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The Perceived Noise Level an dits Measurement (NEF Contours)
Transport Canada uses a method known as the "Noise Exposure Forecast" (NEF) which determines noise contours according to the level of use of air corridors, take-off and landing procedures, types of aircraft, direction of the runways, weather conditions and period of use (day or night).
The louder the perceived noise, the higher the NEF. A level of 40 indicates a very high noise area and is normally located in the immediate vicinity of the airport. A level of 25 indicates an area where aircraft-generated noise is generally perceived as being not as loud. In addition, Transport Canada considers areas that have a NEF greater than 30 as less compatible with residential uses.
According to the 2003-2023 Montréal-Dorval International Airport Plan a gradual decrease in noise levels has been recorded since the beginning of the 1980s despite an increase in air traffic density, which can be explained by the implementation of specific operational measures by the airport and by the technological improvements made to aircraft.
Sources: Transport Canada and Aéroports de Montréal
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19.1
Control construction in areas with environmental constraints
Montréal – Pierre Elliott Trudeau International Airport
Montréal – Pierre Elliott Trudeau International Airport is the primary international port of entry to Montréal and is one of the fundamental components of the freight transportation network. In June 2003, Aéroports de Montréal (ADM) tabled its 2003-2023 Montréal-Dorval International Airport Plan, which presents the overall vision for the development of the airport.
The Master Plan also considers the environmental constraints on urban development produced by an airport of this size, particularly in terms of land use and the management of nuisances, such as noise.
The airport is subject to the various rules established by Transport Canada , particularly those presented in the federal zoning by-law for Montréal – Pierre Elliott Trudeau International Airport . The by-law sets restrictions on building heights in specific air corridors. The zoning territory appears in illustration 2.7.2. This by-law is scheduled for an update in 2006.
Similarly, Transport Canada has established Noise Exposure Forecasts (NEF), which are measured as contours from 25 to 40 and which also appear in illustration 2.7.2. Consequently, the City has planned to implement the following measures:
- prohibit residential and institutional land use in areas where the NEF is greater than 35;
- require soundproofing for residential and institutional construction in areas where the NEF is greater than 30.
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