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Article 6: Development Standards Section 6.21: Flood Regulations Orange County, North Carolina – Unified Development Ordinance Page 6-156 period, the cumulative cost of which equals or exceeds 50 percent of the market value of the structure before the improvement or repair is started must comply with the standards for new construction. For each building or structure, the 5 year period begins on the date of the first improvement or repair of that building or structure subsequent to the effective date of this ordinance. Substantial damage also means flood-related damage sustained by a structure on two separate occasions during a 10-year period for which the cost of repairs at the time of each such flood event, on the average, equals or exceeds 25 percent of the market value of the structure before the damage occurred. If the structure has sustained substantial damage, any repairs are considered substantial improvement regardless of the actual repair work performed. The requirement does not, however, include either: (i) Any project for improvement of a building required to correct existing health, sanitary or safety code violations identified by the building official and that are the minimum necessary to assume safe living conditions. (ii) Any alteration of a historic structure provided that the alteration will not preclude the structure’s continued designation as a historic structure. (C) Floodway and Non-encroachment Areas (1) Areas designated as floodways or non-encroachment areas are located within the SFHA established in Section 4.31.1.3 of this Ordinance. (2) The floodways and non-encroachment areas are extremely hazardous areas due to the velocity of floodwaters that have erosion potential and carry debris and potential projectiles. (3) The following provisions shall apply to all development within such areas: (a) No encroachments, including fill, new construction, substantial improvements and other developments shall be permitted unless it has been demonstrated through hydrologic and hydraulic analyses, performed according to standard engineering practice, that the proposed encroachment would not result in any increase in the flood levels during the occurrence of the base flood. Such certification and technical data shall be presented to the Floodplain Administrator before issuance of floodplain development permit. (b) If FEMA has approved a Conditional Letter of Map Revision (CLOMR), then a Letter of Map Revision (LOMR) must also be obtained upon completion of the proposed encroachment. (c) No manufactured homes shall be permitted. (D) Subdivisions, Manufactured Home Parks, and Major Developments All subdivisions, manufactured home parks, and major development proposals located within SFHAs shall: (1) Be consistent with the need to minimize flood damage. (2) Have public utilities and facilities such as sewer, gas, electric, cable, and water systems located and constructed to minimize flood damage. (3) Have adequate drainage provided to reduce exposure to flood hazards. to ensure local property owners within flood insurance are continuing to be eligible for applicable benefits under their flood policies. 148