§ 156.16  AIRSPACE OBSTRUCTION ZONING.
   (A)   Airspace zones.  In order to carry out the purpose of this chapter, as set forth above, the following airspace zones are hereby established: Primary Zone, Horizontal Zone, Conical Zone, Precision Instrument Approach Zone, and Transitional Zone. The locations and dimensions of these zones are as follows:
      (1)   Primary Zone.  All that land which lies directly under an imaginary primary surface, longitudinally centered on each runway, shall extend for 200 feet beyond the end of runway 11/29 and runway 17/35. The elevation of any point on the primary surface shall be the same as the elevation of the nearest point on the runway centerline. The width of the primary surface shall be 1,000 feet for runway 11/29 and 500 feet for runway 17/35. The width and length of the primary surface for other runways shall be determined as such runways are established.
      (2)   Horizontal Zone.  All that land which lies directly under an imaginary horizontal surface, 150 feet above the established airport elevation, which is a height of 1,722 feet above mean sea level. The perimeter of the horizontal zone shall be constructed by swinging arcs of specified radii from the center of each end of the primary surface of each runway, and by connecting the adjacent arcs by lines tangent to those arcs. The radius of each arc shall be 10,000 feet for runway 11/29 and for runway 17/35. The radius of each arc for future runways shall be established when such runways are constructed.
      (3)   Conical Zone.  All that land which lies directly under an imaginary conical surface, extending upward and outward from the periphery of the horizontal surface, at a slope of 20:1, for a horizontal distance of 4,000 feet, as measured radially outward from the periphery of the horizontal surface.
      (4)   Approach Zone.  All that land which lies directly under an imaginary approach surface, longitudinally centered on the extended centerline at each end of each runway. The inner edge of the approach surface is at the same width and elevation as, and coincides with the end of the primary surface. The approach surface inclines upward at a slope of 40:1 for runway 17/35 and for runway 11. The approach surface for runway 17/35 and runway 11 extends uniformly to a width of 3,500 feet, at a distance of 10,000 feet, and then continues at the same rate of divergence to the periphery of the conical surface.
      (5)   Precision Instrument Approach Zone.  All that land which lies directly under an imaginary precision instrument approach surface, longitudinally centered on the extended centerline of any runway designated as a precision instrument runway. The inner edge of the precision instrument approach zone is at the same width and elevation as, and coincides with the end of the primary surface. The precision instrument approach surface inclines upward at a slope of 50:1, for a horizontal distance of 10,000 feet, expanding uniformly to a width of 4,000 feet, and then continues upward for an additional horizontal distance of 40,000 feet, at a slope of 40:1, expanding uniformly to an ultimate width of 16,000 feet.
      (6)   Transitional Zone.  All that land which lies directly under an imaginary surface extending upward and outward at right angles to the runway centerline and extended at a slope of 7:1 from the sides of the primary surfaces and from the sides of the approach surfaces, until they intersect the horizontal surface or the conical surface. Transitional surfaces, for those portions of any precision instrument approach surface which projects through and beyond the limits of the conical surface, shall extend a distance of 5,000 feet, measured horizontally from the edge of the precision instrument approach surface and at right angles to the extended precision instrument runway centerline.
   (B)   Height restrictions.  Except as otherwise provided in this chapter, and except as necessary and incidental to airport operations, no structures shall be constructed, altered or maintained, and no tree shall be allowed to grow in any airspace zone so as to project above any of the imaginary airspace surfaces described in division (A) of this section.
   (C)   Boundary limitations.  The city may regulate the location, size, and use of buildings and the density of population in any portion of any airport hazard area which is under any approach zone for a distance not exceeding two miles from the airport boundary. The city may also establish height restriction zoning in those areas, for a distance not to exceed one and one-half miles from the airport boundary.
(Ord. passed 9-15-77)  Penalty, see § 156.99