As used in this chapter, the following terms shall have the meanings respectively ascribed to them, unless the context clearly requires otherwise:

"Administrator" means the official charged with the enforcement of this chapter who shall be the county building official/code enforcement officer.

"Airport" means Walterboro Municipal Airport.

"Airport elevation" means the highest point on any usable landing surface expressed in feet above mean sea level.

"Approach surface" means a surface longitudinally centered on the extended runway centerline, extending outward and upward from the end of the primary surface and at the same slope as the approach zone height limitation slope set forth in Section 13.08.040. In plan view the perimeter of the approach surface coincides with the perimeter of the approach zone.

"Approach, transitional, horizontal and conical zones" means the zones set forth in Section 13.08.030.

"Conical surface" means a surface extending horizontally twenty (20) feet for every one foot vertically from the periphery of the horizontal surface.

"Hazard to air navigation" means an obstruction determined by the South Carolina Aeronautics Commission or the Federal Aviation Administration to have a substantial adverse effect on the safe and efficient utilization of navigable airspace in South Carolina.

Height. For the purpose of determining the height limits in all zones set forth in this chapter, the datum shall be mean sea level elevation unless otherwise specified.

"Horizontal surface" means a horizontal plane one hundred fifty (150) feet above established airport elevation, the perimeter of which in plan view coincides with the perimeter of the horizontal zone.

"Nonconforming use" means any preexisting structure or object of natural growth which is inconsistent with the provisions of this chapter any amendment to this chapter.

"Obstruction" means any structure, growth or other object, including a mobile object, which exceeds a limiting height set forth in Section 13.08.040.

"Permit" means a document issued by Colleton County allowing a person to begin an activity which may result in any structure or vegetation exceeding the height limitations provided for in this chapter.

"Person" means any individual, firm, partnership, corporation, company, association, joint stock association or governmental entity. The term includes trustee, receiver, assignee or similar representative of any of them.

"Primary surface" means a surface, with a specified width as provided in Section 13.08.030, longitudinally centered on the runway. When the runway has a specifically prepared hard surface, the primary surface extends two hundred (200) feet beyond each end of the runway. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline.

"Runway" means a specified area on an airport prepared for landing and takeoff of aircraft.

"Structure" means any object, including a mobile object, constructed or installed by any person, including but not limited to buildings, towers, cranes, smokestacks, earth formations, overhead transmission lines, flag poles and ship masts.

"Transitional surface" means surfaces which extend outward perpendicular to the runway centerline extended at a slope of seven feet horizontally for every one foot vertically from the sides of the primary and approach surfaces to where they intersect the horizontal and conical surfaces.

"Vegetation" means any object of natural growth.

"Zone" means all areas provided for in Section 13.08.030, generally described in three dimensions by reference to ground elevation, vertical distances from the ground elevation, horizontal distances from the runway centerline and the primary and horizontal surfaces, and capped at specific vertical limits by the surfaces of the zones provided for in Section 13.08.040. (Ord. 92-O-22 § 2, 1992)