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For May 4, 2010 BOS HearingTHIS THE CLERK OF THE BOARD FORMAT!!!purpose, as demonstrated by a plan submitted by the owner showing the uses to which the filledland will be put and the final dimensions of the proposed fill or other materials.B. Such fill or other materials shall be protected against erosion by a method approved by theDistrict including riprap, vegetative cover, bulk-heading, or other approved methods, unless astudy, prepared by an Arizona registered civil engineer, demonstrates that erosion protection isnot required.C. If the permittee proposes to remove a structure or a portion of the property from a FEMAfloodplain through the LOMR-F process, the permittee shall provide evidence the fill wasadequately compacted by submitting the results of compaction testing certified by an Arizonaregistered engineer. (Ord. 2010 FC-1; Ord. 2005 FC-2 § 2 (part), 2005; Ord. 1999 FC-1 § 1(part), 1999; Ord. 1988 FC-2 Art. 9 (B) (1), 1988)16.26.050Structures - Construction restrictions.A. Structures, residential and nonresidential, shall be constructed so as to offer the minimumobstruction to the flow of flood waters. Wherever possible, structures shall be constructed withthe same alignment as the direction of flood flow; and so far as practicable, shall be placedapproximately on the same alignment as those of adjoining structures.B. All structures, residential and nonresidential, shall be firmly anchored to prevent flotation,collapse or lateral movement which might otherwise result in damage to other structures orrestriction of bridge openings and other narrow sections of the watercourse. Anchoring formanufactured housing will be in conformance with state standards as established by the Office ofManufactured Housing under A. R. S. Title 41, Chapter 16, Article 2.C. Service facilities such as electrical and heating equipment, shall be constructed at or above theregulatory flood elevation for the particular area, or, in the case of nonresidential structures, beadequately flood proofed.D. Any structure designed or utilized for human habitation, whether residential or nonresidential,that is used on a full-time or part-time basis shall have the lowest floor elevated at or above theregulatory flood elevation. Certification of elevation is required pursuant to Section 16.20.070.Prior to the pouring of the first slab or the finished floor inspection, the applicant shall submit tothe Chief Engineer certification, sealed by an Arizona registered land surveyor that the elevationof the Lowest Floor is in compliance with the floodplain use permit.E. Non-habitable, enclosed areas within the regulatory floodplain and below the regulatory floodelevation shall be designed in accordance with 16.26.030.Eto equalize hydrostatic flood forceson exterior walls by allowing for the free entry and exit of flood waters.F. If fill is used to elevate any structure, the minimum elevation of the fill shall be at or above thebase flood elevation, and shall extend at such elevation for a distance of at least 25 10 feetbeyond the outside limit of the structure, and shall be adequately protected from erosion pursuantto Section 16.26.040.B unless a study or analysis prepared by an Arizona registered professionalcivil engineer demonstrates that a lesser distance or the absence of erosion protection isacceptable.G. Structures, residential or nonresidential, designed or utilized for human habitation, whether ona full-time or part-time basis, and which will be completely surrounded by floodwaters duringthe base flood shall only be permitted wherewhen:1. The product of the flow depth (d), in feet, times the square of the flow velocity (v), in feet persecond, of the surrounding flood waters of the base flood does not exceed the numerical value of44
For May 4, 2010 BOS HearingTHIS THE CLERK OF THE BOARD FORMAT!!!18 for a period in excess of 30 minutes at any point adjacent to the structure and associatedimprovements, including fill, and2. The surrounding flood waters of the base flood do not exceed 3 feet in depth at any pointadjacent to the structure and associated improvements, including fill.3. For purposes of this section, depth and velocity shall be post development values and shall becalculated as follows:a. When flow distribution information is available, it shall be used to provide the mostrepresentative values for flood depth and velocity.b. When approximate information is available, average depths and velocities may be used.(Ord. 2010 FC-1; Ord. 2005 FC-2 § 2 (part), 2005; 1998 FC-1 Section 2, 1998; Ord.1988 FC-2Art. 9 (B) (2), 1988)16.26.055Critical facilities.A. Critical facility means any of the following:1. A structure or facility that produces, uses or stores highly volatile, flammable, explosive,toxic, and/or water reactive materials;2. Hospitals, emergency medical facilities, nursing homes and/or housing facilities likely tohave occupants who may not be sufficiently mobile to avoid injury or death during a flood;3. Essential emergency response facilities, such as police stations, fire stations, emergencyshelters and/or operation centers that are needed for public safety and/or flood response activitiesbefore, during and after a flood; and4. Public and private utilities facilities, such as, but not limited to power, water and wastewatertreatment, and/or communications, that are vital to maintaining or restoring normal services toflooded areas before, during and after a flood.B. Applicability. The critical facility requirements shall only apply along watercourses whichhave FEMA designated floodplains. Where the 0.2 percent chance floodplain has not beenestablished, the Chief Engineer may require that this floodplain be delineated by the applicant.C. Critical facilities shall be located outside of the 0.2 percent annual chance (500-year)floodplain, if possible. If a critical facility must be located in a 0.2 percent annual chance (500-year) floodplain, it must be demonstrated that there is either a critical need to locate it within thefloodplain, or that there is not a suitable alternative site, as justified by an Arizona registeredcivil engineer. Any critical facility located within a 0.2 percent annual chance (500-year)floodplain shall be protected from that event. Protection includes, but is not limited to, elevatingthe lowest floor and all utilities and mechanical services to a minimum of one foot above thebase flood or to the 0.2 percent annual chance (500-year) floodplain water surface elevation,whichever is greater, providing elevated access ramps, if appropriate, adequately protecting thefacility from both lateral and vertical erosion associated with the 0.2 percent annual chance (500-year) floodplain, providing all weather access during the base flood and developing anemergency response plan.D. Existing critical facilities within the 0.2 percent annual chance (500-year) floodplain thatpropose substantial improvements and/or repairs shall be protected from the 0.2 percent annualchance (500-year) flood event. Protection includes, but is not limited to, elevating or floodproofing the lowest floor and all utilities and mechanical services to a minimum of one footabove the base flood or to the 0.2 percent annual chance (500-year) floodplain water surfaceelevation, whichever is greater, providing elevated access ramps, if appropriate, adequately45
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