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

12/02/2024 23:30:53

UK Postcode

HATFIELD-GARDEN-VILLAGE , HERTFORDSHIRE , AL6 9TX

Baseline geo-coordinates

51.8432 , -0.220657

Survey type

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

Assessment band

OCCASIONAL

Assessment actual value

4.46

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

740 / 23.9 / 1.4 ✔

Flights above 26k feet.

317 / 10.2 / 0.6 ✔

Flights between 16k and 26k feet

110 / 3.5 / 0.2 ✔

Flights between 13k and 15k feet

38 / 1.2 / 0.1 ✔

Flights between 7k and 12k feet

144 / 4.6 / 0.3 ✔

Flights between 6k and 7k feet

16 / 0.5 / 0.0 ✔

Flights between 5k and 6k feet

32 / 1.0 / 0.1 ✔

Flights between 4k and 5k feet

66 / 2.1 / 0.1 ✔

Flights between 3k and 4k feet

7 / 0.2 / 0.0 ✔

Flights below 3k feet

10 / 0.3 / 0.0 ✔

4 or more flights per hour

10 / 0.3 ✔

9 or more flights per hour

0 / 0.0 ✔

Departures between 1.5k and 15k feet

240 / 7.7 / 0.5 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

5 / 0.2

1 AM

7 / 0.2

2 AM

3 / 0.1

3 AM

11 / 0.4

4 AM

2 / 0.1

5 AM

4 / 0.1

6 AM

18 / 0.6

7 AM

61 / 2.0

8 AM to 9 PM

583 / 18.8 / 1.3

10 PM

28 / 0.9

11 PM

12 / 0.4

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

32 ✔

Minimum avg. distance in miles

0.47

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

5.0 / 2.0 / 0.3 ✔

Flight holding stack identified?

No

Altitude for all flights

22,236 ✔

Altitude of departures between 1.5k and 15k feet

8,603 ✔

Altitude of flights below 20k feet

9,095 ✔

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

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

5.33

Monday @ 7:00 - 3 time(s) in 4 weeks. Approx:3 flight events.

5.50

Wednesday @ 16:00 - 2 time(s) in 4 weeks. Approx:3 flight events.

3.75

Sunday @ 20:00 - 2 time(s) in 4 weeks. Approx:3 flight events.

3.50

Wednesday @ 14:00 - 2 time(s) in 4 weeks. Approx:2 flight events.

3.25

Sunday @ 13:00 - 2 time(s) in 4 weeks. Approx:2 flight events.

3.00

Friday @ 18:00 - 2 time(s) in 4 weeks. Approx:2 flight events.

2.75

Wednesday @ 9:00 - 2 time(s) in 4 weeks. Approx:2 flight events.