Ronald Reagan Washington National Airport · 2017-04-04 · NMT 11 (Marlan Forest) 19 NOTE: Early Morning Hours = 5 a.m., 6 a.m; Late Night Hours = 10 p.m., 11 p.m. and midnight to

Ronald Reagan Washington

National Airport

Assessment of Measured

Aircraft Noise Levels

[Appended]

February 16, 2017

2

Presentation Outline

• Methodology

• Summary of Data Assessed

• High-Level Overview

• Focused Review of Selected Sites

• General Findings

3

Methodology

• Selected sample data representative of the four seasons

from the MWAA noise monitoring system

• Focused on early morning and late night hours

• Assessed individual noise events from aircraft operating

at DCA recorded at each of the monitors:

– Maximum noise level (Lmax)

– Type of operation (arrival or departure) and runway used

– Aircraft type

– Airline or operator and flight number

4

Noise Data Assessed

• Monday, Wednesday, and Saturday of four

representative weeks in 2016:

– January 11, 13, and 16

– April 4, 6, and 9

– July 4, 6, and 9

– October 3, 5, and 8

• Early morning and late night hours:

– Early morning: 5 a.m. to 7 a.m.

– Late night: 10 p.m. to 1 a.m. of the following morning

• Approximately 65 to 68 percent of the assessed data

reflected North Flow conditions

5

Maximum Noise Level (Lmax)

6

Common Sounds on the

A-Weighted Decibel Scale

7

Noise Monitor Stations – Overall

SOURCE: Esri, HERE, DeLorme, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), MapmyIndia, NGCC, OpenStreetMap contributors, and the

GIS User Community, January 2017 (basemap); Airport Noise Office Metropolitan Washington Airport s Authority,

January 2017 (runways and monitors).

PREPARED BY: Ricondo & Associates, Inc., February 2017.

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Noise Monitor Stations – Early Morning Hours





9

Noise Monitor Stations – Late Night Hours





10

Lmax Range from Assessed Data

NMT 2 (Cabin John)

NOTE: Early Morning Hours = 5 a.m., 6 a.m; Late Night Hours = 10 p.m., 11 p.m. and midnight to 1 a.m.

SOURCE: Ricondo & Associates, Inc., based upon noise monitoring data provided by the Metropolitan Washington Airports Authority, February 2017.



NMT 3 (Langley Forest)

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NMT 4 (Potomac Palisades)

12





NMT 5 (Chain Bridge)

13





NMT 6 (Georgetown)

14





NMT 7 (Rosslyn)

15





NMT 8 (Old Town)

16





NMT 9 (Springfield)

17





NMT 10 (Fort Foote)

18





NMT 11 (Marlan Forest)

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NMT 12 (Tantallon)

20





NMT 17 (Southwest DC)

21





NMT 19 (North Mt. Vernon)

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NMT 20 (Dumbarton)

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NMT 22 (Avenel)

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Generalized Findings

Overall Noise Levels and Noise Events

• Data from NMTs along the river show comparable noise

levels on both sides for the majority of sites, suggesting

general adherence to the river course

• Deviation begins to the north near the Cabin John site

due to locations of NMTs and turns off of the river course

• To the south, noise levels are similar on both sides

although the numbers of events recorded is higher to the

east likely due to predominance of North Flow during the

assessment period and the final approach course

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Generalized Findings

Individual Aircraft Noise Levels

• Departures and arrivals produced similar ranges of Lmax

values at the various NMTs

• No aircraft type appeared to be the greatest culprit,

producing the highest Lmax*

• Lmax values of some regional jets (e.g., Embraer

170/175) were in the same range with mainline jets

(e.g., 737, A320)

• The highest ranges of Lmax recorded at each site did

not represent the majority of recorded Lmax values

*Note that very few events from MD-80s were recorded due to the hours assessed and the penalties associated with their operation during

early morning and late night hours.

Documents

Ronald Reagan Washington National Airport · 2017-04-04 · NMT 11 (Marlan Forest) 19 NOTE: Early Morning Hours = 5 a.m., 6 a.m; Late Night Hours = 10 p.m., 11 p.m. and midnight to