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W "NONHABITABLE MAJOR STRUCTURE" includes but is not limited to swimming pools; parking garages; pipelines, piers; canals, lakes, ditches, water and sewage treatment plants, electrical power plants; transmission and distribution lines, transformer pads, vaults, and substations, roads, bridges, streets, and Highways; underground storage tanks; communications buildings and towers, flagpoles and signs over 15 feet in height. (n) "NGVD" mean National Geodetic Vertical Datum - a geodetic datum* established by the National Ocean Service and frequently'referred to as the 1929 Mean -Sea Level Datum. Construction within the -coastal building zone shall meet the requirements of this Chapter. All structures shall be designed so as to minimize damage to life, property, and the natural environment. Assistance in determining the design parameters to minimize such damage may be found in the reference documents listed in Section 16 entitled "References." All major structures shall be anchored to their foundations in such a manner as to prevent flotation, collapse, or lateral displacement. Foundation design and construction shall consider all anticipated loads resulting from,design storm conditions,including wave, hydrodynamic, hydrostatic, and wind loads acting simultaneously with dead loads. Erosion computations for foundation design shall account for all vertical and lateral erosion and scour -producing forces, including localized scour due to the presence of structural components. 1. Pile Foundations - shall be required for buildings located in Federal Emergency Management Agency Flood Insurance Rage Map "V" (velocity) zones. (A) Pile dimensions, spacing, and embedment shall be designed consistent with the requirements of the site, taking into account all vertical, lateral, erosion and scour -producing forces. (B) Piles shall be driven to a penetration which achieves adequate bearing capacity taking into consideration the anticipated loss of soil above the design grade. (C) In addition to the normal foundation analysis, the pile foundation analysis shall consider piles in column action, where appropriate, from the bottom of the support structure to the design grade. (D) Consideration shall also be given to the degree of exposure to wave attack and the resulting impact loads on lateral or diagonal bracing between piles. 2. Monolithic Foundations - may be permitted in Federal Emergency Management Agency Flood Insurance Rate Map "A" or "B" Zones. (A) Monolithic foundations may be used if soil conditions permit and if located at an elevation which minimizes their effect on the beach and adjacent properties. Due consideration shall be given to their vulnerability to erosion under design storm conditions.