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

21/02/2024 09:50:05

UK Postcode

NORTHCHURCH , HERTFORDSHIRE , HP4 1LB

Baseline geo-coordinates

51.7856 , -0.59636

Survey type

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

Assessment band

REGULAR

Assessment actual value

10.16

Assessment description

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

Band range

Lower: 7.0 --> Upper: 12.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

3,103 / 100.1 / 5.9 ✔

Flights above 26k feet.

355 / 11.5 / 0.7 ✔

Flights between 16k and 26k feet

726 / 23.4 / 1.4 ❌ (309)

Flights between 13k and 15k feet

152 / 4.9 / 0.3 ❌ (135)

Flights between 7k and 12k feet

1,057 / 34.1 / 2.0 ❌ (431)

Flights between 6k and 7k feet

356 / 11.5 / 0.7 ❌ (182)

Flights between 5k and 6k feet

283 / 9.1 / 0.5 ❌ (280)

Flights between 4k and 5k feet

145 / 4.7 / 0.3 ✔

Flights between 3k and 4k feet

3 / 0.1 / 0.0 ✔

Flights below 3k feet

26 / 0.8 / 0.0 ✔

4 or more flights per hour

368 / 11.9 ❌ (203)

9 or more flights per hour

66 / 2.1 ✔

Departures between 1.5k and 15k feet

1,604 / 51.7 / 3.0 ❌ (380)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

10 / 0.3

1 AM

14 / 0.5

2 AM

10 / 0.3

3 AM

9 / 0.3

4 AM

16 / 0.5

5 AM

11 / 0.4

6 AM

207 / 6.7

7 AM

258 / 8.3

8 AM to 9 PM

2,455 / 79.2 / 5.7

10 PM

65 / 2.1

11 PM

39 / 1.3

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

43 ❌ (43)

Minimum avg. distance in miles

0.42

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

75.0 / 32.0 / 3.9 ❌ (72)

Flight holding stack identified?

No

Altitude for all flights

13,822 ❌ (16,202)

Altitude of departures between 1.5k and 15k feet

8,085 ✔

Altitude of flights below 20k feet

9,740 ✔

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

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

15.40

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

11.60

Thursday @ 18:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

11.40

Wednesday @ 12:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.30

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

11.20

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

10.30

Thursday @ 12:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.10

Friday @ 7:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

9.50

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

9.00

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