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Zone AO: Areas subject to inundation by one-percent annual chance shallow <br /> flooding(usually sheet flow on sloping terrain)where average depths are between <br /> one and three feet. Average flood depths derived from detailed hydraulic analyses <br /> are shown within this zone. <br /> Zone An: Areas subject to inundation by one-percent annual chance shallow <br /> flooding(usually areas of ponding)where average depths are between one and three <br /> feet. Average flood depths derived from detailed hydraulic analyses are shown <br /> within this zone. <br /> Zone AR: Areas that result from the decertification of a previously accredited flood <br /> protection system that is determined to be in the process of being restored to <br /> provide base flood protection. <br /> Zone A99: Areas subject to inundation by the one-percent annual chance flood <br /> event,but which will ultimately be protected upon completion of an under- <br /> construction Federal flood protection system. These are areas of special flood <br /> hazard where enough progress has been made on the construction of a protection <br /> system, such as dikes,dams, and levees,to consider it complete for insurance rating <br /> purposes. Zone A99 may only be used when the flood protection system has <br /> reached specified statutory progress toward completion. No base flood elevations or <br /> depths are shown. <br /> (2) Accessory structure (appurtenant structure)means a structure with a floor area 400 <br /> square feet or less that is located on the same parcel of property as the principal <br /> structure and the use of which is incidental to the use of the principal structure. <br /> Accessory structures should constitute a minimal initial investment, may not be <br /> used for human habitation, and be designed to have minimal flood damage <br /> potential. Examples of accessory structures are detached garages, carports, storage <br /> sheds,pole barns, and hay sheds. <br /> (3) Addition (to an existing structure)means any walled and roofed expansion to the <br /> perimeter of a structure in which the addition is connected by a common load- <br /> bearing wall other than a firewall. Any walled and roofed addition,which is <br /> connected by a firewall or is separated by independent perimeter load-bearing <br /> walls, is new construction. <br /> (4) Appeal means a request for a review of the floodplain administrator's interpretation <br /> of any provision of this Article. <br /> (5) Area of shallow flooding means a designated AO or Ali Zone on the community's <br /> Flood Insurance Rate Map(FIRM)with base flood depths from one to three feet <br /> where a clearly defined channel does not exist,where the path of flooding is <br /> unpredictable and indeterminate, and where velocity flow may be evident. Such <br /> flooding is characterized by ponding or sheet flow. <br />