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Article 6: Development Standars9 <br /> Section 6.21: Flood Regulations <br /> period, the cumulative cost of which equals or exceeds 50 percent of the <br /> market value of the structure before the improvement or repair is started <br /> must comply with the standards for new construction. For each building <br /> or structure, the 5 year period begins on the date of the first improvement <br /> or repair of that building or structure subsequent to the effective date of <br /> this ordinance. Substantial damage also means flood-related damage <br /> sustained by a structure on two separate occasions during a 10-year <br /> period for which the cost of repairs at the time of each such flood event, <br /> on the average, equals or exceeds 25 percent of the market value of the <br /> structure before the damage occurred. If the structure has sustained <br /> substantial damage, any repairs are considered substantial improvement <br /> regardless of the actual repair work performed. The requirement does <br /> not, however, include either: <br /> (i) Any project for improvement of a building required to correct <br /> existing health, sanitary or safety code violations identified by the <br /> building official and that are the minimum necessary to assume <br /> safe living conditions. <br /> (ii) Any alteration of a historic structure provided that the alteration <br /> will not preclude the structure's continued designation as a <br /> historic structure. <br /> (C) Floodway and Non-encroachment Areas <br /> (1) Areas designated as floodways or non-encroachment areas are located within <br /> the SFHA established in Section 4.31.1.3 of this Ordinance. <br /> (2) The floodways and non-encroachment areas are extremely hazardous areas due. <br /> to the velocity of floodwaters that have erosion potential and carry debris and <br /> potential projectiles. <br /> (3) The following provisions shall apply to all development within such areas: <br /> (a) No encroachments, including fill, new construction, substantial <br /> improvements and other developments shall be permitted unless it has <br /> been demonstrated through hydrologic and hydraulic analyses, <br /> performed according to standard engineering practice, that the proposed <br /> encroachment would not result in any increase in the flood levels during <br /> the occurrence of the base flood. Such certification and technical data <br /> shall be presented to the Floodplain Administrator before issuance of <br /> floodplain development permit. <br /> (b) If FEMA has approved a Conditional Letter of Map Revision (CLOMR), <br /> then a Letter of Map Revision (LOMR) must also be obtained upon <br /> completion of the proposed encroachment. <br /> (c) No manufactured homes shall be permitted. <br /> (D) Subdivisions, Manufactured Home Parks, and Major Developments <br /> All subdivisions, manufactured home parks, and major development proposals located <br /> within SFHAs shall: <br /> (1) Be consistent with the need to minimize flood damage. <br /> (2) Have public utilities and facilities such as sewer, gas, electric, cable, and water <br /> systems located and constructed to minimize flood damage. <br /> (3) Have adequate drainage provided to reduce exposure to flood hazards. <br /> to ensure local property owners within flood insurance are continuing to be eligible for applicable benefits under <br /> their flood policies. <br /> Orange County, North Carolina—Unified Development Ordinance Page 6-156 <br />