The following words and phrases for this article (Airport Safety and Hazard Prevention Overlay Zone), unless the context otherwise requires, shall mean:
Air National Guard (ANG).The Air National Guard is a reserve component of the United States Air Force, organized by each of the several states and territories of the United States. The 173d Fighter Wing is an ANG unit located at the Crater Lake—Klamath Regional Airport. The 173d Fighter Wing provides training for new pilots and basic flight instruction on the F-15C.
Airport (also referred to as the Crater Lake—Klamath Regional Airport).Those properties lying generally south of the South Side Expressway, north of Lost River Diversion Channel, east of Spring Lake Road, and west of Homedale Road, which are owned and administered by the City of Klamath Falls for commercial, general, and military aviation purposes including taking off and landing aircraft. Refer to the Klamath Falls Airport Master Plan, Plan Drawings, for more information.
Airport Elevation.The highest point of an airport's usable runway, measured in feet above mean sea level.
Airport Imaginary Surfaces.Imaginary areas in space and on the ground that are established in relation to the airport and its runways as defined by the FAR Part 77. Imaginary surfaces are defined by the primary surface, runway protection zone, approach surface, horizontal surface, conical surface, and transitional surface.
Airport Noise Impact Boundary.Areas located within established noise contour boundaries equal to or exceeding 65 dB DNL.
1. Zone I: 65 dB DNL through 69.99 dB DNL.
2. Zone II: 70 dB DNL through 74.99 dB DNL.
3. Zone III: 75 dB DNL and above.
A-Weighted.A system utilizing a filter to de-emphasize the very low and very high frequency components of sound in a manner similar to the frequency response of the human ear.
Day-Night Average Sound Level (Ldn or DNL).A noise metric that averages A-weighted sound levels over a 24-hour period, with an additional 10 dB penalty added to noise events occurring between 10:00 p.m. and 7:00 a.m.
dB (Decibels).A unit of measure based on a logarithmic scale. A 10 dB increase in noise level corresponds to a 100% increase (doubling) in perceived loudness.
F-15C.An all-weather tactical fighter aircraft designed to gain and maintain air superiority in aerial combat. This aircraft is used by the 173d Fighter Wing for training at the Crater Lake—Klamath Regional Airport.
FAA.The Federal Aviation Administration.
Federal Aviation Regulation (FAR) Part 77.This regulation, titled "Objects Affecting Navigable Airspace," establishes standards for determining obstructions and their potential effects on aircraft operations. Objects are considered to be obstructions to air navigation according to FAR Part 77 if they exceed certain heights or penetrate certain imaginary surfaces established in relation to airport operations. Objects classified as obstructions are subject to an FAA aeronautical analysis to determine their potential effects on aircraft operations.
Hazard Zones.Land lying within the approach zones, transitional zones, horizontal zones, and conical zones as they apply to the Crater Lake—Klamath Regional Airport. Such zones are shown in this section of the Community Development Ordinance and in the Klamath Falls Airport Master Plan adopted by the City of Klamath Falls, which is 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 height limitation. The various zones are hereby established and defined as follows:
1. Runway Protection Zone (RPZ).An area off the runway end to enhance the protection of people and property on the ground. See the most current Klamath Falls Airport Master Plan for specific runway classifications.
2. Precision Instrument Runway.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 10,000 feet at a horizontal distance of 50,000 feet from the primary surface, its centerline being the continuation of the centerline of the runway. This approach surface 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; thence slopes upward 40 feet horizontally for each foot vertically to an additional horizontal distance of 40,000 feet along the extended runway centerline. See the Klamath Falls Airport Master Plan for specific runway classifications.
3. Nonprecision Instrument Runway.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 3,500 feet at a horizontal distance of 10,000 feet from the primary surface; its centerline being the continuation of the centerline of the runway. This approach surface slopes upward 34 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. See the Klamath Falls Airport Master Plan for specific runway classifications.
4. Utility Runway with Visual Approach.The inner edge of this approach zone coincides with the width of the primary surface and is 500 feet wide. The approach zone expands outward uniformly to a width of 1,500 feet at a horizontal distance of 5,000 feet from the primary surface, its centerline being the continuation of the centerline of the runway. This approach surface slopes upward 20 feet horizontally for each foot vertically. See the most current Klamath Falls Airport Master Plan for specific runway classifications.
5. Primary Surface.A surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends 200 feet beyond the end of that runway, but when the runway has no specially prepared hard surface, or planned hard surface, the primary surface ends at the end of the runway. 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 the primary surface of a runway will be that width prescribed in this article for the most precise approach existing or planned for either end of the runway. The width for the primary surface is:
a. 250 feet for utility runways having only visual approaches.
b. 500 feet for utility runways having non-precision approaches.
c. 500 feet for visual runways having only visual approaches.
d. 500 feet for non-precision instrument runways having visibility minimums greater than three-fourths of a statute mile.
e. 1,000 feet for non-precision instrument runway having a non-precision instrument approach with visibility minimum as low as three-fourths of a statute mile, and for precision instrument runways.
6. Transitional Surface.Those surfaces that 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 from the sides of the primary and approach surfaces to the point of intersection with the horizontal and conical surfaces. Transitional surfaces for those portions of the precision approach surfaces which project through and beyond the limits of the conical surface extend a distance of 5,000 feet measured horizontally from the edge of the approach surface and at 90-degree angles to the extended runway centerline.
7. Horizontal Surface.A horizontal plane 150 feet above the established airport elevation, the perimeter of which is constructed by swinging arcs of specified radii from the center of each end of the primary surface of each runway of each airport and connecting the adjacent arcs by lines tangent to those arcs. For a precision runway the horizontal surface is established by a 10,000-foot arc. For any other runway classification the horizontal surface is established by a 5,000-foot arc.
8. Conical Surface.A surface extending outward and upward from the periphery of the horizontal surface at a slope of 20 to 1 for a horizontal distance of 4,000 feet.
Height.The highest point of a structure or tree, plant or other object of natural growth or ground, measured from mean sea level.
Obstruction.Any structure or tree, plant or other object of natural growth that penetrates an imaginary surface. An obstruction can also mean anything that is determined to interfere with the established traffic pattern, even if that object or device does not penetrate an imaginary surface.
Public Assembly Facility.A permanent or temporary structure or facility, place or activity where concentrations of people gather in reasonably close quarters for purposes such as deliberation, education, worship, shopping, employment, entertainment, recreation, sporting events, or similar activities. Public assembly facilities include, but are not limited to, schools, churches, conference or convention facilities, employment and shopping centers, arenas, athletic fields, stadiums, clubhouses, museums, and similar facilities and places, but do not include parks, golf courses or similar facilities unless used in a manner where people are concentrated in reasonably close quarters. Public assembly facilities also do not include air shows, structures or uses approved by the FAA in an adopted airport master plan, or places where people congregate for short periods of time such as parking lots or bus stops.
Runway.A defined area on an airport prepared for landing and takeoff of aircraft along its length.
Water Impoundment.Includes wastewater treatment settling ponds, surface mining ponds, detention and retention ponds, artificial lakes and ponds, and similar water features. A new water impoundment includes an expansion of an existing water impoundment except where such expansion was previously authorized by land use action approved prior to the effective date of the ordinance codified in this article.
The following airport hazard zone map identifies the five different imaginary surfaces as established in the definitions section. |
(Ord. 17-10, 2017; Ord. 22-13, 2022)