(A) In order to carry the provisions of this chapter, there are hereby created and established certain airport zones which include all of the land lying within the Airport Combining District including, approach zones, transitional zones, horizontal zones and conical zones. An area located in more than one of the following zones is considered to be only the zone with more restrictive height limitation.
(B) Except as otherwise provided in this chapter, no structure or tree shall be erected, altered, allowed to grow, or be maintained in any zone created by this chapter to a height in excess of the applicable height limits herein established for the zone. The applicable height limitations are hereby established for each zone in question as follows:
(1) Utility Runway Visual Approach Zone. The inner edge of this approach zone coincides with the width of the primary surface and shall have a width as specified on the Airport Zoning Map. The approach zone expands outward uniformly to a width of 1,250 feet at a horizontal distance of 5,000 feet from the primary surface at a slope upward 25 feet horizontally for each foot vertically. The slope begins at the end of and at the same elevation as the primary surface and extending to a horizontal distance of 5,000 feet along the extended runway centerline.
(2) Heliport Visual Flight Rules (VFR) Approach Zone. The inner edge of this approach zone coincides with the width of the primary surface and shall have a width as specified on the Airport Zoning Map. The approach zone expands outward uniformly to a width of 500 feet at a horizontal distance of 4,000 feet from the primary surface at a slope upward 25 feet horizontally for each foot vertically. The slope begins at the end of and at the same elevation as the primary surface and extending to a horizontal distance of 5,000 feet along the extended runway centerline.
(3) Transitional Zones (LT). These zones are hereby established as the area beneath the transitional surfaces. These surfaces extend outward and upward at 90-degree angles to the runway centerline and the runway centerline extended at a slope of seven feet horizontally for each foot vertically beginning at the sides of and at the same elevation as the primary surface and the approach zones, extending to a height of 150 feet above the airport elevation. In addition to the foregoing, there are established height limits sloping upward and outward seven feet horizontally for each foot vertically beginning at the sides of and at the same elevation as the approach zones, and extending to where they intersect the conical surface. Where the precision instrument runway approach zone projects beyond the conical zone, height limits sloping upward and outward seven feet horizontally for each foot vertically shall be maintained beginning at the sides of and at the same elevation as precision instrument runway approach surface, and extending to horizontal distance of 5,000 feet measured at 90-degree angles to the extended runway centerline.
(4) Heliport VFR Transitional Zones. These zones extend from the sides of the primary surface and the approach zones a horizontal distance of 250 feet from the primary surface centerline and the extended primary surface centerline and slope upward and outward two feet horizontally for each foot vertically. The slope begins at the sides of and at the same elevation as the primary surface and the approach surfaces and extends a distance of 250 feet measured horizontally from 90-degree angles to the primary surface centerline and extended centerline.
(5) Horizontal Zone (H). The horizontal zone is hereby established by swinging arcs of radii specified on the Airport Zoning Map from the centerline of each end of the primary surface of each runway and connecting to the adjacent arcs by drawing lines tangent to those arcs. The horizontal zone extends at an elevation of 150 feet above the airport elevation, however it does not include the approach and transitional zones. The radius of each arc is 5,000 feet for all runways designated as utility or visual.
(6) Conical Zone (C). The conical zone is hereby established as the area that commences at the periphery of the horizontal zone and extends outward there from a horizontal distance of 4,000 feet. The conical zone slopes upward and outward 25 feet horizontally for each foot vertically beginning at the periphery of the horizontal zone and 150 feet above the airport elevation and extending to a height of 350 feet above the airport elevation. The conical zone does not include the precision instrument approach zones and the transitional zones.
(7) Primary Surface Zone (L). The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline. The width of a primary surface is 250 feet for utility runways having only visual approaches.
(8) Approach Surface Zone (AA). An approach surface is applied to each end of each runway based upon the type of approach available or planned for that runway end. The inner edge of the approach surface is the same width as the primary surface and it expands uniformly to a width of 1,250 feet for that end of a utility runway with only visual approaches. The approach surface extends for a horizontal distance of 5,000 feet at a slope of 25 feet to one for all utility and visual runways.
(1995 Code, § 10.100.060) (Ord. 00-1854, passed - -2000)