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

09/05/2022 20:20:04

UK Postcode

MARKYATE , HERTFORDSHIRE , AL3 8QH

Baseline geo-coordinates

51.8438 , -0.464286

Survey type

31 days from the 1st date shown in the Evidence table below .

Assessment band

HIGH

Assessment actual value

16.52

Assessment description

Sound equates to a busy "A" road or Dual Carriageway i.e. regular traffic that will be noticeable at peak times which includes evenings and weekends. Location is on a primary flight corridor or busy flight route or in a flight holding stack area. At times there will be multiple flight occurrences within the same hour, typically between 4-15. Some of the flights will be below 7000 feet.

Band range

Lower: 16.0 --> Upper: 20.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

5,493 / 177.2 / 10.4 ❌ (3,426)

Flights above 26k feet.

422 / 13.6 / 0.8 ✔

Flights between 16k and 26k feet

1,245 / 40.2 / 2.4 ❌ (326)

Flights between 13k and 15k feet

330 / 10.6 / 0.6 ❌ (162)

Flights between 7k and 12k feet

291 / 9.4 / 0.6 ✔

Flights between 6k and 7k feet

9 / 0.3 / 0.0 ✔

Flights between 5k and 6k feet

7 / 0.2 / 0.0 ✔

Flights between 4k and 5k feet

10 / 0.3 / 0.0 ✔

Flights between 3k and 4k feet

42 / 1.4 / 0.1 ✔

Flights below 3k feet

3,137 / 101.2 / 6.0 ❌ (754)

4 or more flights per hour

464 / 15.0 ❌ (217)

9 or more flights per hour

269 / 8.7 ❌ (91)

Departures between 1.5k and 15k feet

517 / 16.7 / 1.0 ❌ (427)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

117 / 3.8

1 AM

117 / 3.8

2 AM

40 / 1.3

3 AM

23 / 0.7

4 AM

20 / 0.6

5 AM

28 / 0.9

6 AM

145 / 4.7

7 AM

407 / 13.1

8 AM to 9 PM

4,119 / 132.9 / 9.5

10 PM

268 / 8.6

11 PM

191 / 6.2

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

56 ❌ (43)

Minimum avg. distance in miles

0.71

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

129.0 / 72.0 / 6.8 ❌ (78)

Flight holding stack identified?

No

Altitude for all flights

9,831 ❌ (16,230)

Altitude of departures between 1.5k and 15k feet

10,712 ✔

Altitude of flights below 20k feet

4,390 ❌ (7,987)

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

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

21.40

Saturday @ 12:00 - 4 time(s) in 4 weeks. Approx:12 flight events.

16.40

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

16.10

Saturday @ 11:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

15.20

Monday @ 8:00 - 4 time(s) in 4 weeks. Approx:9 flight events.

15.00

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

12.10

Sunday @ 14:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.10

Sunday @ 12:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

10.80

Monday @ 15:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.70

Saturday @ 15:00 - 4 time(s) in 4 weeks. Approx:6 flight events.