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

19/07/2022 15:15:40

UK Postcode

LETCHMORE-HEATH , HERTFORDSHIRE , WD25 8EW

Baseline geo-coordinates

51.6654 , -0.333609

Survey type

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

Assessment band

FREQUENT

Assessment actual value

12.23

Assessment description

Sound equates to an "A" road or a busy "B" road i.e. regular traffic that will be noticeable at peak times which includes evenings and weekends. Location is on a primary 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 between 4-10. Some of the flights will be below 7000 feet.

Band range

Lower: 12.0 --> Upper: 16.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

2,505 / 80.8 / 4.8 ✔

Flights above 26k feet.

364 / 11.7 / 0.7 ✔

Flights between 16k and 26k feet

109 / 3.5 / 0.2 ✔

Flights between 13k and 15k feet

59 / 1.9 / 0.1 ✔

Flights between 7k and 12k feet

982 / 31.7 / 1.9 ❌ (440)

Flights between 6k and 7k feet

272 / 8.8 / 0.5 ❌ (187)

Flights between 5k and 6k feet

141 / 4.5 / 0.3 ✔

Flights between 4k and 5k feet

45 / 1.5 / 0.1 ✔

Flights between 3k and 4k feet

51 / 1.6 / 0.1 ✔

Flights below 3k feet

482 / 15.5 / 0.9 ✔

4 or more flights per hour

203 / 6.5 ✔

9 or more flights per hour

56 / 1.8 ✔

Departures between 1.5k and 15k feet

359 / 11.6 / 0.7 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

13 / 0.4

1 AM

15 / 0.5

2 AM

17 / 0.5

3 AM

10 / 0.3

4 AM

10 / 0.3

5 AM

13 / 0.4

6 AM

92 / 3.0

7 AM

100 / 3.2

8 AM to 9 PM

1,765 / 56.9 / 4.1

10 PM

60 / 1.9

11 PM

31 / 1.0

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

21 ✔

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

43 ❌ (42)

Minimum avg. distance in miles

0.57

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

64.0 / 27.0 / 3.4 ✔

Flight holding stack identified?

No

Altitude for all flights

12,652 ❌ (15,914)

Altitude of departures between 1.5k and 15k feet

7,920 ✔

Altitude of flights below 20k feet

7,389 ❌ (7,967)

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

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

15.50

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

14.63

Monday @ 10:00 - 4 time(s) in 4 weeks. Approx:9 flight events.

14.13

Monday @ 12:00 - 4 time(s) in 4 weeks. Approx:9 flight events.

13.00

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

11.50

Monday @ 9:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.38

Sunday @ 12:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

10.63

Sunday @ 9:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

10.38

Monday @ 13:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

9.75

Sunday @ 14:00 - 4 time(s) in 4 weeks. Approx:6 flight events.