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

29/03/2022 19:00:14

UK Postcode

HARPENDEN-TOWN , HERTFORDSHIRE , AL5 2DU

Baseline geo-coordinates

51.8172 , -0.36639

Survey type

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

Assessment band

OCCASIONAL

Assessment actual value

6.90

Assessment description

Sound equates to a "C" road or an active country lane i.e. irregular traffic volumes. Location is on a flight route as opposed to a flight corridor. Some of the flights will be below 7000 feet and could occur at evenings and weekends.

Band range

Lower: 4.0 --> Upper: 7.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

1,655 / 53.4 / 3.1 ✔

Flights above 26k feet.

161 / 5.2 / 0.3 ✔

Flights between 16k and 26k feet

299 / 9.6 / 0.6 ❌ (292)

Flights between 13k and 15k feet

141 / 4.5 / 0.3 ✔

Flights between 7k and 12k feet

628 / 20.3 / 1.2 ❌ (451)

Flights between 6k and 7k feet

164 / 5.3 / 0.3 ✔

Flights between 5k and 6k feet

130 / 4.2 / 0.2 ✔

Flights between 4k and 5k feet

76 / 2.5 / 0.1 ✔

Flights between 3k and 4k feet

16 / 0.5 / 0.0 ✔

Flights below 3k feet

40 / 1.3 / 0.1 ✔

4 or more flights per hour

161 / 5.2 ✔

9 or more flights per hour

8 / 0.3 ✔

Departures between 1.5k and 15k feet

951 / 30.7 / 1.8 ❌ (453)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

5 / 0.2

1 AM

3 / 0.1

2 AM

4 / 0.1

3 AM

4 / 0.1

4 AM

3 / 0.1

5 AM

9 / 0.3

6 AM

93 / 3.0

7 AM

158 / 5.1

8 AM to 9 PM

1,306 / 42.1 / 3.0

10 PM

28 / 0.9

11 PM

22 / 0.7

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

18 ✔

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

41 ✔

Minimum avg. distance in miles

0.46

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

35.0 / 14.0 / 1.8 ✔

Flight holding stack identified?

No

Altitude for all flights

13,528 ❌ (15,884)

Altitude of departures between 1.5k and 15k feet

8,755 ✔

Altitude of flights below 20k feet

9,334 ✔

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

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

11.80

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

6.80

Tuesday @ 17:00 - 4 time(s) in 4 weeks. Approx:4 flight events.

6.20

Sunday @ 6:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

5.80

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

5.70

Tuesday @ 14:00 - 4 time(s) in 4 weeks. Approx:3 flight events.

12.88

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

10.38

Sunday @ 13:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

8.63

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