17.50.040 Airport zones and airspace height limitations.
In order to carry out the provisions of this chapter, there are hereby created and established certain zones which are depicted on the Ida Grove municipal airport height zoning map. A structure located in more than one zone of the following zones is considered to be only in the zone with the more restrictive height limitation. The various zones are hereby established and defined as follows:
(1) Airport Height Zones.
(a) Horizontal Zone. The land lying under a horizontal plane 150 feet above the established airport elevation, the perimeter of which is constructed by:
(i) Swinging arcs of 5,000-foot radii from the center of each end of the primary surface of runway(s) 11 and 29, and connecting the adjacent arcs by lines tangent to those arcs.
Note: The radius of the arc specified for each end of a runway will have the same arithmetical value. That value will be the highest determined for either end of the runway. When a 5,000 feet arc is encompassed by tangents connecting two adjacent 10,000 feet arcs, the 5,000 feet arc shall be disregarded on the construction of the perimeter of the horizontal surface.
No structure shall exceed 150 feet above the established airport elevation in the horizontal zone, as depicted on the Ida Grove municipal airport height zoning map.
(b) Conical Zone. The land lying under 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. No structure shall penetrate the conical surface in the conical zone, as depicted on the Ida Grove municipal airport height zoning map.
(c) Approach Zone. The land lying under a surface longitudinally centered on the extended runway centerline and extending outward and upward from each end of the primary surface. (Note: An approach surface is applied to each end of each runway based upon the type of approach available or planned for that runway end.)
(i) The inner edge of the approach surface is: 500 feet wide for runway(s) 11 and 29.
(ii) The outer edge of the approach zone is: 2,000 feet for runway(s) 11 and 29.
(iii) The approach zone extends for a horizontal distance of: 5,000 feet at a slope of 20 to one for runway(s) 11 and 29.
No structure shall exceed the approach surface to any runway, as depicted on the Ida Grove municipal airport height zoning map.
(d) Transitional Zone. The land lying under those surfaces extending outward and upward at right angles to the runway centerline and the runway centerline extended at a slope of seven to one from the sides of the primary surface and from the sides of the approach surfaces.
No structure shall exceed the transitional surface, as depicted on the Ida Grove municipal airport height zoning map.
(e) No structure shall be erected in Ida County that raises the published minimum descent altitude or decision height for an instrument approach to any runway, nor shall any structure be erected that causes the minimum obstruction clearance altitude or minimum enroute altitude to be increased on any federal airway in Ida County. [Code 1975 § 8-5.04.]