06-A Adopting Model Flood Damage Prevention Ordinance

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Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or similar landform which originates at the apex and is characterized by high-velocity flows; active processes of erosion, sediment transport, and deposition; and unpredictable flow paths. Apex means a point on an alluvial fan or similar landform below which the flow path of the major stream that formed the fan becomes unpredictable and alluvial fan flooding can occur. Appurtenant structure means a structure which is on the same parcel of property as the principal structure to be insured and the use of which is incidental to the use of the principal structure. Area of future conditions flood hazard means the land area that would be inundated by the l-percent-annual chance (100 year) flood based on future conditions hydrology. Area of shallow flooding means a designated AO, AH, ARI AO, ARI AH, or VO zone on a city's Flood Insurance Rate Map (FIRM) with a I percent or greater annual chance of flooding to an average depth of I to 3 feet where a clearly defined channel does not exist, where the path of flooding is unpredictable and where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow. Area of special flood hazard is the land in the floodplain within a city subject to a I percent or greater chance of flooding in any given year. The area may be designated as Zone A on the Flood Hazard Boundary Map (FHBM). After detailed rate making has been completed in preparation for publication of the FIRM, Zone A usually is refined into Zones A, AO, AH, AI-3D, AE, A99, AR, ARlAI-30, ARlAE, ARlAO, ARlAH, ARIA, VO, VI-3D, VE, or V. Base flood means the flood having a I percent chance of being equaled or exceeded in any given year. Basement means any area of the building having its floor subgrade (below ground level) on all sides. 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 feature means an integral and readily identifiable part of a flood protection system without which the flood protection provided by the entire system would be compromised. Development means any man-made change to improved and unimproved real estate, including, but not limited to, buildings or other structures, mining, dredging, filling, grading, paving, excavation, or drilling operations or storage of equipment or materials. Elevated building means, for insurance purposes, a non-basement building Page 3 of 17