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For May 4, 2010 BOS HearingTHIS THE CLERK OF THE BOARD FORMAT!!!Chapter 16.26FLOODWAY FRINGE AREA REQUIREMENTSSections:16.26.010 Uses allowed.16.26.020 Conditions applicable to all uses.16.26.030 Elevations and flood proofing.16.26.040 Fill and fill materials.16.26.050 Structures - Construction restrictions.16.26.055 Critical facilities.16.26.060 Storage of materials and equipment.16.26.070 Utilities and sanitary facilities.16.26.080 Public right-of-way.16.26.090 Floodway fringe appeals and variances.16.26.010Uses allowed.Any use, to the extent not prohibited by this title or any other title or law, is allowed within thefloodway fringe area, (Ord. 1999 FC-1 § 1 (part), 1999; Ord. 1988 FC-2 Art. 9 (A), 1988)16.26.020Conditions applicable to all uses.A. The following general conditions, as set out in Sections 16.26.030 through 16.26.070, shallapply to all uses within the floodway fringe area and, for purposes of this chapter, otherregulatory floodplain areas where a floodway has not been defined or delineated including butnot limited to A, AO, AE, AH, A1-30 and Shaded X Zones as provided on adopted FIRMs, orthose regulatory floodplain areas defined by this title.B. No development, storage of materials or equipment, or other uses shall be permitted which,acting alone or in combination with existing or future uses, create a danger or hazard to life orproperty.C. Until a regulatory floodway is designated, nNo encroachment may increase the base floodlevel more than 1one tenth (0.1) of a foot or increase flood velocities more than 10% or 1 fps,whichever is less, at any property line, except when it can be demonstrated that the postdevelopmentvelocity is not an erosive velocity. The velocity subject to this standard may be theoverbank velocity, the channel velocity, or both, as appropriate based on the type of developmentand its location within the floodplain.D. Consideration of the effects of a proposed use or development shall be based on theassumption that there will be an equal degree of encroachment extending for a significant reachon both sides of the watercourse. (Ord. 2010 FC-1; Ord. 2005 FC-2 § 2 (part), 2005; Ord. 1999FC-1 § 1 (part), 1999; Ord. 1988 FC-2 Art. 9 (B) (part), 1988)16.26.030Elevation and flood proofing.A. New construction and substantial improvement of any habitable structure, either residential ornonresidential, shall have the lowest floor, including the basement, or in the case of42
For May 4, 2010 BOS HearingTHIS THE CLERK OF THE BOARD FORMAT!!!manufactured housing the lowest structural member, elevated at or above the regulatory floodelevation, which is one foot above the base flood elevation. Certification of elevation shall berequired pursuant to Section 16.20.070.Upon the completion of the structure the elevation of thelowest floor including basement shall be certified by a registered professional engineer orsurveyor and provided to the Floodplain Administrator.B. New construction and substantial improvement of any habitable structure, either residential ornonresidential, in a numbered Zone AO Zone (AO1, AO2, AO3, etc.) shall have the lowest floor,including basement, or in the case of manufactured housing the lowest structural member,elevated abovehigher than the highest adjacent grade at least one foot higher than the depthnumberdesignated by the numbered zone on the FIRM, or at least two feet above highestadjacent natural grade if no depth number is specified. Certification of elevation shall be requiredpursuant to 16.20.070.Upon completion of the structure a registered professional engineer shallcertify to the Floodplain Administrator that the elevation of the structure meets this standard.C. In sheet flooding or ponding areas, such as Zones AO and AH, require drainage paths aroundstructures on slopes to guide water away from structures.D. Non-residential, non-habitable structures shall either be elevated in conformance with16.26.025subsections A. and B., or together with attendant utility and sanitary facilities:1. Be flood proofed so that below the regulatory flood level elevation the structure is watertightwith walls substantially impermeable to the passage of water;2. Have structural components capable of resisting hydrostatic and hydrodynamic loads andeffects of buoyancy; and3. Be certified by an Arizona registered professional engineer or architect that the standards ofthis subsection are satisfied. Such certifications shall be provided to the FfloodplainAadministrator on a form approved by the District.E. All new construction and substantial improvements with fully enclosed areas below the lowestfloorregulatory flood elevation that are useable solely for parking of vehicles, building access orlimited storage in an area other than a basement and which are subject to flooding shall beconstructed of flood resistant materials to the regulatory flood elevation, have all servicefacilities elevated at or above the regulatory flood elevation, and be designed to automaticallyequalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by an Arizona registeredprofessional civil engineer or architect to or meet or exceed the following minimum criteria:1. A minimum of two openings on different sides of each enclosed area that have a total net areaof not less than one square inch for every square foot of enclosed area subject to flooding shallbe provided;2. The bottom of all openings shall be no higher than one foot above grade; and3. Openings may be equipped with screens, louvers, valves or other coverings or devicesprovided that they permit the automatic entry and exit of flood waters.F. Manufactured homes shall meet the above standards and also the standards in 16.34. (Ord.2010 FC-1; Ord. 2005 FC-2 § 2 (part), 2005)16.26.040Fill and fill materials.A. Any fill proposed to be deposited in the floodway fringe area must be shown to have somebeneficial purpose, and the amount thereof shall not be greater than is needed to achieve that43
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