Caernarfon Bay North at Aberffraw Wastewater Treatment Works
This is a sewage discharge monitoring station, which is usually a type of Event Duration Monitor (EDM).
These stations themselves are designed to mitigate the impact of heavy rainfall by discharging, under permitted conditions, any overflow into a water body. They are often actively discharging during flood events.
This page presents the data acquired by the monitoring system for this discharge station.
These stations themselves are designed to mitigate the impact of heavy rainfall by discharging, under permitted conditions, any overflow into a water body. They are often actively discharging during flood events.
This page presents the data acquired by the monitoring system for this discharge station.
Operational Summary - 2021-2023
2936 hours | 11.17
The declared body of water receiving this discharge is the "Caernarfon Bay North"
This station has discharged sewage 507 time(s).
The station has discharged for a total of 2936 hour(s).
This is 11.17% of the time which we have data for.
In total: 122 day(s)* of elapsed time.
84 | 4204.8 hours
This monitor has been operational for 84% of its total time we have data for.
There are 4204.8 hours unaccounted for due to downtime of the monitor.
The worst year in our records for the "Aberffraw Wastewater Treatment Works" is 2021, discharging sewage for 2104.5 hours of the year.
Uptimes below 90% (red line) should be accompanied by a reason
*This is total time in days, not individual days.
Yearly Summary
Most Recent Year - 2023
Note: Data is potentially unreliable in 2023
Due to high unavailability of the monitor
Caernarfon Bay North | 219 Spills | Due to high unavailability of the monitor
266.2 hours | 3.03
The declared body of water receiving this discharge is the "Caernarfon Bay North"
This station discharged sewage 219 time(s) during 2023.
The station discharged for a total of 266.2 hour(s).
This is around 11 day(s)* or 3.03% of the year.
72 | 2445.7 hours
This monitor was operational for 72% of the year.
Leaving 2445.7 hours unaccounted for in the data.
This falls below the 90% threshold where a reason should be given
The following reasons have been given for the downtime in 2023:
Telemetry Or Data Archiving Failure / Issue
*This is total time in days, not individual days of the year.
Permit & Governance
| Attribute | Value |
|---|---|
| Governing Body | Natural Resources Wales |
| Operator | Dwr Cymru Welsh Water |
| Primary Permit # | CG0406301 |
| Secondary Permit # | CG0406301 |
2022
565.2 hours | 6.45
The declared body of water receiving this discharge is the "Caernarfon Bay North"
This station discharged sewage 185 time(s) during 2022.
The station discharged for a total of 565.2 hour(s).
This is around 23 day(s)* or 6.45% of the year.
80.1 | 1739.7 hours
This monitor was operational for 80.1% of the year.
Leaving 1739.7 hours unaccounted for in the data.
This falls below the 90% threshold where a reason should be given
The following reasons have been given for the downtime in 2022:
Telemetry Or Data Archiving Failure / Issue
*This is total time in days, not individual days of the year.
Permit & Governance
| Attribute | Value |
|---|---|
| Governing Body | Natural Resources Wales |
| Operator | Dwr Cymru Welsh Water |
| Primary Permit # | CG0406301 |
| Secondary Permit # | CG0406301 |
2021
2104.5 hours | 24.02
The declared body of water receiving this discharge is the "Aberffraw Bay"
This station discharged sewage 103 time(s) during 2021.
The station discharged for a total of 2104.5 hour(s).
This is around 87 day(s)* or 24.02% of the year.
100 | 0 hours
This monitor was operational for 100% of the year.
Leaving 0 hours unaccounted for in the data.
*This is total time in days, not individual days of the year.
Permit & Governance
| Attribute | Value |
|---|---|
| Governing Body | Natural Resources Wales |
| Operator | Dwr Cymru Welsh Water |
| Primary Permit # | CG0406301 |
| Secondary Permit # | CG0406301 |
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Local Information
Station Data Information
Station overseen (meaning either provided, or regulated) by: Natural Resources Wales
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Please note that FloodMapper does not verify or check the accuracy of the data provided by third parties. The data is used as received from the source. Any underlying errors, inconsistencies, or inaccuracies in the original data will be reflected in the information presented on our platform. Users are advised to exercise their own judgment and caution when using the data for decision-making purposes.
Information about our data sources and licenses can be found
The information displayed here is used under license. We are not affiliated with any governing, or other, bodies. Nor do they necessarily endorse us, or us them.
Please note that FloodMapper does not verify or check the accuracy of the data provided by third parties. The data is used as received from the source. Any underlying errors, inconsistencies, or inaccuracies in the original data will be reflected in the information presented on our platform. Users are advised to exercise their own judgment and caution when using the data for decision-making purposes.
Information about our data sources and licenses can be found
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