As used in this article, unless the context otherwise requires, the following terms shall have the respective meanings ascribed to them in this section:
Airport elevation:The established elevation of the highest point on the usable landing area measured in feet from mean sea level.
Airport hazard:Any structure or tree or use of land which obstructs the air space required for the flights of aircraft or which obstructs or interferes with the control or tracking and/or data acquisition in the landing, taking off or flight at an airport, or at any installation or facility relating to flight, and tracking and/or data acquisition of the flightcraft; hazardous, interfering with or obstructing such landing, taking off or flight of aircraft or which is hazardous to or interferes with tracking and/or data acquisition pertaining to flight and flight vehicles.
Airport hazard area:Any area of land or water upon which an airport hazard might be established if not prevented as provided in this article.
Airport reference point:The point established as the approximate geographic center of the airport landing area and so designated.
Approach surface:A surface longitudinally centered on the extended runway center line, 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 this article. In plan the perimeter of the approach surface coincides with the perimeter of the approach zone.
Board of adjustment:A board consisting of five (5) members appointed by the city council of the City of Brenham, Texas, as provided by Article 46e-10, Texas Revised Civil Statutes Annotated (1969).
Conical surface:A surface extending outward and upward from the periphery of the horizontal surface at a slope of 20 to 1 for a horizontal distance of four thousand (4,000) feet.
Hazard to air navigation:An obstruction determined to have a substantial adverse effect on the safe and efficient utilization of the navigable airspace.
Height:For the purpose of determining the height limits in all zones set forth in this article and shown on the zoning map, the datum shall be mean sea level elevation unless otherwise specified.
Horizontal surface:A horizontal plane one hundred fifty (150) feet above the established airport elevation, the perimeter of which in plan coincides with the perimeter of the horizontal zone.
Joint airport zoning board:A board consisting of five (5) members, two (2) members appointed by the city council of the City of Brenham, and two (2) members appointed by the Commissioner’s Court of Washington County, Texas. The four (4) members so appointed shall elect a fifth member who shall serve as chairman.
Landing area:The surface area of the airport used for the landing, take-off or taxiing of aircraft.
Nonconforming use:Any preexisting structure, object of natural growth or use of land which is inconsistent with the provisions of this article or an amendment thereto.
Nonprecision instrument runway:A runway having an existing instrument approach procedure utilizing air navigation facilities with only horizontal guidance, or area-type navigation equipment, for which a straight-in nonprecision instrument approach procedure has been approved or planned.
Obstruction:Any structure, growth or other object, including a mobile object, which exceeds a limiting height set forth in this article.
Person:An individual, firm, partnership, corporation, company, association, joint stock association or body politic, and includes trustee, receiver, assignee, administrator, executor, guardian or other representative.
Primary surface:A surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends two hundred (200) feet beyond each end of that runway; but when the runway has no specially prepared hard surface, or planned hard surface, the primary surface ends at each end of that runway. The width prescribed in Part 77 of the Federal Aviation Regulations (FAR) for the most precise approach existing or planned for either end of that runway. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway center line. The width of a primary surface is seventy-five (75) feet. For other than utility runways the width is:
(a) Five hundred (500) feet for visual runways having only visual approaches.
(b) Five hundred (500) for nonprecision instrument runways having visibility minimums greater than three-fourths statute mile.
Runway:A defined area on an airport prepared for landing and take-off of aircraft along its length.
Structure:An object, including a mobile object, constructed or installed by man, including, but not limited to, buildings, towers, cranes, smokestacks, earth formation and overhead transmission lines.
Transitional surfaces:These surfaces extend outward at ninety (90) degree angles to the runway center line and the runway center line extended at a slope of seven (7) feet horizontally for each foot vertically from the sides of the primary and approach surfaces to where they intersect the horizontal surface.
Tree:Any object of natural growth.
Visual runway:A runway intended solely for the operation of aircraft using visual approach procedures.
Utility runway:A runway that is constructed for and intended to be used by propeller-driven aircraft twelve thousand five hundred (12,500) pounds maximum gross weight and less.
(Ordinance adopted 3/10/83, sec. 2)