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36. Flood Damage Prevention

Idaho County Ordinance Number 36
In Ordinance of the County of Idaho, State of Idaho, Adopting Flood damage prevention Regulations for Areas of Special Flood Hazards; Providing a Statement of Finding of Facts, Statutory Authorization, Purpose and Objectives; Providing for Definitions; Providing for general provisions including establishing application to all areas of special flood hazard within Idaho county excepting areas within Incorporated Cities; Providing what up to the Applications, Review, Issuance and variances; Designating Permit Administrator in Establishing Duties of Permit Administrator; Providing Standards for Flood Hazard Reduction, Including General and Specific Standards for Anchoring, Construction Materials and Methods, Utilities, Subdivisions, Residential Construction, Nonresidential Construction, Manufactured Homes, Recreation Vehicles, Floodways, a Encroachments, Shallow Flooding Areas; Providing That Violations of the Ordinance Shall Be a Misdemeanor; Providing Penalties for Violation of the Ordinance; Providing for Effective Date of the Ordinance.
Be Ordained by the Board of County Commissioners, Idaho County, State of Idaho:
Flood damage prevention ordnance
Section 1.0  Statutory authorization, findings of fact, purpose, and objectives
1.1       statutory authorization
The Legislature of the state of Idaho has in Idaho Code §§ 31-714 and 67-6518 delegated the responsibility to local government units to adopt regulations designed to promote the public health, safety, and general welfare of this citizenry and their property, including building and construction standards.
1.2       FINDINGS OF FACTS
The board of County finds as follows:
[1] The flood hazards area are subject to periodic inundation which results in loss of life and property, health, and safety hazards, disruption of commerce in governmental services, extraordinary public expend pictures for flood protection relief, and impairment of the tax base, al of which adversely affect the public health, safety, and general welfare.
[2] Be flood losses are caused by the cumulative effect of obstructions and areas of special flood hazards which increase flood heights and velocities, and win inadequately incurred, damage uses in other areas. Uses that are inadequately flooded proofed, elevated or otherwise protected from flood damage also contribute to the flood loss.
1.3              STATEMENT OF PURPOSE
It’s is the purpose of this ordinance to promote the public health, safety, and general welfare, and to minimize public and private losses due to put conditions in specific areas by provisions designed:
[1] To protect human life and health;
[2] To minimize expenditure of public money and costly to control projects;
[3] To minimize the need for rescue and relief efforts associated with flooding and generally undertaken at the expense of the general public;
[4] To minimize prolonged business interruption;
[5] To minimize damage to public facilities and utilities such as water and gas mains, electric, telephone and sewer lines, streets, and bridges located in areas of special flood hazard;
[6] To help maintaining stable tax base by providing for the sound use and development of areas of special flood hazard so as to minimize future flood blight areas;
[7] To insure that potential buyers are notified that property is in the area of special flood hazard; and,
[8] To insure that those who occupy the areas of special flood hazard as soon responsibility for their actions.
1.4              METHODS OF REDUCING FLOOD LOSSES
In order to accomplish its purpose, this ordinance includes methods and provisions for:
[1] Restricting or prohibiting use this switch are dangerous to health, safety, and property due to water or erosion hazard, or which results in damaging increases in erosion or flood heights or velocities;
[2] Requiring that uses vulnerable to floods, including facilities which serves such use is, be protected against flood damage at the time of initial construction;
[3] Controlling the alternation of natural flood plaints, stream channels, and natural protective barriers, which help accommodate or channel floodwaters,
[4] Controlling filling, grading, dredging, and other development which may increase blood damage; and
[5] Preventing or regulating the construction of flood barriers which will unnaturally die averts floodwaters or may increase blood hazards in other areas.
SECTIONS 2.0
DEFINITIONS
Unless specifically defined below, words or phrases used in this ordinance shall be interpreted so as to give them the meaning they have in common usage and to give this ordinance its most reasonable application.
“ADMINISTRATOR” means the Board of Idaho County Commissioners, or its designated agent.
“AREA OF SHALLOW FLOODING” means eight designated AO, or AH Zone on the Flood Insurance Rate Map [FIRM]. The base flood depths range from one to 3 feet a clearly defined channel does not exist the path of flooding is unpredictable and in determining and, velocity flow may be evidence. AO is characterized as the flow and AH indicates Ponding.
“AREA OF SPECIAL FLOOD HAZARD” means the land in the floodplain within a community subject to a 1% or greater chance of flooding in any given year. Designation on maps always includes the letters A or V.
“BASE FLOOD” means the flood having a 1% chance of being equaled or exceeded at any given year. Also referred to as a” 100-year flood.” Designation on maps always includes the letters A or V.
“BASEMENT” means any area of the building having its flood subgrade [below ground level] on all sides. Stop
“BOARD” means the Board of Idaho county Commissioners.
“BREAKAWAY WALL” means a wall that is not part of the structural support of the building and is intended through its design and construction to collapse under specific lateral loading forces, without causing damage to the elevated portion of the building or supporting foundation system.
“CRITICAL FACILITY” means facilities for which even a slight chance of flooding might be too great. Critical facilities include, but are not limited to two schools, nursing homes, hospitals, police, fire and emergency response installations, installations which produce, use or store hazardous materials or hazardous waste.
“DEVELOPMENT” means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling, grading, paving, excavation or drilling operations located within the area of special flood hazard.
“ELEVATED BUILDING” means for insurance purposes, a non-basement building which has its lowest elevated floor raised above ground level by foundation walls, shear walls, post, piers, pilings, or columns.
“EXISTING MANUFACTURED HOME PARK OR SUBDIVISION” means a manufactured home Park 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 pad] is completed before the effective date of the adopted floodplain Management regulations.
“EXPANSION TO AN EXISTING MANUFACTURED HOME PARK OR SUBDIVISION”
means the preparation of additional sites by the construction of facilities for serving 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].
“FLOOR “Or “FLOODING” means a general and temporary condition or partial or complete in an inundation of normally dry land areas from:
[1] The overflow of inland or tidal waters and/or
[2] The unusual and rapid accumulation of runoff of surface waters from any source.
“FLOOD INSURANCE RATE MAP [FIRM]”means the official map on which Federal Insurance Administration has delineated both the areas of special flood hazards and the risk premium zones applicable to the community.
“FLOOD INSURANCE STUDY” means the official report provided by the Federal Insurance Administration set includes flood profiles, the Flood Boundary-Floodway Map, and the water surface elevation of the base flood.
“FLOODWAY” means the channel of a river or other water course and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one foot.
“LOWEST FLOOR” means the lowest flood of the lowest enclosed area [including basement. An unfinished or flood resisting closure, usable solely for parking of vehicles, building access or storage, and an area other than a basement area, is not considered a building’s lowest flood, provided that such enclosure is not built so as to render the structure in violation of the applicable non-elevation design requirements of this ordinance found at Section 5.2-1[2].
“MANUFACTURED HOME” means a structure, transportable in one or more sections, which is built on a permanent chassis and is designed for use with or without a permanent foundation when attached to the required utilities. The term “manufactured home” does not include a recreational vehicle.
“MANUFACTURED HOME PARK OR SUBDIVISION” means a parcel [or contiguous parcels] of land divided into two or more manufactured home lots for rent or sale.
“NEW CONSTRUCTION” means structures for which the “star of construction” comment on or after the effective date of this ordinance.
“NEW MANUFACTURED HOME PARK OR 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 effective date of adopted floodplain Management regulations.
“RECREATIONAL VEHICLE” means a vehicle which is
[1]Build on a single chassis;
[2]400 ft. or less when measured at the largest horizontal projection;
[3]Designed to be self propelled or permanently tow-able 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” includes substantial improvement, and means the date the building permit was issued, provided the actual start of construction, repair, reconstruction, 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 slab or footings, the installation of piles, the construction of columns, or any work beyond the State 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 they include excavation for a basement, footings, peers, or foundation or the direction of temporary forms nor do they include the installation of the property or accessory buildings, such as garages or sheds not occupied as dwellings units or not part of the main structure. For substantial improvements, the actual start of construction means the first alteration of any wall, ceiling, floor, or other structural part of the building, whether or not that alteration affects the external dimensions of the building.
“STRUCTURE” means a walled and roofed building including a gas or liquid storage tank that is principally above ground.
“SUBDIVISION” means a subdivision is defined by Idaho County’s subdivision ordinance, Idaho County Ordinance No. 20, adopted May 3, 1983, and as amended.
“SUBSTANTIAL IMPROVEMENT” means any repaid, reconstruction, or improvement of the structure, the cost of which equals or exceeds 50 percent of the market value of the structure either
[1]Before the improvement or repair is started; or
[2] If the structure has been damaged and is being restored, before the damage occurred. For the purposes of this definition “substantial improvement” is considered to occur when the first alternation of any wall, ceiling, floor, or other structural part of the building comments is, whether or not that alternation affects the external dimensions of the structure.
The term does not, however, include either;
[1] any project for improvement of a structure to comply with existing state or local health, sanitary, or safety code specifications which are solely necessary to assure safe living conditions, or
[2] Any alternation of a structure listed on the National Register of Historic Places or a State Inventory of Historic Places.
“Variance” means a grant of relief from the requirements of this ordinance which permits construction in a manner that would otherwise be prohibited by this ordinance.
“WATER DEPENDENT” means a structure for commerce or industry which cannot exist in any other location and is dependent on the water by reason of the intrinsic nature of its operations.
Section 3.0
General Provisions
3.1       LANDS TO WHICH THIS ORDINANCE APPLIES
This ordinance shall apply to all areas of special flood hazards within the jurisdiction of Idaho Canning, State of Idaho, excepting areas of special flood hazard located within the limits of any incorporated city within Idaho County, State of Idaho.
3.2       BASIS FOR ESTABLISHING the areas of special flood hazard
The areas of special flood hazard identify by the Federal Insurance Administration in the scientific and engineering report entitled “The Flood Insurance Studies for Idaho County, Idaho”, as amended, with accompanying Flood Insurance Maps, as amended, are hereby adopted by reference and declared to be part of this ordinance. The Flood Insurance Study is on file at office at the Clerk of Idaho County, 320 W. Main, Grangeville, Idaho.
3.3       PENALTIES FOR NONCOMPLIANCE
No structure or land shall hereafter be constricted, located, extended, converted, or altered without full compliance with the terms of this ordinance and other applicable regulations. Violations of the provisions of this ordinance by failure to comply with any of its requirements including violations of conditions and safeguards establishing in connection with conditions, shall constitute as misdemeanor. Any person who violates this ordinance or fails to comply with any of its requirement shall upon conviction thereof be fined not more than $300.00 or imprisoned for not more than 180 days, or both, for each violation, and in addition shall pay all costs and expenses involved in the case. Nothing herein contained shall prevent Idaho County from taking such other lawful actions as is necessary to prevent or remedy any violation.
3.4       ABROGATION AND GREATER RESTRICTIONS
This ordinance is not intended to repeal, abrogate, or impair any existing easement, covenants, or deed restrictions. However, where this ordinance and another ordinance, easement, covenant, or deed restriction conflict or overlap, whichever imposes the more stringent restrictions shall prevail.
3.5      INTERPRETATION
In the interpretation and application of this ordinance, all provisions shall be:
(1) Considered as minimum requirements;
(2) Liberally constructed in favor of the governing body; and,
(3) Deemed neither to limit or repeal any other powers granted under state statues.
3.6       WARNING AND DISCLAIMER OF LIABILITY
The degree of flood protection required by this ordinance is considered reasonable for regulatory purposes and is based on scientific and engineering considerations. Compliance with the provisions of this ordinance, including construction standards, does not guarantee that no loss or injury will be suffered in the event of a flood. Flood occurrence in severity are dependent on many causes larger floods can and will occur rare occasions. Flood heights, velocity and severity may be increased by man-made or natural causes.
This ordinance is not applied that land outside the areas of special flood hazard or uses permitted  and within such areas will be free from flooding or flood damages. This ordinance shall not create liability on the part of Idaho County, any officer or employee thereof, or the Federal Insurance Administration, for the any flood damages that result from reliance on this ordinance or any administrative decision lawfully made hereunder.
Section 4.0  Administration
4.1       ESTABLISHMENT OF development PERMIT
4.1-1    Development Permit Required
A development permit shall be obtained before construction or development begins within any area a special flood hazard established in Section 3.2. The permit shall be for all structures including manufactured homes, as set forth in the “DEFINITIONS,” and for all development including fill and other activities, also as set forth in the “DEFINITIONS.”
4.1-2    Application for Development Permit
Applications for development permit shall be made on forms furnished by the Board of Idaho County Commissioners and may include but not be limited to plan and duplicate drawn to scale showing the nature, location, dimensions, and elevation of area in question: existing or proposed structures, fill, storage of materials, drainage facilities, and the location of the foregoing. Specifically, the following information is required
[1] Elevation in relation to mean sea level, of the lowest floor (including basement) of all structures:
[2] Elevation in relation to mean sea level to which any structure has been flood proofed;
[3] Certification by a registered professional engineer or architect that the flood proofing methods for any nonresidential structure meet the flood proofing criteria in Section 5.2-2; and
[4] Description of the extent to which a watercourse will be altered or relocated as a result of proposed development.
The applicant shall pay such application and inspection fees as established by the Board of Idaho County Commissioners at the time of the making application.
4.2       DESIGNATION OF ADMINISTRATOR
The board of Idaho County Commissioners, or its designated agent, shall administer and implement this ordinance by grating or denying development permit applications in accordance with its provisions. The Board of Idaho County Commissioners may by resolution designate an agent to act as Administrator for the purpose of this ordinance.
4.3       DUTIES AND RESPONSIBILITIES OF THE ADMINISTRATOR
Duties of administrator shall include, but not be limited to:
4.3-1    Permit Review
(1) Review all development permits to determine that the permit requirement of this ordinance has been set aside.
(2) Review all development permits determine that all necessary permits have been obtained from those Federal, State, or local government agencies from which prior approval is required.
(3) Review all development permits to determine if the proposed development is located in the floodway. Is located in the floodway, sure that the in encroachment provisions of section 5.3(1) are met.
4.3-2    Use of other Base Flood Data
When base flood elevation data has not been provided in accordance with section 3.2, BASIS FOR ESTABLISHING THE AREAS OF SPECIAL FLOOD HAZARD, the Administrator shall obtain, review, and responsibility utilize and any of a flood elevation and floodway data available from a federal, state or other source, in order to administer sections 5.2, SPECIFIC STANDARDS, and 5.3 FLOODWAYS.
4.3-3    Information to the Obtained and Maintained
[1] Where base flood elevation data is provided through the Flood Insurance Study or required as in Section 4.3-2, obtained and record the actual elevation (in relation to mean sea level) of the lowest floor (including basement and all new or substantially improved structures), and whether or not the structure contains the basement
[2] For all new or substantially improved flood proofed structures:
(i) Verify and record the actual elevation (in relation to mean sea level),
(ii) Maintain the flood proofing certifications required in Section 4.1.
[3] Maintained for public inspection and all records pertaining to the provisions of this ordinance.
4.3-4    Alteration of Watercourses
[1] Notify adjacent communities and the Idaho Department of Water Resources, and any other appropriate agencies, prior to any alteration or relocation of a watercourse, and submit evidence of such notification to the Federal Insurance Administration.
[2] Require that maintenance is provided with the altered or relocated portion of said watercourse so that the flood capacity is not diminished.
4.3-5    Interpretation of FIRM Boundaries
Make interpretation where needed, as to exact location of the boundaries is of the areas of special flood hazards (for example, where there appears to be a conflict between a mapped boundary and actual field conditions). Person contesting the location of the boundary shall be given a reasonable opportunity to appeal the instrumentation as provided in Section 4.4.
4.3-6    Issuance/Denial of Permits
If the Administrator is a designated agent of the Board of Idaho County Commissioners, within sixty (60) days of receipt of a completed application complete the review and investigations required under this ordinance and recommend to the Board of County Commissioners that the permit application be granted or denied as appropriate. Upon receipt of the recommendation, and the cab board of Idaho County Commissioners shall be within thirty (30) days:
[1] Grant or deny the permit;
[2] Delay the decision for further study or hearing. In the event of such delay, the Board of Idaho County Commissioners at the time of voting to delay shall establish a definite time period in which a final decision shall be made on the application. In the event of hearing is to be held, the hearing shall be held pursuant to the procedures set forth in Idaho Code § 67-6509.
In the event the Board of Idaho County Commissioners shall not designate an agent to act as Administrator, the Board shall make a decision to grant, deny or delay decision on the permit within sixty (60) days of receipt of a completed application.
4.4       VARIANCE PROCEDURE
4.4-1    General
[1] All requests for variance from the requirements of this ordinance shall be heard and decided by the Board of Idaho County Commissioners following such application, notice and hearing under the procedures set forth for variation under the Idaho County Subdivision Ordinance, Ordinance #20, adopted May third, 1983, and as amended.
[2] In consideration requests for variances, but Board shall consider the application, all technical evaluations and all relevant factors it deems appropriate under the standard specified in this ordinance for granting variances.
[3] The Board may attach such conditions to the granting of variances as it deems necessary to further the purpose of this ordinance.
[4] That Administrator shall maintain the records of all appeal actions and report any variances to the Federal Insurance Administration upon request.
4.4-2    Conditions for Variances
[1]   Generally, the only condition under which a variance from elevation standard may be issued is for new construction and sub standard improvements to be erected on a lot of wine — half acre or lesson size contiguous to and surrounded by lots with existing structures constructed below the
base flood level upon consideration of the relevant factors. As the lot size increases the technical justification required for issuing the variances increases.
[2] Variances may be issued for a reconstruction, rehabilitation, or restoration of structures listed on the National Register of Historic Places or the State Inventory of Historic Places without regard to the procedures set forth in this section.
[3] Variances shall not be issued at a designated floodway of any increase in flood levels during the bases flood discharge would result.
[4] Variances shall only be issued upon a determination that the variance is the minimum necessary, considering the flood hazard, to afford relief.
[5] Variances shall only be issued upon:
(i)           A show aimed of good and significant causes; and
(ii)          A determination that failure to grant the variance would result in all exceptional hardship to the
applicant; and
(iii)         A determination that the granting of a variance will not result in increased flood heights, additional threats to public safety, extra in a public expense, create nuisances, cause fraud on or victimization of the public, or conflict with existing local laws or ordinances.
[6] Variance is as interested in the National Flood Insurance Program are based on a general zoning law principle that they pertain to a physical peace or property; they are not personal in nature and do not pertain to the structure, its inhabitants, economic financial circumstances. Thay primarily address small lots in densely populated residential neighborhoods. As such, variances from the flood valuations should be quite rare.
[7] Variances may be issued for nonresidential buildings and very limited circumstances to allow a lesser degree of flood proofing by watertight or dry-flood proofing, where it can be determined that such action will give low damage potential, complies with all other variance criterial except 4.4-2(1), and otherwise, complies with Section 5.1-1 and 5.1-2 of the GENERAL STANDARDS.
[8] Any applicant to whom a variance is granted shall be given written notice that the structure will be permitted to be built with the lowest floor elevation below the base flood of elevation and the cost of flood insurance will be commensurate with the increased risk resulting from the reduced lowest floor elevation.
Section 5.0    PROVISIONS FOR FLOOD HAZARD REDUCTION
5.1 GENERAL STANDARDS
In all areas of special flood hazards, the following standards are required
5.1-1 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 must likewise be anchored to prevent flotation, collapse or lateral movement and shall be installed using methods and practices that minimize flood damage. Anchoring methods may include, but are not limited to, use of over the top or frame ties to ground anchors (reference FEMA’s “Manufactured Home Installation in Flood Hazard Areas” Guidelines for additional techniques).
5.1-2 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] Electrical, heating, ventilation, plumbing, and air-conditioning equipment and other service facilities shall be designed and/or otherwise elevated or located so as to prevent water form entering or accumulating within the components during conditions of flooding.
5.1-3 Utilities
[1] All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system;
[2] New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharge from the systems into flood waters; and,
[3] On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
5.1-4 Subdivision Proposal
In addition to all requirements and conditions established in Idaho County’s Subdivision ordinance, as amended:
[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; and,
[4] Where base flood elevation data has not been provided or is not available from another authoritative source, it shall be generated for subdivision proposals and other proposed developments which contain at least 50 lots or 5 acres (whichever is less).
5.1-5 Review of building Permits
Where elevation data is not available either through the Flood Insurance Study or from another authoritative source (Section 4.3-2) application for building permits shall be reviewed to assure the proposed construction will be reasonably safe from flooding. The test of reasonableness is a local judgment and includes use of historical data, high water marks, photographs of past flooding, etc., where available. Failure to elevate at least two feet above grade in these zones may result in higher insurances rates.
(i)   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.
(ii)  The bottom of all openings shall be no higher than one foot above grade.
(ii)  Openings may be equipped with screens, louvers, or other coverings or devices
provided that they permit the automatic entry and exit of floodwaters.
5.2-2 Nonresidential Construction
New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated one foot above the base flood elevation; or, together with attendant utility and sanitary facilities, shall:
[1] Be flood proofed so that below one foot above 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 design and methods of construction are in accordance with accepted standards of practice for meeting provisions of this subsection based on their development and/or review of the structural design, specifications and plans. Such certifications shall be provided to the official as set forth in Section 4.3-3;
[4] Nonresidential structures that are elevated, not flood proofed, must meet the same standards for space below the lowest floor as described in 5.2-1;
[5] Applicants flood proofing nonresidential buildings shall be notified that flood insurance premiums will be based on rates that are one food below the flood proofed level (e.g. a building flood proofed to the base flood level will be rated as one foot below).
5.2-3 Manufactured homes
[1] All manufactured homes to be placed or substantially improved within Zones A1-A30, AH, and AE on the community’s FIRM on sites:
(i) Outside of a manufactured home park or subdivision,
(ii) In a new manufactured home park or subdivision,
(iii) In an expansion to an existing manufactured home park or subdivision, or
(iv) 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 one foot above the base flood elevation and be securely anchored to an adequately designed foundation systems 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 within Zones Al-30, AH, and AE on the community’s FIRM that are not subject to the above manufactured home provisions be elevated so that either:
(i) The lowest floor of the manufactured home is elevated one foot above the
base flood elevation, or
(ii) 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 designed foundation system to resist flotation, collapse, and lateral movement.
5.2-4 Recreational Vehicles
Recreational vehicles placed on sites within Zones Al-30, AH, and AE on the community’s FIRM either must:
(i) Be on site for fewer than 180 consecutive days, or
(ii) Be fully licensed and ready for highway use, 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; or
(iii) Meet the requirements of 5.2-3 above and the elevation and anchoring requirements for manufactured homes.
5.3 FLOODWAYS
Located within areas of special flood hazard established in Section 3.2 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
[1] Prohibit encroachments, including fill, new construction, substantial improvements, and other development unless certification by a registered professional engineer is provided demonstrating that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge.
[2] If Section 5.3(1) is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Section 5.0, PROVISIONS FOR FLOOD HAZARD REDUCTION.
5.4 ENCROACHMENTS
The cumulative effect of any proposed development, where combined with all other existing and anticipated development, shall not increase the water surface elevation of the base flood more than one foot at any point.
5.5 STANDARDS FOR SHALLOW FLOODING AREAS (AO ZONES)
Shallow flooding areas appear on FIRMs as AO zones with depth designation. The base flood depths in these zones range from 1 to 3 feet above ground where a clearly defined channel does not exist, or where the path of flooding is unpredictable and where velocity flow may be evident. Such flooding is usually characterized as sheet flow. In these areas, the following provisions apply:
[1] New construction and substantial improvements of residential structures and manufactured homes within AO zones shall have the lowest floor (including basement) elevated above the highest grade adjacent to the building, one foot or more above the depth number specified on the FIRM (at lease two feet is no depth number is specified).
[2] New construction and substantial improvements of nonresidential structures within AO zones shall either:
(i) Have the lowest flood (including basement) elevated above the highest adjacent grade of the building site, one foot or more above the depth number specified on the FIRM (at least two feet if no depth number is specified); or
(ii) Together with attendant utility and sanitary facilities, be completely flood proofed to or above the level so that any space below that level is watertight with wall substantial impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. If this method is used, compliance shall be certified by a registered professional engineer or architect as in section 5.2-2.
[3] Require adequate drainage paths around structures on slopes to guide floodwaters around and away from proposed structures.
[4] Recreational vehicles placed on sites within AO Zones on the community’s FIRM either must:
(i) Be on the site for fewer than 180 consecutive days, or
(ii) Be fully licensed and ready for highway use, 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; or
(iii) Meet the requirements of 5.5 above and the elevation and anchoring requirements for manufactured homes.
SECTION 6
This ordinance shall be effective upon passage and date of first publication in the Idaho County Free Press pursuant to Idaho Code §31-715.
EFFECTIVE DATE :
This ordinance is hereby adopted and passed on this 14 day of April 1997.
BOARD OF IDAHO COUNTY COMMISSIONERS:
George Enneking – Chairman
Pat Long – Member
Harry Owens – Member
Rose Gehring – Idaho County Clerk

 

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