In order to carry out the provisions of this section, there are hereby created and established certain zones, which include all of the land lying beneath the approach surfaces, transitional surfaces and conical surfaces as they apply to the Northwest Iowa Regional Airport. Such zones are shown on the Northwest Iowa Regional Airport zoning map prepared by the city and made a part hereof. An area located in more than one of the following zones is considered to be only in the zone with the more restrictive standard. The various zones and height limitations are hereby established and defined as follows.
(A) Airport zones.
(1) Approach surface zone. 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 below. In plan, the perimeter of the approach surface coincides with the perimeter of the approach zone.
(2) Inner approach surface zone. The inner portion of the approach surface extends out from the runway end to the where the 14 C.F.R. part 77(C) approach surface reaches a 100-foot height above the ground elevation.
(3) Runway with a precision instrument approach zone. The inner edge of this approach zone coincides with the width of the primary surface and is 1,000 feet wide. The approach zone expands outward uniformly to a width of 16,000 feet at a horizontal distance of 50,000 feet from the primary surface. Its centerline is the continuation of the centerlines of runway 12 (existing) and runway 18 (planned).
(4) Runway protection zone (RPZ). An area off the runway end to enhance the protection of people and property on the ground.
(5) Runway 30 and runway 36 instrument approach zone. The inner edge of this approach zone coincides with the primary surface and is 1,000 feet wide. The approach zone extends out uniformly to a width of 16,000 feet at a horizontal distance of 5,000 feet from the primary surface. Its centerline is the continuation of the centerlines of runways 30 and 36.
(6) Transitional zones. The transitional zones are the areas beneath the transitional surfaces.
(7) Horizontal zone. The horizontal zone is established by swinging arcs of 10,000 feet radii from the center of each end of the primary surface of each runway and connecting the adjacent arcs by drawing lines tangent to those arcs. The horizontal zone does not include the approach and transitional zones.
(8) Conical zone. The conical zone is a surface extending outward and upward from the periphery of the horizontal surface at a slope of 20 to one for a horizontal distance of 4,000 feet.
(9) Primary surface zone. The surface longitudinally centered on a runway. The primary surface is extended 200 feet beyond each end of each runway. The width of the primary surface is 1,000 feet. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline.
(B) Height limitations. Except as otherwise provided in this subchapter, no structure shall be erected, altered or maintained, and no tree shall be allowed to grow in any zone created by this subchapter to a height in excess of the applicable height limit herein established for such zone. Such applicable height limitations are hereby established for each of the zones in question as follows.
(1) Runway 30. Slopes 40 feet outward for each foot upward beginning at the end of, and at the same elevation as the primary surface, and extending to a horizontal distance of 50,000 feet along the extended centerline.
(2) Runway 36. Slopes 40 feet outward for each foot upward beginning at the end of, and at the same elevation as the primary surface, and extending to a horizontal distance of 50,000 feet along the extended centerline.
(3) Runway 18. Slopes 50 feet outward for each foot upward beginning at the end of, and at the same elevation as the primary surface, and extending to a horizontal distance of 10,000 feet, then slopes 40 feet outward for each foot upward extending to a horizontal distance of 40,000 feet along the extended centerline.
(4) Runway 12. Slopes 50 feet outward for each foot upward beginning at the end of, and at the same elevation as the primary surface, and extending to a horizontal distance of 10,000 feet, then slopes 40 feet outward for each foot upward extending to a horizontal distance of 40,000 feet along the extended centerline.
(5) Transitional zones. Slope seven feet outward for each foot upward beginning at the sides of and at the same elevation as the primary surface and the approach surface, and extending to a height of 150 feet above the airport elevation which is 1,340.7 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 at the same elevation as the approach surface, and extending to where they intersect the conical surface. Where the runway approach zone projects beyond the conical zone, there are established height limits sloping seven feet outward for each foot upward beginning at the sides of and at the same elevation as the approach surface, and extending a horizontal distance of 5,000 feet measured at 90-degree angles to the extended runway centerline.
(6) Horizontal zone. Established at 150 feet above the airport elevation or at a height of 1,490.70 feet above mean sea level.
(7) Conical zone. Slopes 20 feet outward for each foot upward 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.
(Prior Code, § 9-15-3) (Ord. 697, passed 3-1-2010) Penalty, see § 155.999