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Measuring Airport Noise. Kevin Terrell Katana Consulting. March 2014. Agenda. 1. Background and FAA outreach 2. The noise metric Day-Night-Level 3. Understanding alternative noise metrics 4. Applying alternative metrics at MSP 5. Summary and action plan.

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Measuring airport noise

Measuring Airport Noise

Kevin Terrell

Katana Consulting

March 2014


Agenda

1. Background and FAA outreach

2. The noise metric Day-Night-Level

3. Understanding alternative noise metrics

4. Applying alternative metrics at MSP

5. Summary and action plan


1 | Under RNAV, SW Minneapolis and Edina would have had a 5x increase in noise and number of departures, with 23% of ~580 daily departures.

2012 Departure

2012 Landing

70

12%

100

17%

98

17%

Key road

Proposed departure track

3

1%

# daily RNAV flights

% of daily total

4

1%

98

17%

  • SOURCE:

  • www.macnoise.com/flightracker for Tuesday, July 10th 2012 6am + 8 hours

  • Runway 30L/R RNAV departure tracks

  • Katana analysis

135

23%

50th Street

27

RMT

173

30%

30R

Penn Ave

30L

Xerxes Ave


1 | For RNAV, FAA’s outreach will advise you that there is a Finding of No Significant Impact or “FONSI” relative to a noise limit of 65 dB DNL.

SOURCE: FAA Airports Desk Reference, Chapter 17


1 | The 65 dB line the FAA uses for a FONSI extends at most about 1.5 miles from the end of runways 30L and 30R.

France Ave

50th Street

Penn Ave

30R

30L

Xerxes Ave


1 | Locally we use the 60 dB line to decide if the MAC must provide noise mitigation. The FAA does not heed that community guideline for a FONSI.

France Ave

50th Street

Penn Ave

30R

30L

Xerxes Ave


Agenda

1. Background and FAA outreach

2. The noise metric Day-Night-Level

3. Understanding alternative noise metrics

4. Applying alternative metrics at MSP

5. Summary and action plan


2 | DNL is the modeled logarithmic average of noise exposure over the course of a year, adjusted for our extra sensitivity to nighttime noise.

Daytime

Nighttime

+ 10 dB

SOURCE: Overview of Noise Metrics at www.hmmh.com


2 over the course of a year, adjusted for our extra sensitivity to nighttime noise.| However, noise experts recognize that DNL as a measurement is flawed.

Limited explanation

Missing factors

Not representative

“Reducing noise exposure to a single value of DNL does not convey to the public the extent of the impact upon them”

“A DNL contour map does not tell residents how many times airplanes fly over them, at what time of day, what type of airplanes, or how those flights may interfere with activities, such as sleep and watching television”

“If the number of aircraft noise events above the minimum threshold that an individual finds annoying increases, then the noise environment for that person has increased”

SOURCE: What’s In Your DNL?, Wyle Laboratories, 2006


2 over the course of a year, adjusted for our extra sensitivity to nighttime noise.| DNL does not account for real world perceptions of noise.

SOURCE: Harris Miller Miller & Hanson “Basic Aircraft Terminology”


2 over the course of a year, adjusted for our extra sensitivity to nighttime noise.| The application of DNL is based on 40 year old research showing 13% of the population is highly annoyed by 65 decibels of average noise.

% of People Annoyed by Aircraft Noise

%

1972 Highly Annoyed

Average Noise Exposure (dB)

SOURCE: EC Position Paper on Dose Response 2002, Katana analysis


2 | Current research on plane noise indicates that a 55 dB contour line is a more appropriate place to draw that “FONSI” line.

% of People Annoyed by Aircraft Noise

2002 Highly Annoyed

%

1972 Highly Annoyed

Average Noise Exposure (dB)

SOURCE: EC Position Paper on Dose Response 2002, Katana analysis


2 contour line is a more appropriate place to draw that | Additional research indicates that average noise levels over 55 dB can have a noticeable impact on the reading skills of schoolchildren.

SOURCE: European Environment Agency report No 11/2010


Agenda contour line is a more appropriate place to draw that

1. Background and FAA outreach

2. The noise metric Day-Night-Level

3. Understanding alternative noise metrics

4. Applying alternative metrics at MSP

5. Summary and action plan


3 | California uses a more nuanced logarithmic measurement called CNEL that accounts for evening noise. Lden is similar and is used in Europe.

Daytime

Evening

+ 5 dB

Nighttime

+ 10 dB

CNEL @ MSP = ~ DNL + 1.5 decibels


3 called CNEL that accounts for evening noise. | Many countries use the 55 dB CNEL contour to restrict uses due to health concerns, and all of Europe is required to show the 55 dB contour.

55 dB contour lines required

55 dB limit on noise

SOURCE: Methods of Assessment of Airport Noise, NJS Burton, London South Bank University


3 called CNEL that accounts for evening noise. | N70 is an easy to understand measurement developed in Australia. It is calculated using the same noise model that the FAA uses for DNL.

SOURCE: Expanding Ways to Describe and Assess Aircraft Noise, Department of Transport and Regional Services, Australia


3 called CNEL that accounts for evening noise. | These additional noise measures are already approved by FAA.

SOURCE: FAA Airports Desk Reference, Chapter 17


3 called CNEL that accounts for evening noise. | Summary of noise measures

DNL

CNEL, etc

N70

Flawed, logarithmic measurement

+

65 dB DNL line for noise studies is based on 40 year old research

Updated & slightly better logarithmic measurement

+

55 dB contour line is required in EU and used by some to limit impact

A simple, linear measurement

=

How many times a day can I not hear you because of a plane?


Agenda called CNEL that accounts for evening noise.

1. Background and FAA outreach

2. The noise metric Day-Night-Level

3. Understanding alternative noise metrics

4. Applying alternative metrics at MSP

5. Summary and action plan


4 | Recall that the FAA uses the 65 dB contour as the area to analyze for a FONSI.

France Ave

50th Street

Penn Ave

Xerxes Ave

SOURCE: www.macnoise.com


4 to analyze for a FONSI.| Other countries use the 55 dB contour. Here, that extends to Penn Ave, beyond Lake Harriet and encompasses thousands of additional people.

France Ave

50th Street

Penn Ave

Xerxes Ave

SOURCE: MAC PBN Overview map, www.macnoise.com; Katana analysis


4 to analyze for a FONSI.| Beyond Lake Harriet, departing flights from medium aircraft typically exceed 70 decibels, and would be counted as part of the N70 metric.

Altitude

SOURCE: www.macnoise.com


4 to analyze for a FONSI.| With RNAV the N70 map to the northwest of MSP would likely blanket Minneapolis, Richfield & Edina with 100+ count tracks & the contour extends.

Number of daily flights greater than 70 dB (N70)

N70 100+

N70 50+

2

55 dB DNL

1

Key road

France Ave

50th Street

27

Penn Ave

Xerxes Ave

SOURCE: www.macnoise.com; Katana analysis; 55 dB line is estimated based on current RMT data


4 to analyze for a FONSI.| Arrivals would continue over the lakes, as is the case today.

Number of daily flights greater than 70 dB (N70)

N70 100+

N70 50+

Arrival path

2

55 dB DNL

1

Key road

France Ave

50th Street

27

Penn Ave

Xerxes Ave

SOURCE: www.macnoise.com; Katana analysis, 55 dB line is estimated based on current RMT data


4 | The 55 dB CNEL contour and N70 would affect 19 more schools than the FAA addresses today, including 1/3 of Minneapolis’ total public enrollment

1

2

8

Local schools

Lake Nokomis

Our Lady of Peace

Hale Community

Roosevelt High

Windom

Annunciation

Ramsey

Field Community

Washburn High

Kenny

Anthony

Armatage

Carondelet

Lake Harriet Upper

Southwest High

Carondelet

Lake Harriet Lower

Barton Open

Pilgrim Lutheran

Lake Country

Burroughs

Academy of Holy Angels

29

O

H

R

P

Q

C

S

B

D

T

N

I

U

G

M

F

27

L

A

J

K

E

N70, 100+

7

55 dB CNEL, est.

V

65 dB DNL

29

RMT

SOURCE: MAC PBN Overview, www.macnoise.com; Katana + community analysis; 55 dB CNEL based on 2011 RMT data


Agenda schools than the FAA addresses today, including 1/3 of Minneapolis

1. Background and FAA outreach

2. The noise metric Day-Night-Level

3. Understanding alternative noise metrics

4. Applying alternative metrics at MSP

5. Summary and action plan


5 | Summary schools than the FAA addresses today, including 1/3 of Minneapolis

Outdated metrics

New metrics available

We just need to ask

Those new metrics are

available to us – we just

need to demand action

from our

representatives

The FAA’s FONSI is

based on an outdated

metric and a 40 year

old understanding of

the impact of noise

There are more current,

more accurate and

easier to understand

ways to express

the impact of noise on

our community

This is OUR community – not the FAA’s


For further information schools than the FAA addresses today, including 1/3 of Minneapolis

  • Contact:

    • Kevin Terrell

    • [email protected]

    • www.katanaconsulting.com

    • Board Member, Lynnhurst Neighborhood Association (Minneapolis)

    • Co-Founder, MSP FairSkies

Visit www.mspFairSkies.org for a more complete and narrated version of this and other presentations


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