December 14 2021 Proposed Agenda

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CABARRUS COUNTY DEVELOPMENT ORDINANCE CHAPTER 16-FLOOD DAMAGE PREVENTION________________________________ Section A(4); and (g) Flood openings to facilitate automatic equalization of hydrostatic flood forces shall be provided below Regulatory Flood Protection Elevation in conformance with the provisions of Part 5, Section B(4)(d). An accessory structure with a footprint less than 150 square feet or that is a minimal investment of $3,000 or less and satisfies the criteria outlined above is not required to meet the elevation or floodproofing standards of Part 5, Section B (2). Elevation or floodproofing certifications are required for all other accessory structures in accordance with Part 4, Section B(3). (9) Tanks. When gas and liquid storage tanks are to be placed within a Special Flood Hazard Area, the following criteria shall be met: (a) Underground tanks. Underground tanks in flood hazard areas shall be anchored to prevent flotation, collapse or lateral movement resulting from hydrodynamic and hydrostatic loads during conditions of the design flood, including the effects of buoyancy assuming the tank is empty; (b) Above-ground tanks, elevated. Above-ground tanks in flood hazard areas shall be elevated to or above the Regulatory Flood Protection Elevation on a supporting structure that is designed to prevent flotation, collapse or lateral movement during conditions of the design flood. Tank-supporting structures shall meet the foundation requirements of the applicable flood hazard area; (c) Above-ground tanks, not elevated. Above-ground tanks that do not meet the elevation requirements of Section B (2) of this ordinance shall be permitted in flood hazard areas provided the tanks are designed, constructed, installed, and anchored to resist all flood-related and other loads, including the effects of buoyancy, during conditions of the design flood and without release of contents in the floodwaters or infiltration by floodwaters into the tanks. Tanks shall be designed, constructed, installed, and anchored to resist the potential buoyant and other flood forces acting on an empty tank during design flood conditions. (d) Tank inlets and vents. Tank inlets, fill openings, outlets and vents shall be: (i)At or above the Regulatory Flood Protection Elevation or fitted with covers designed to prevent the inflow of floodwater or outflow of the contents of the tanks during conditions of the design flood; and (ii)Anchored to prevent lateral movement resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy, during conditions of the design flood. (10) Other Development. Prior to the issuance of a floodplain development permit for a temporary structure, the applicant must submit to the Floodplain Administrator a plan for the removal of such structure(s) in the event of a hurricane, flash flood, or other type of flood warning notification. The following information shall be submitted in writing to the Floodplain Administrator for review and written approval: (a)Fences in regulated floodways and NEAs that have the potential to block the passage of floodwaters, such as stockade fences and wire mesh fences, shall meet the limitations of Part 5, Section F of this ordinance. (b)Retaining walls, sidewalks and driveways in regulated floodways and NEAs. Retaining walls and Page 24 of 28 2021 NC Model Ordinance, Non-Coastal Amended