Assessment ScoreCard – Full

Aircraft Traffic Assessment: Full Scorecard



The symbol indicates the measure is better than the average when compared with other assessed
UK postcodes. The ❌ represents the opposite. Assessed averages are shown in brackets.

See: for a full explanation about the Assessment scorecard.

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

09/02/2024 18:50:51

UK Postcode

HATFIELD-GARDEN-VILLAGE , HERTFORDSHIRE , AL6 9TX

Baseline geo-coordinates

51.8432 , -0.220657

Survey type

Full. Based on 93 days in 2019, during Mid Dec to Mid Jan, whole of April and August.

Assessment band

REGULAR

Assessment actual value

10.72

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

6,059 / 65.2 / 3.8

Flights above 26k feet.

2,305 / 24.8 / 1.5 (1,343)

Flights between 16k and 26k feet

694 / 7.5 / 0.4

Flights between 13k and 15k feet

118 / 1.3 / 0.1

Flights between 7k and 12k feet

793 / 8.5 / 0.5

Flights between 6k and 7k feet

273 / 2.9 / 0.2

Flights between 5k and 6k feet

593 / 6.4 / 0.4 (548)

Flights between 4k and 5k feet

1,108 / 11.9 / 0.7 (541)

Flights between 3k and 4k feet

147 / 1.6 / 0.1

Flights below 3k feet

28 / 0.3 / 0.0

4 or more flights per hour

365 / 3.9

9 or more flights per hour

43 / 0.5

Departures between 1.5k and 15k feet

2,485 / 26.7 / 1.6 (1,050)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

45 / 0.5

1 AM

10 / 0.1

2 AM

13 / 0.1

3 AM

7 / 0.1

4 AM

14 / 0.2

5 AM

27 / 0.3

6 AM

297 / 3.2

7 AM

462 / 5.0

8 AM to 9 PM

4,894 / 52.6 / 3.8

10 PM

173 / 1.9

11 PM

82 / 0.9

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

16

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

47 (44)

Minimum avg. distance in miles

0.46

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

28.0 / 13.0 / 1.5

Flight holding stack identified?

No

Altitude for all flights

19,514

Altitude of departures between 1.5k and 15k feet

6,527 (8,705)

Altitude of flights below 20k feet

6,847 (9,163)

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

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

7.40

Thursday @ 18:00 - 10 time(s) in 13 weeks. Approx:4 flight events.

7.83

Tuesday @ 16:00 - 9 time(s) in 13 weeks. Approx:4 flight events.

6.94

Monday @ 20:00 - 9 time(s) in 13 weeks. Approx:4 flight events.

5.39

Tuesday @ 9:00 - 9 time(s) in 13 weeks. Approx:3 flight events.

4.50

Friday @ 14:00 - 9 time(s) in 13 weeks. Approx:3 flight events.

9.56

Monday @ 7:00 - 8 time(s) in 13 weeks. Approx:5 flight events.

8.44

Tuesday @ 20:00 - 8 time(s) in 13 weeks. Approx:5 flight events.

7.44

Friday @ 18:00 - 8 time(s) in 13 weeks. Approx:4 flight events.

7.00

Sunday @ 20:00 - 8 time(s) in 13 weeks. Approx:4 flight events.

Our scorecard is designed to provide a greater understanding how the assessment was reached for your selected UK post code. To enable you to validate our assessment we also provide up to 10 occurrences when we believe the disruption will be at its highest.

For those that would like to perform their own analysis we can also provide the low level flight data that includes the length of time a plane existed inside your select airspace bubble.