Within the Airport Overlay District, the following height limitations apply.
(A) Nothing in this subchapter shall be construed as prohibiting the planting, growth, construction or maintenance of any tree or structure to maximum height of 50 feet above the ground. Except as otherwise provided in this subchapter, no structure or tree shall be erected, altered, or maintained, or be allowed to grow in any zone created by this subchapter to a height in excess of the applicable height limits herein established for such zone. The applicable height limitations are hereby established for each of the zones in question as follows:
(1) Runway 4-22 Approach Zones, larger than utility with visual approaches. Slope upward 20 feet horizontally for each foot vertically, beginning 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.
(2) Runway 9-27 Approach Zones, with precision instrument approaches. Slopes upward 50 feet horizontally for each foot vertically beginning at the end of and at the same elevation as the primary surface and extending to a horizontal distance of 10,000 feet along the extended runway centerline at which point the slope changes to an upward slope of 40 feet horizontally for each foot vertically for an additional horizontal distance of 40,000 feet.
(3) Conical Zone. Slopes upward and outward 20 feet horizontally for each foot vertically beginning at the periphery of the horizontal zone and at 150 feet above the airport elevation and extending to a height of 350 feet above the airport elevation.
(4) Horizontal Zone. Elevated 150 feet above the airport elevation at a height of 1,011 feet above mean sea level.
(5) Transitional Zones. Slopes upward and outward seven feet horizontally for each foot vertically, beginning at the sides of and at the same elevation as the primary surface and the approach surfaces and extending to a height of 150 feet above the airport elevation which is 1,011 feet above mean sea level. In addition to the foregoing, there are established height limits sloping seven feet outward for each foot upward beginning at the sides of and the same elevation as the approach surface, 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 by maintained beginning at the sides of and at the same elevation as the precision instrument runway approach surface, and extending to a horizontal distance of 5,000 feet measured at right angles to the extended runway centerline.
(B) Additional height limitations. Except as otherwise provided in the Airport Overlay District, no structure or tree shall be erected, altered, or maintained, or be allowed to grow in any zone created by the Airport Overlay District to a height in excess of the additional height limits herein established by I.C. 8-21-10-7 and defined as follows:
(1) A height that is 500 feet above ground level or 1,361 feet above mean sea level at the site of the object.
(2) A height that is 200 feet above ground level or 1,061 feet above mean sea level, within three nautical miles of the established reference point of the airport, and that height increases in the proportion of 100 feet for each additional nautical mile of distance from the airport up to a maximum of 500 feet.
(Ord. 10-01, passed 1-25-10)