variances which are issued shall be noted in the annual or biennial report submitted to the Federal Insurance Administrator.

(Zoning Ord. 2003, § 18.1-915.5)

Sec. 24-301. - Existing structures in floodplain districts.

The substantial damage or improvement of any structure shall require full compliance with the provisions of this article.

(Zoning Ord. 2003, § 18.1-915.6)

Sec. 24-321. - Description of floodplain districts.

(a)

Basis of districts. The various floodplain districts shall include areas subject to inundation by waters of the 100-year flood. The basis for the delineation of these districts shall be the flood insurance study for the town prepared by the Federal Emergency Management Agency, Federal Insurance Administration, dated September 19, 2007, as amended.

(1)

The floodway district is delineated, for purposes of this chapter, using the criterion that certain areas within the floodplain must be capable of carrying the waters of the 100-year flood without increasing the water surface elevation of that flood more than one foot at any point. The areas included in this district are specifically defined in table II of the above-referenced flood insurance study and shown on the accompanying flood boundary and floodway map or flood insurance rate map.

(2)

The flood-fringe district shall be that area of the 100-year floodplain not included in the floodway district. The basis for the outermost boundary of the district shall be the 100-year flood elevations contained in the flood profiles of the above-referenced flood insurance study and as shown on the accompanying flood boundary and floodway map or flood insurance rate map.

(3)

The special floodplain district shall be that floodplain area for which base flood elevations have been provided in the FIS and FIRM but for which no floodway has been delineated. Such areas are shown as Zone AE on the maps accompanying the FIS.

(4)

The approximated floodplain district shall be that floodplain area for which no delineated flood profiles or elevations are provided, but where the 100-year floodplain boundary has been approximated. Such areas are shown as Zone A on the maps accompanying the flood insurance study. For these areas, the 100-year flood elevations and floodway information from other federal, state, or other acceptable source shall be used, when available. When such other acceptable information is not available, the elevation shall be determined by using the elevation of a point on the boundary of the identified floodplain area which is nearest to the construction site.

(b)

Overlay concept.

(1)

The floodplain districts described above shall be overlays to the existing underlying districts as shown on the official zoning ordinance map, and as such, the provisions for the floodplain districts shall serve as a supplement to the underlying district provisions.

(2)

Any conflict between the provisions or requirements of the floodplain districts and those of any underlying district, the more restrictive provisions and/or those pertaining to the floodplain districts shall apply.

(3)

In the event any provisions concerning a floodplain district is declared inapplicable as a result of any legislative or administrative actions or judicial decision, the basic underlying provisions shall remain applicable.

(Zoning Ord. 2003, § 18.1-915.3.1)

Sec. 24-322. - Official zoning map.

The boundaries of the floodplain districts are established as shown on the flood insurance rate map which is declared to be part of this chapter, and which shall be kept on file at the town offices.

(Zoning Ord. 2003, § 18.1-915.3.2)

Sec. 24-323. - District boundary changes.

The delineation of any of the floodplain districts may be revised by the town council where natural or manmade changes have occurred and/or where more detailed studies have been conducted or undertaken by the U.S. Army Corps of Engineers or other qualified agency, or an individual documents the need for such change. However, prior to any such change, approval must be obtained from the Federal Insurance Administration.

(Zoning Ord. 2003, § 18.1-915.3.3)

Sec. 24-324. - Interpretation of district boundaries.

Initial interpretation of the boundaries of the floodplain districts shall be made by the zoning officer. Should a dispute arise concerning the boundaries of any of the districts, the board of zoning appeals shall make the necessary determination. The person questioning or contesting the location of the district boundary shall be given a reasonable opportunity to present his case to the board and to submit his own technical evidence if he so desires.

(Zoning Ord. 2003, § 18.1-915.3.4)

Sec. 24-352. - General provisions.

(a)

Permit requirement. All uses, activities, and development occurring within any floodplain district shall be undertaken only upon the issuance of a zoning permit. Such development shall be undertaken only in strict compliance with the provisions of the ordinance and with all other applicable codes and ordinances, such as the uniform statewide building code and the town subdivision regulations. Prior to the issuance of any such permit, the zoning officer shall require all applications to include compliance with all applicable state and federal laws. Under no circumstances shall any use, activity, and/or development adversely affect the capacity of the channels or floodways of any watercourse, drainage ditch, or any other drainage facility or system.

(b)

Alteration or relocation of watercourses. Prior to any proposed alteration or relocation of any channels or of any watercourse, stream, etc., within this jurisdiction a permit shall be obtained from the U.S. Corps of Engineers, the state water control board, the state marine resources commission (a joint permit application is available from any of these organizations). Furthermore, notification of the proposal shall be given by the applicant to all affected adjacent jurisdictions, the division of soil and water conservation (department of conservation and recreation), and the Federal Insurance Administration.

(c)

Site plans and permit applications. All applications for development in the floodplain district and all building permits issued for the floodplain shall incorporate the following information:

(1)

For structures to be elevated, the elevation of the lowest floor (including basement).

(2)

For structures to be floodproofed (nonresidential only), the elevation to which the structure will be floodproofed.

(3)

The elevation of the 100-year flood.

(4)

Topographic information showing existing and proposed ground elevation.

(d)

Manufactured homes.

(1)

Manufactured homes that are placed or substantially improved 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 the result of a flood;

shall 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.

(2)

Manufactured homes to be placed or substantially improved on sites in an existing manufactured home park or subdivision that are not subject to the provisions of paragraph one above shall 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.

(e)

Recreational vehicles. Recreational vehicles placed on sites shall either:

(1)

Be on the site for fewer than 180 consecutive days;

(2)

Be fully licensed and ready for highway use;

(3)

Meet the permit requirements for placement and the elevation and anchoring requirements for manufactured homes in subsection (d)(1)d of this section.

(Zoning Ord. 2003, § 18.1-915.4.1)

Sec. 24-353. - Floodway district.

In the floodway district no encroachments, including fill, new construction, substantial improvements, or other development shall be permitted unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice that the proposed encroachment would not result in any increase in the 100-year flood elevation.

(Zoning Ord. 2003, § 18.1-915.4.2)

Sec. 24-354. - Flood-fringe, special floodplain and approximated floodplain districts.

(a)

In the flood-fringe, special floodplain and approximated floodplain districts the development and/or use of land shall be permitted in accordance with the regulations of the underlying district, provided that all such uses, activities, and/or development shall be undertaken in strict compliance with the floodproofing, and related provisions contained in the uniform statewide building code and all other applicable codes and ordinances.

(b)

Standards for the special floodplain district. Until a regulatory floodway is designated, no new construction, substantial improvements, or other development (including fill) shall be permitted within the areas of special floodplain district, designated as zones AE on the flood rate insurance map, unless it is demonstrated that the cumulative effect of the proposed development, when combined with all other existing and anticipated development will not increase the water surface elevation of the base flood more than one foot at any point within the town.

(Zoning Ord. 2003, § 18.1-915.4.3)

Sec. 24-355. - Decision criteria for utilities and facilities.

(a)

Sanitary sewer facilities. All new or replacement sanitary sewer facilities and private package sewage treatment plants (including all pumping stations and collector systems) shall be designed to minimize or eliminate infiltration of floodwaters into the systems and discharges from the systems into the floodwaters. In addition, they should be located and constructed to minimize or eliminate flood damage and impairment.

(b)

Water facilities. All new or replacement water facilities shall be designed to minimize or eliminate infiltration of floodwaters into the system and be located and constructed to minimize or eliminate flood damages.

(c)

Drainage facilities. All storm drainage facilities shall be designed to convey the flow of surface waters without damage to persons or property. The systems shall ensure drainage away from buildings and on-site waste disposal sites. The town council may require a primarily underground system to accommodate frequent floods and a secondary surface system to accommodate larger, less frequent floods. Drainage plans shall be consistent with local and regional drainage plans. The facilities shall be consistent with local and regional drainage plans. The facilities shall be designed to prevent the discharge of excess runoff onto adjacent properties.

(d)

Utilities. All utilities such as gas lines, electrical and telephone systems being placed in floodprone areas should be located, elevated (where possible), and constructed to minimize the chance of impairment during a flooding occurrence.

(e)

Streets and sidewalks. Streets and sidewalks should be designed to minimize their potential for increasing and aggravating the levels of flood flow. Drainage openings shall be required to sufficiently discharge flood flows without unduly increasing flood heights.

(Zoning Ord. 2003, § 18.1-915.4.4)