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The aircraft Noise Exposure Forecast was developed in the United States of America in the late 1960s and subsequently refined in Australia in 1982. Because of the unique nature of military air operations, both in terms of the functions undertaken and the type of aircraft used, the Department of Defence is responsible for the production of Australian Noise Exposure Forecasts maps (ANEF) for military airfields.
The ANEF system is a scientific measure of the forecast noise exposure levels. ANEF maps are generally for the ensuing ten years and are based on future projections of operational activities. The forecasts take into account a range of factors including frequency of aircraft movements, allocation of these movements to flight paths, aircraft noise signatures (intensity, duration and tonal content), together with detailed performance characteristics specific to each aircraft type.
The ANEF maps are plans of the airfield and environs on which noise exposure contours have been drawn. The contours, which may be 20, 25, 30, 35 and 40 ANEF units shown on the ANEF maps, define land areas around the airfield which are affected by the ANEF. The higher the ANEF value the greater exposure to the aircraft noise in that area. It should be noted, however, that land outside the ANEF affected area may also be exposed to aircraft noise.
Department of Defence prepares the ANEF maps in accordance with Australian Standard 2021-2000 Acoustics - Aircraft Noise Intrusion - Building Siting and Construction.
Included with the ANEF map for each airfield is a table advising building site acceptability based on ANEF Zones (see Table 2.1). This table is reproduced from Australian Standard 2021-2000. Copies of the ANEF maps for each military airfield are provided to relevant State and local government planning authorities for inclusion in planning controls with a view to minimizing the impact of aircraft noise by restraining certain developments in high noise areas.
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