Section 1.0 Title
Section 2.0 Interpretation and Application
Section 3.0 Regulations - Floodway District FW
Section 4.0 Regulations - Flood Fringe District FF
Section 5.0 Regulations - Flood Prone Areas
Section 6.0 Administration
Section 7.0 Definitions
Section 8.0 Enactment
1.1 Short Title. This resolution shall hereafter be referred to as the Larimer County Flood Plain Building Code.
2.1 Whenever possible, the provisions of this supplementary building code shall be interpreted to apply together with an in conjunction with other Larimer County Building Codes. This Amendment is not to be interpreted as a repeal of prior building codes, but rather, regulations to apply in addition to other building codes.
2.2 Except as specifically provided in this Amendment, all other provisions of the Larimer County Building Code shall continue to be applied in addition to the requirements set forth herein.
2.3 This amendment to the Larimer County Building Code shall apply in those areas of the County zoned either FW-Floodway or FF-Flood fringe.
2.4 Zoning map. The boundaries and zoning classifications of the districts herein referenced are as shown on the official zoning maps for the areas within Larimer County as adopted or amended after public hearings by the Board of County Commissioners of Larimer County. Such maps and of this resolution.
3.1 Use of fill. Fill shall not be permitted in the FW District except when such fill, acting along or in combination with existing or future flood plain uses shall be shown to have no detrimental effect upon the hydraulic capacity of the floodway. In the event fill is permitted, it shall be protected against erosion where erosive velocities may occur by the use of riprap, bulkheading, or vegetative cover.
3.2 Structures. Where structures are allowed by the Larimer County Comprehensive Zoning Resolution, the following restrictions shall apply:
4.1 Fill. The use of fill in the FF District shall be the minimum necessary to comply with the provisions of this regulation. When required by the provisions of the Larimer County Comprehensive Zoning Resolution, fill in the FF District shall be to a point no lower than the elevation at least fifteen feet beyond the extremities of any structure erected on such fill. No fill shall be used in such a manner as to restrict the flow capacity of any tributary or other drainway to the main stream.
4.3 Require that all manufactured homes to be placed or substantially improved within the flood plain on the Larimer County's FIRM be elevated on a permanent foundation such that the lowest floor of the manufactured home is at or above the base flood elevation; and be securely anchored to an adequately anchored foundation system and all manufactured homes shall be installed using methods and practices which minimize flood damage. For the purposes of this requirement, manufactured homes must be elevated and anchored to resist flotation, collapse, or lateral movement. Methods of anchoring may include, but are not to be limited to, use of over- the-top or frame ties to ground anchors. This requirement is in addition to other applicable State and local anchoring requirements for resisting wind forces.
5.1 If a proposed building site is in a flood-prone area, all new construction and substantial improvements including the placement of prefabricated buildings and manufactured homes shall (i) be designed (or modified) and adequately anchored to prevent flotation, collapse, or lateral movement of the structure, (ii) be constructed with materials and utility equipment resistant to flood damage, and (iii) be constructed by methods and practices that eliminate flood damage.
5.2 All manufactured homes to be placed within flood-prone areas shall be anchored to resist flotation, collapse, or lateral movement by providing over-the-top and frame ties to ground anchors. Specific requirements shall include (i) over-the-top ties at each of the four corners of homes less than 50 feet long as well as one additional tie per side at intermediate locations; (ii) frame ties at each corner of the home with five additional ties per side at the intermediate points and manufactured homes less than fifty feet long to have four additional ties per side. All components of the anchoring system shall be capable to carrying a force of 4,800 pounds; and any additions to the manufactured home shall be similarly anchored.
5.3 All manufactured homes or those to be substantially improved shall conform to the Larimer County Mobile Home Resolution and to the following requirements:
5.4 Recreational vehicles
6.1 Application procedure. Applications for building permits in the FF and FW Zoning District shall be accompanied by surveys, plot plans, drawings, plans, and other materials as necessary showing compliance of the proposed construction with the provisions of this resolution and the flood plain supplementary zoning resolution. Such submittals may include the following as necessary and shall be prepared by a registered professional engineer or architect:
6.2 Flood-proofing measures taken pursuant hereto, shall be designed consistent with the flood protection elevation for the particular area, flood velocities, duration's, rate of rise, hydrostatic and hydrodynamic forces, and other factors associated with the regulatory flood. The building department shall require that the applicant submit a plan or document certified by a registered professional engineer or architect that the flood-proofing measures are consistent with regulatory flood-protection elevation and associated flood factors for a particular area. The following flood- proofing measures may be required or taken in connection with specific construction. Such measures shall be undertaken in a manner consistent with requirements detailed by flood proofing regulations as published by the U.S. Army Corps of Engineers.
6.3 Board of Review. There shall be a Board of Review appointed by the Board of County Commissioners consisting of three members and one alternate. Terms shall be for two years. Such Board of Review shall have the qualifications and powers designated in Colorado Revised Statutes, 1973, 30-28-206 as amended. In addition, all members of the Board of Review shall be trained and experienced in technical matters relative to flood control and protection specified herein. The alternate may vote only upon the absence of one of the regular members.
6.4 Appeals to the Board of Review may be taken by any person aggrieved by his inability to obtain a building permit in the FW or FF zones or by any officer, department, board, or bureau of the County. Upon review, the Board of Review shall have jurisdiction only over the following matters:
As amended March 4,1996
7.1 Appeal - A request for a review of the Flood Plain Administrator's interpretation of any provisions of this ordinance or a request for a variance.
7.2 Area of Special Flood Hazard - The land in the flood plain within a community subject to a one percent or greater change of flooding in any given year.
7.3 Base Flood - The flood having a one percent change of being equaled or exceeded in any given year.
7.4 Channel - A natural or artificial watercourse or drainway of perceptible extent with definite bed and banks to confine and conduct continuously or periodically flowing water.
7.5 Development - 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.
7.6 Drainway - A natural or artificial land surface depression with or without perceptibly defined beds and banks to which surface runoff gravitates and collectively forms a flow of water continuously or intermittently in a definite direction.
7.7 Existing Manufactured Home Park or subdivision - A manufactured home park 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) are completed before the effective date of this ordinance.
7.8 Expansion to 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.)
7.9 Fill - A deposit of materials or any kind placed by artificial means.
As amended March 4, 1996
7.10 Flood or Flooding - A general and temporary condition of partial or complete inundation or normally dry land areas from:
1. The overflow of inland or tidal waters and/or
2. The unusual and rapid accumulation or runoff of surface waters from any source.
7.11 Flood Insurance Rate Map (FIRM) - The official map on which the Federal Emergency Management Agency has delineated both the areas of special flood hazards and the risk premium zones applicable to the community.
7.12 Flood Insurance Study - The official report provided by the Federal Emergency Management Agency that includes flood profiles, the Flood Boundary-Floodway Map, and the water surface elevation of the base flood.
7.13 Floodproofing - A combination of structural provisions, changes or adjustments to properties and structures subject to flooding for the purpose of reduction and elimination of flood damages to properties, water and sanitation facilities, structures and contents of buildings in a flood hazard area.
7.14 Floodway - 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 0.5 feet.
7.15 Flood Fringe - That portion of the flood plain inundated by the 100 year return frequency flood not within the floodway.
7.16 Flood Plain - The land adjacent to a body of water which has been or may hereafter be covered by floodwater.
7.17 Flood Profile - A graph or longitudinal profile showing the relationship of the water surface elevation of a flood event to location along a stream or river.
7.18 Flood Prone Areas - All areas in Larimer County indicated as being within Zone A on official maps issued by the U.S. Department of Housing and Urban Development
7.19 Lowest Floor - The lowest floor of the lowest enclosed area (including basement). An unfinished or flood resistant enclosure, usable solely for parking of vehicles, building access or storage, in an area other than a basement area, is not considered a building's lowest floor, 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.
7.20 Manufactured Home - 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 connected to the required utilities. The definition does not include recreational vehicles.
As amended March 4, 1996
7.21 New Construction - Structures for which the "state of construction" commenced on or after the effective date of the resolution, and includes any subsequent improvements to such structures.
7.22 Obstruction - Any dam, wall, wharf, embankment, levee, dike, pile abutment, projection, excavation, channel rectification, bridge structure or matter in, along, across, or projecting into any channel, water course, or regulatory flood hazard area which may impede, retard or change the direction of water flow, either in itself or by catching or collecting debris carried by such water, or that is placed where the flow of water might carry the same downstream to the damage of life and property elsewhere.
7.23 Recreational vehicle - A vehicle which is (1) built on a single chassis; (2) 400 square feet or less when measured at the largest horizontal projections; (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.
7.24 Regulatory Flood Datum - The reference elevation above mean sea level which represents the peak elevation of the 100 year return-frequency flood.
7.25 Regulatory Flood Protection Elevation - The elevation one and one-half feet above the regulatory flood datum.
7.26 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 the first placement for permanent construction of a structure on a site, such as the pouring of slab or footings, the installation of piles, or foundations. 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 the 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.
7.27 Structure- A walled and roofed building or manufactured home that is principally above ground.
7.28 Substantial Improvement - Any repair, reconstruction or improvement of a structure, the cost of which equals or exceeds 50 percent of the market value of the structure:
As amended March 4 , 1996
The term does not, however, include either:
7.29 Variances - A grant of relief from the requirements of this ordinance which permits construction in a manner that would otherwise be prohibited by this ordinance.
8.1 This supplemental regulation, as amended, shall take effect upon its approval and adoption.