In order to carry out the provisions of this section there are hereby created and established certain zones which are adopted and described herein, and which are depicted on the Iowa City airport zoning maps, dated January 15, 2019, and as thereafter amended by ordinance, which map is adopted by this chapter and which map is on file in the office of the city clerk, Iowa City, Iowa. Any structure or tree located in more than one zone is considered to be only in the zone with the more restrictive height and use limitation. The various zones hereby established and defined are as follows:
A. Approach Overlay Zone (AO) Defined: The airspace above a sloping plane extending outward from each end of each runway, rising uniformly at a fixed ratio, and of fixed size, through which aircraft commonly operate when arriving at, and departing from, the airport. AO zones vary in size and slope based upon the present or future use that can be expected for each airport runway.
1. AO Zones Designated: The AO zones at the airport are as follows:
a. Runway 25 (AO25): Beginning two hundred feet (200') beyond the runway threshold to the northeast, and centered on the extended centerline of the runway, the inner edge of the zone is five hundred feet (500') wide, expanding uniformly to an outer edge width of three thousand five hundred feet (3,500'). The altitude of the inner edge is the same as the altitude of the runway threshold at the centerline, as depicted on the airport zoning maps. For each thirty-four feet (34') of horizontal distance, the floor of the zone rises from the inner edge one foot (1') (34:1) for a horizontal distance of ten thousand feet (10,000').
b. Runway 7 (AO7): Beginning four hundred thirteen feet (413') beyond the paved portion at the end of the runway and centered on the extended centerline of the runway, the inner edge of the zone is five hundred feet (500') wide, expanding uniformly to an outer edge width of one thousand five hundred feet (1,500'). The altitude of the inner edge is the same as the altitude of the runway threshold at the centerline, as depicted on the airport zoning maps. For each twenty feet (20') of horizontal distance, the floor of the zone rises from the inner edge one foot (1') (20:1), continuing for a total horizontal distance of five thousand feet (5,000').
c. Runway 30 (AO30): Beginning two hundred feet (200') beyond the threshold at the southeast end of the runway and centered on the extended centerline of the runway, the inner edge of the zone is five hundred feet (500') wide, expanding uniformly to an outer edge width of three thousand five hundred feet (3,500'). The altitude of the inner edge is the same as the altitude of the runway threshold at the centerline, as depicted on the airport zoning maps. For each thirty four feet (34') of horizontal distance, the floor of the zone rises from the inner edge one foot (1') (34:1), for a total horizontal distance of ten thousand feet (10,000').
d. Runway 12 (AO12): Beginning two hundred feet (200') beyond the threshold to the northwest, and centered on the extended centerline of the runway, the inner edge of the zone is five hundred feet (500') wide, expanding uniformly to an outer edge width of one thousand five hundred feet (1,500'). The altitude of the inner edge is the same as the altitude of the runway threshold at the centerline, as depicted on the airport zoning maps. For each twenty feet (20') of horizontal distance, the floor of the zone rises from the inner edge one foot (1') (20:1), continuing for a total horizontal distance of five thousand feet (5,000').
2. Height Limitations:
a. Except as otherwise provided herein, no person shall construct or alter any structure, nor plant or grow any tree, so as to penetrate any approach overlay zone created herein.
b. No person shall establish or maintain any private roadway in any location that would result in penetration of any AO zone by any portion of any vehicle that shall be permitted to operate upon such roadway.
B. Controlled Activity Runway Protection Zone (CA-RPZ) Defined: An area of fixed size, underlying the innermost portion (closest to the runway end) of the AO zone for that runway, descending from the floor of the AO zone to the ground. The width and length of CA-RPZ may vary, and may be different on each runway end.
1. CA-RPZ Designated: The CA-RPZ for the airport are as follows:
a. Runway 25 (CA-RPZ25): Underlying the innermost one thousand feet (1,000') of the AO zone at the northeast end of the runway, the width of the CA-RPZ is five hundred feet (500') at the inner edge and expands uniformly to a width of seven hundred feet (700').
b. Runway 7 (CA-RPZ7): Underlying the innermost one thousand feet (1,000') of the AO zone at the southwest end of the runway, the width of the CA-RPZ is five hundred feet (500') at the inner edge and expands uniformly to a width of seven hundred feet (700').
c. Runway 30 (CA-RPZ30): Underlying the innermost one thousand feet (1,000') of the AO zone at the southeast end of the runway, the width of the CA-RPZ is five hundred feet (500') at the inner edge, expanding uniformly to a width of seven hundred feet (700').
d. Runway 12 (CA-RPZ12): Underlying the innermost one thousand feet (1,000') of the AO zone at the northwest end of the runway, the width of the CA-RPZ is five hundred feet (500') at the inner edge, expanding uniformly to a width of seven hundred feet (700').
2. Use Limitations:
a. No person shall establish or maintain any noncompatible use in any controlled activity-Runway Protection Zone zone.
b. No structures, other than airport structures, the location of which is dictated by function, either permanent or temporary, shall be permitted in any portion of any controlled activity-Runway Protection Zone zone on land that is the property of the city of Iowa City, Johnson County, or the state of Iowa.
C. Horizontal Overlay Zone (HO) Defined:
1. The airspace above a horizontal plane, the perimeter of which is established by swinging arcs of ten thousand foot (10,000') radii from the center of the inner edge of the AO zones of runways 25 and 30, and an arc of five thousand foot (5,000') radius from the center of the inner edge of the AO zone of runways 12 and 7, and connecting the adjacent arcs by lines tangent to those arcs. The floor of the HO zone is one hundred fifty feet (150') above the airport elevation, or eight hundred thirty four feet (834') above mean sea level.
2. Except as otherwise provided herein, no person shall construct or alter any structure, or plant or grow any tree, so as to penetrate the horizontal overlay zone created herein. (Ord. 02-4055, 12-10-2002)
3. The proposed structure may penetrate the HO if the airport operations specialist determines that:
a. The FAA has issued a "determination of no hazard to navigation";
b. The proposed structure does not exceed any TERPS zone or any other 14 CFR part 77 zone; and
c. The proposed structure does not require a change to instrument approaches, minimum safe altitude, traffic patterns altitude, takeoff/departure procedures or weather minimums or a change similar in nature either to the approach or departure of an aircraft. (Ord. 14-4589, 6-17-2014)
D. Transitional Overlay Zone (TO) Defined: The airspace above a sloping plane along each side of each runway, and from the sides of each AO zone. For each seven feet (7') horizontally the floor of the zone rises at the rate of one foot (1') of elevation (7:1).
1. TO Zones Designated: The TO zones for the airport are as follows:
a. Runway 25 (TO25): Along each side of the runway, beginning at a point two hundred fifty feet (250') from the centerline of the runway and at right angles to the runway centerline, and from each side of the AO zone at the northeast end of the runway, at right angles to the extended runway centerline. The TO zone is interrupted at the point where it intersects the HO zone.
b. Runway 7 (TO7): Along each side of the runway, beginning at a point two hundred fifty feet (250') from the centerline of the runway and at right angles to the runway centerline, and from each side of the AO zone at the northwest end of the runway, at right angles to the extended runway centerline. The TO zone ends at the point where it intersects the HO zone.
c. Runway 30/12 (TO30/12): Along each side of the runway, beginning at a point two hundred fifty feet (250') from the centerline of the runway and at right angles to the runway centerline, and from each side of the AO zone at each end of the runway at right angles to the extended runway centerline. The TO zone ends at the point where it intersects the HO zone.
2. Height Limitations:
a. Except as otherwise provided herein, no person shall construct or alter any structure, or plant or grow any tree, so as to penetrate any transitional overlay zone created herein.
b. No person shall establish or maintain any private roadway in any location that would result in penetration of any transitional overlay zone by any portion of any vehicle that shall be permitted to operate upon such roadway.
E. Conical Overlay Zone (CO) Defined:
1. The airspace above a sloped horizontal plane beginning at the periphery of the HO zone. For each twenty feet (20') horizontally, the floor of the zone rises one foot (1') in height (20:1) for a horizontal distance of four thousand feet (4,000').
2. Except as otherwise provided herein, no person shall construct or alter any structure, or plant or grow any tree, so as to penetrate the conical overlay zone created herein.
(Ord. 02-4055, 12-10-2002; amd. Ord. 19-4810, 11-4-2019)