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

28/06/2023 12:03:49

UK Postcode

NORTHCHURCH , HERTFORDSHIRE , HP4 1LB

Baseline geo-coordinates

51.7856 , -0.59636

Survey type

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

Assessment band

REGULAR

Assessment actual value

9.05

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

2,129 / 68.7 / 4.0 ✔

Flights above 26k feet.

382 / 12.3 / 0.7 ✔

Flights between 16k and 26k feet

621 / 20.0 / 1.2 ❌ (292)

Flights between 13k and 15k feet

207 / 6.7 / 0.4 ❌ (145)

Flights between 7k and 12k feet

554 / 17.9 / 1.1 ❌ (451)

Flights between 6k and 7k feet

148 / 4.8 / 0.3 ✔

Flights between 5k and 6k feet

97 / 3.1 / 0.2 ✔

Flights between 4k and 5k feet

65 / 2.1 / 0.1 ✔

Flights between 3k and 4k feet

9 / 0.3 / 0.0 ✔

Flights below 3k feet

46 / 1.5 / 0.1 ✔

4 or more flights per hour

204 / 6.6 ✔

9 or more flights per hour

20 / 0.6 ✔

Departures between 1.5k and 15k feet

742 / 23.9 / 1.4 ❌ (453)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

6 / 0.2

1 AM

12 / 0.4

2 AM

8 / 0.3

3 AM

5 / 0.2

4 AM

3 / 0.1

5 AM

5 / 0.2

6 AM

135 / 4.4

7 AM

160 / 5.2

8 AM to 9 PM

1,686 / 54.4 / 3.9

10 PM

53 / 1.7

11 PM

41 / 1.3

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

17 ✔

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

42 ❌ (41)

Minimum avg. distance in miles

0.43

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

41.0 / 17.0 / 2.2 ✔

Flight holding stack identified?

No

Altitude for all flights

16,722 ✔

Altitude of departures between 1.5k and 15k feet

9,133 ✔

Altitude of flights below 20k feet

11,140 ✔

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

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

8.70

Tuesday @ 19:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

7.10

Monday @ 8:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

6.80

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

6.20

Tuesday @ 15:00 - 4 time(s) in 4 weeks. Approx:4 flight events.

5.00

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

9.63

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

9.00

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

8.63

Wednesday @ 7:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

8.38

Monday @ 9:00 - 4 time(s) in 4 weeks. Approx:5 flight events.