Katana Consulting | 1 Measuring Airport Noise March 2014 Kevin
Terrell Katana Consulting
Slide 2
Katana Consulting | 2 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
Slide 3
Katana Consulting | 3 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. 27 Xerxes Ave Penn Ave 2012
Departure 2012 Landing SOURCE: www.macnoise.com/fl ightracker for
Tuesday, July 10th 2012 6am + 8 hourswww.macnoise.com/fl ightracker
Runway 30L/R RNAV departure tracks Katana analysis Key road
Proposed departure track RMT 50 th Street 135 23% 173 30% 4 1% 3 1%
70 12% 98 17% 98 17% # daily RNAV flights % of daily total 100 17%
30R 30L
Slide 4
Katana Consulting | 4 1 | For RNAV, FAAs 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
Slide 5
Katana Consulting | 5 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. Xerxes Ave Penn Ave 50 th Street France Ave 30R 30L
Slide 6
Katana Consulting | 6 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. Xerxes Ave Penn Ave 50
th Street France Ave 30R 30L
Slide 7
Katana Consulting | 7 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
Slide 8
Katana Consulting | 8 2 | DNL is the modeled logarithmic
average of noise exposure over the course of a year, adjusted for
our extra sensitivity to nighttime noise. SOURCE: Overview of Noise
Metrics at www.hmmh.com DaytimeNighttime + 10 dB
Slide 9
Katana Consulting | 9 2 | However, noise experts recognize that
DNL as a measurement is flawed. SOURCE: Whats In Your DNL?, Wyle
Laboratories, 2006 Limited explanation Reducing noise exposure to a
single value of DNL does not convey to the public the extent of the
impact upon them Missing factorsNot representative 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
Slide 10
Katana Consulting | 10 2 | DNL does not account for real world
perceptions of noise. SOURCE: Harris Miller Miller & Hanson
Basic Aircraft Terminology
Slide 11
Katana Consulting | 11 2 | 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. SOURCE: EC Position Paper
on Dose Response 2002, Katana analysis 1972 Highly Annoyed % of
People Annoyed by Aircraft Noise % Average Noise Exposure (dB)
Slide 12
Katana Consulting | 12 2 | Current research on plane noise
indicates that a 55 dB contour line is a more appropriate place to
draw that FONSI line. SOURCE: EC Position Paper on Dose Response
2002, Katana analysis 2002 Highly Annoyed % of People Annoyed by
Aircraft Noise % Average Noise Exposure (dB) 1972 Highly
Annoyed
Slide 13
Katana Consulting | 13 2 | 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
Slide 14
Katana Consulting | 14 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
Slide 15
Katana Consulting | 15 3 | California uses a more nuanced
logarithmic measurement called CNEL that accounts for evening
noise. L den is similar and is used in Europe. DaytimeEvening + 5
dB Nighttime + 10 dB CNEL @ MSP = ~ DNL + 1.5 decibels
Slide 16
Katana Consulting | 16 3 | 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. SOURCE: Methods of
Assessment of Airport Noise, NJS Burton, London South Bank
University 55 dB contour lines required55 dB limit on noise
Slide 17
Katana Consulting | 17 3 | 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
Slide 18
Katana Consulting | 18 3 | These additional noise measures are
already approved by FAA. SOURCE: FAA Airports Desk Reference,
Chapter 17
Slide 19
Katana Consulting | 19 3 | Summary of noise measures DNL
Flawed, logarithmic measurement + 65 dB DNL line for noise studies
is based on 40 year old research CNEL, etcN70 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?
Slide 20
Katana Consulting | 20 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
Slide 21
Katana Consulting | 21 4 | Recall that the FAA uses the 65 dB
contour as the area to analyze for a FONSI. Xerxes Ave Penn Ave 50
th Street France Ave SOURCE: www.macnoise.com
Slide 22
Katana Consulting | 22 4 | Other countries use the 55 dB
contour. Here, that extends to Penn Ave, beyond Lake Harriet and
encompasses thousands of additional people. Xerxes Ave Penn Ave 50
th Street France Ave SOURCE: MAC PBN Overview map,
www.macnoise.com; Katana analysis
Slide 23
Katana Consulting | 23 4 | Beyond Lake Harriet, departing
flights from medium aircraft typically exceed 70 decibels, and
would be counted as part of the N70 metric. SOURCE:
www.macnoise.com Altitude
Slide 24
Katana Consulting | 24 4 | With RNAV the N70 map to the
northwest of MSP would likely blanket Minneapolis, Richfield &
Edina with 100+ count tracks & the contour extends. Xerxes Ave
Penn Ave France Ave 27 50 th Street 2 1 N70 100+ N70 50+ Key road
Number of daily flights greater than 70 dB (N70) SOURCE:
www.macnoise.com; Katana analysis; 55 dB line is estimated based on
current RMT data 55 dB DNL
Slide 25
Katana Consulting | 25 4 | Arrivals would continue over the
lakes, as is the case today. Xerxes Ave Penn Ave France Ave 27 50
th Street 2 1 Number of daily flights greater than 70 dB (N70)
SOURCE: www.macnoise.com; Katana analysis, 55 dB line is estimated
based on current RMT data N70 100+ N70 50+ Key road 55 dB DNL
Arrival path
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Katana Consulting | 26 E G I J K L N P Q V 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 U F M B
C H D S T O 1 29 27 7 R 2 Local schools A.Lake Nokomis B.Our Lady
of Peace C.Hale Community D.Roosevelt High E.Windom F.Annunciation
G.Ramsey H.Field Community I.Washburn High J.Kenny K.Anthony
L.Armatage M.Carondelet N.Lake Harriet Upper O.Southwest High
P.Carondelet Q.Lake Harriet Lower R.Barton Open S.Pilgrim Lutheran
T.Lake Country U.Burroughs V.Academy of Holy Angels 55 dB CNEL,
est. 65 dB DNL 29 RMT N70, 100+ SOURCE: MAC PBN Overview,
www.macnoise.com; Katana + community analysis; 55 dB CNEL based on
2011 RMT data 8 A
Slide 27
Katana Consulting | 27 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
Slide 28
Katana Consulting | 28 5 | Summary Outdated metrics The FAAs
FONSI is based on an outdated metric and a 40 year old
understanding of the impact of noise New metrics availableWe just
need to ask 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 FAAs Those new metrics are available
to us we just need to demand action from our representatives
Slide 29
Katana Consulting | 29 Contact: Kevin Terrell
[email protected] www.katanaconsulting.com Board Member,
Lynnhurst Neighborhood Association (Minneapolis) Co-Founder, MSP
FairSkies For further information Visit www.mspFairSkies.org for a
more complete and narrated version of this and other
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