Assessment ScoreCard – 31 Day

Assessment Scorecard headlines

All Assessments are based on an ambient background noise of 40 decibels i.e. a quiet residential area. If your property is located near to a busy road i.e. 70-75 decibels, the noise impact from aircraft will be significantly reduced, whilst the road remains busy.

Note: Airborne aircraft noise is typically in the range of 45dB - 65dB for heights below 26,000 feet and for a duration of 30-50 seconds. Whereas the average car, bus or HGV the duration is only a few seconds.

Date of survey

05/02/2022 10:15:03

UK Postcode

ELSTREE , HERTFORDSHIRE , WD6 3QY

Baseline geo-coordinates

51.6458 , -0.280177

Survey type

31 Day. Based on the 31 days prior to the survey date shown above.

Assessment band

REGULAR

Assessment actual value

9.78

Assessment description

Sound equates to a "B" road or busy "C" road i.e. regular traffic that will be noticeable at peak times which includes evenings and weekends. Location is on a secondary flight corridor or flight route or in a flight holding stack area. At times there will be multiple flight occurrences within the same hour, typically 4. Some of the flights will be below 7000 feet.

Band range

Lower: 7.0 --> Upper: 12.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

2,138 / 69.0 / 4.1 ✔

Flights above 26k feet.

309 / 10.0 / 0.6 ✔

Flights between 16k and 26k feet

103 / 3.3 / 0.2 ✔

Flights between 13k and 15k feet

44 / 1.4 / 0.1 ✔

Flights between 7k and 12k feet

737 / 23.8 / 1.4 ❌ (415)

Flights between 6k and 7k feet

668 / 21.5 / 1.3 ❌ (189)

Flights between 5k and 6k feet

74 / 2.4 / 0.1 ✔

Flights between 4k and 5k feet

5 / 0.2 / 0.0 ✔

Flights between 3k and 4k feet

11 / 0.4 / 0.0 ✔

Flights below 3k feet

187 / 6.0 / 0.4 ✔

4 or more flights per hour

206 / 6.6 ✔

9 or more flights per hour

33 / 1.1 ✔

Departures between 1.5k and 15k feet

48 / 1.5 / 0.1 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

4 / 0.1

1 AM

3 / 0.1

2 AM

6 / 0.2

3 AM

7 / 0.2

4 AM

9 / 0.3

5 AM

48 / 1.5

6 AM

155 / 5.0

7 AM

228 / 7.4

8 AM to 9 PM

1,523 / 49.1 / 3.5

10 PM

16 / 0.5

11 PM

14 / 0.5

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

28 ❌ (21)

Percentage of overflying occuring Out-Of-Hours and at Weekends

30 ✔

Minimum avg. distance in miles

0.46

Number of possible disruptions by; day / out-of-hours / hour

54.0 / 17.0 / 2.8 ✔

Flight holding stack identified?

No

Altitude for all flights

12,011 ❌ (15,935)

Altitude of departures between 1.5k and 15k feet

10,266 ✔

Altitude of flights below 20k feet

7,278 ❌ (7,901)

Busiest times of day
(Distruption: 0 - low, 25+ high)

Day of week, time, frequency and number of flight events.

16.70

Thursday @ 9:00 - 4 time(s) in 4 weeks. Approx:9 flight events.

14.60

Friday @ 10:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

13.70

Thursday @ 7:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

12.30

Friday @ 7:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.70

Thursday @ 8:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.80

Friday @ 8:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.60

Friday @ 6:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.20

Thursday @ 6:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.10

Friday @ 9:00 - 4 time(s) in 4 weeks. Approx:6 flight events.