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

13/02/2025 16:31:30

UK Postcode

LEATHERHEAD-SOUTH , SURREY , KT22 7XL

Baseline geo-coordinates

51.2985 , -0.322357

Survey type

31 days prior to: 01-Sep-2024 @00:50:33

Assessment band

VERY HIGH

Assessment actual value

20.36

Assessment description

Highly likely to encounter both night-time and day-time noise disturbances that are caused by high volumes of planes flying at at low altitude. Also expect a visual impact too.

Band range

Lower: 20.0 --> Upper: 30.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

6,686 / 215.7 / 12.7 ❌ (3,197)

Flights above 26k feet.

739 / 23.8 / 1.4 ✔

Flights between 16k and 26k feet

132 / 4.3 / 0.3 ✔

Flights between 13k and 15k feet

86 / 2.8 / 0.2 ✔

Flights between 7k and 12k feet

2,576 / 83.1 / 4.9 ❌ (547)

Flights between 6k and 7k feet

1,670 / 53.9 / 3.2 ❌ (160)

Flights between 5k and 6k feet

1,274 / 41.1 / 2.4 ❌ (229)

Flights between 4k and 5k feet

3 / 0.1 / 0.0 ✔

Flights between 3k and 4k feet

1 / 0.0 / 0.0 ✔

Flights below 3k feet

205 / 6.6 / 0.4 ✔

4 or more flights per hour

517 / 16.7 ❌ (204)

9 or more flights per hour

356 / 11.5 ❌ (77)

Departures between 1.5k and 15k feet

1,716 / 55.4 / 3.3 ❌ (407)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

Between Midnight and 1am

24 / 0.8

Between 1am and 2am

18 / 0.6

Between 2am and 3am

15 / 0.5

Between 3am and 4am

14 / 0.5

Between 4am and 5am

9 / 0.3

Between 5am and 6am

97 / 3.1

Between 6am and 7am

242 / 7.8

Between 7am and 8am

406 / 13.1

Between 8am and 9pm

5,465 / 176.3 / 12.6

Between 10pm and 11pm

283 / 9.1

Between 11pm and Midnight

90 / 2.9

Other Noise Disturbance, Vibration and Emissions factors

Avg time in seconds an aircraft remained in the airspace bubble

51 ❌ (30)

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

48 ❌ (44)

Minimum avg. distance in miles

0.45

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

188.0 / 89.0 / 9.9 ❌ (68)

Flight holding stack identified?

Yes ❌

Altitude for all flights

10,723 ❌ (17,612)

Altitude of departures between 1.5k and 15k feet

7,076 ❌ (8,431)

Altitude of flights below 20k feet

7,639 ❌ (8,792)

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

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

27.00

Thursdays between 10:00 and 11:00 - 4 time(s) in 4 weeks. Approx:17 flight events.

26.80

Saturdays between 9:00 and 10:00- 4 time(s) in 4 weeks. Approx:17 flight events.

26.30

Thursdays between 9:00 and 10:00- 4 time(s) in 4 weeks. Approx:17 flight events.

24.50

Fridays between 11:00 and 12:00 - 4 time(s) in 4 weeks. Approx:15 flight events.

24.20

Saturdays between 10:00 and 11:00 - 4 time(s) in 4 weeks. Approx:15 flight events.

23.70

Fridays between 12:00 and 13:00 - 4 time(s) in 4 weeks. Approx:15 flight events.

23.00

Fridays between 7:00 and 8:00- 4 time(s) in 4 weeks. Approx:14 flight events.

22.70

Saturdays between 8:00 and 9:00- 4 time(s) in 4 weeks. Approx:15 flight events.

21.90

Wednesdays between 9:00 and 10:00- 4 time(s) in 4 weeks. Approx:14 flight events.